Terminal partial electrolysis shielding equipment and continuous terminal electrolysis equipment

Abstract

The present invention relates to the technical field of electrolytic surface treatment, and in particular to a terminal local electrolytic shielding device and a continuous terminal electrolytic device. A first conveyor belt is used to fully shield one side of a material belt, and a second conveyor belt is used to partially shield the other side of the material belt. A portion of the material belt extending out of the outer periphery of the second conveyor belt can be processed to achieve the purpose of local processing, thereby solving the problem that the existing equipment cannot effectively process a local portion of a single side of the material belt. A pulsed periodic reverse current is applied to the local surface of a continuous terminal material for electrolysis, and the electrolytic precious metal on the surface of the continuous terminal material is adjusted and controlled to have a desired precious metal film thickness that is uniformly distributed and has excellent corrosion resistance.

Description

Technical Field

[0001] The invention relates to the technical field of electrolytic surface treatment, in particular to a terminal local electrolytic shielding device and a continuous terminal electrolytic device. Background Art

[0002] Since the promotion and application of precious metal surface treatment technology in the electronics industry, it has been developing rapidly. In particular, gold-plated surface treatment technology and processes, because the gold-plated layer has good corrosion resistance, good ductility, solderability, electrical conductivity and thermal conductivity, and stable chemical properties, strong anti-discoloration ability, therefore, various gold-plated technologies and processes are now widely used in precision electronics industries such as smart phones, computers, automobiles, aerospace, and general civilian electronic products such as televisions and refrigerators, and are also widely used in processing fields such as decorations.

[0003] In order to make full use of the limited gold and other precious metal resources in nature, when performing precious metal surface electrolysis treatment on various electronic products with continuous metal terminals, it is only necessary to precipitate precious metals on the effective functional area of ​​the product. This requires that the precious metal electrolysis technology must meet the requirement that precious metals can only be precipitated locally on electronic products. Based on this special requirement of precious metal electrolysis technology, in the history of modern metal surface electrolysis treatment development, the research on precious metal electrolysis technology, especially gold electrolysis technology, has achieved unprecedented development, and many local electrolysis technologies have emerged.

[0004] The local electrolysis technology of precious metals includes the immersion method using the depth control of the surface treatment solution, the brush plating method controlling the local area, and the precious metal electrolysis technology using various masking methods for local surface treatment according to the shape and characteristics of the electrolytic products. It has been more widely developed and applied in recent years, and various methods and equipment for local electrolysis of precious metals have been gradually formed.

[0005] Patent document 1 (U.S. Patent No. 3,723,283) provides a surface treatment system for the production and processing of continuous terminals of strip electronic components. The system can continuously allow the strip terminal material to pass between two flexible strip gaskets, which are not driven by a motor but only idle. The gaskets are provided with spray holes according to product specifications, and there is an electrolytic solution spray inlet pipe in one gasket and an electrolytic solution outlet pipe in the other gasket, so that the electrolyte is kept in contact with other parts, and the electrolyte is between the strip terminal material to be electrolyzed and the separately arranged electrode, completing a local device that only electrolyzes the predetermined part of the terminal material, while the terminal material masked by the gasket is not electrolyzed on the surface. Although the gasket masking device improves the electrolysis efficiency of the terminal product by spraying the electrolytic solution onto the terminal material instead of the immersion method of the electrolytic solution; however, it is not suitable for the specific precious metal electrolytic solution of the present invention, that is, the specific precious metal electrolytic solution cannot be sprayed with the solution method, and can only be produced and processed by immersion electrolysis. In addition, the operation of the flexible belt gasket is not driven by a motor, and the stability and uniformity of operation cannot be maintained during long-term continuous production, so that the product quality cannot be guaranteed to be uniform, resulting in reduced production efficiency and increased production costs.

[0006] Patent document 2 (U.S. Patent No. 5,045,167) discloses a continuous electroplating device, including an annular carrier movable along a continuous path, a product plating area set at the first position along the carrier path, where a strip metal material is plated (spot-plated) by a precious metal solution sprayed from a plating nozzle. The annular carrier has at least one independently installed plating nozzle, including a storage tank for the plating solution, an anode is provided in the storage tank, and the anode makes the plating solution positively charged; and a shielded plating hole, through which the plating solution is sprayed to the negatively charged strip metal material, completing the continuous electroplating device in which only a designated single-side portion of the strip metal material is plated, and the shielded strip metal material is not plated.

[0007] Although the continuous device of the invention can perform partial coating on one side of a continuous metal strip to obtain a plated product of the product specifications; however, the equipment is complicated to manufacture, and has defects such as difficulty in management, difficulty in operation, difficulty in inspection, difficulty in adjustment, and difficulty in repair in daily production and equipment maintenance; in addition, the solution is supplied by a spraying method, which is not suitable for the specific precious metal electrolytic solution of the present invention, that is, the specific precious metal electrolytic solution cannot be supplied by the method of spraying the solution.

[0008] A method for electrolytic processing of a continuous terminal material described in patent document 3 (CN108779567A) includes the following steps: dividing the continuous terminal into a waste area (A), a contact area (B) and a non-contact area (C) distributed in sequence from the edge of the terminal material positioning hole to the center area. The waste area (A) is subjected to surface insulation treatment to make the waste area (A) lose its metal properties. The terminal material is immersed in a precious metal electrolytic solution to electrolytically process the terminal material. During the electrolytic processing, the waste area (A) that has been insulated cannot electrolytically deposit precious metals. The amount of precious metals used can be reduced, and costs can be reduced. However, this method is limited to the simultaneous electrolytic processing of both sides of the continuous terminal, and the requirements for local electrolytic processing of a single side cannot be met.

[0009] Patent document 4 (CN106329288A) discloses a terminal partial shielding method, in which the part of the terminal that does not need to be electroplated is treated with an insulating film; the terminal is placed in a plating tank, and electrolytic processing is performed on the terminal surface; then, the insulating film on the electrolytically processed terminal is removed to obtain a plated terminal product. The advantages of the present invention are that the electrolytic processing has high production efficiency and high product quality qualification rate.

[0010] However, in this method, the tape is required as a consumable, and since a tape attaching step and a tape removing step are required, the cost is higher than the cost of plating on the entire surface of the plating material. In addition, there may be a defect that the adhesive of the tape remains on the plating material after plating.

[0011] Patent document 5 (CN207596984U) This utility model discloses a terminal local continuous electroplating device, which is applied to the field of advanced manufacturing and automation technology, specifically the field of surface treatment technology. The device sets up an electrolytic solution tank by imitating the shape of the workpiece, and sets two layers of flow stabilizing plates inside the water upper seat, so that the contact between the electroplating solution and the workpiece tends to be stable when the electroplating solution reaches the workpiece placement tank, and the contact between the electroplating solution and the workpiece is stable, which improves the electroplating quality. At the same time, the open electrolytic solution tank can realize the continuous local selective electrolytic processing of the workpiece, improve the production efficiency, and solve the problem of the unstable liquid level of the electrolytic solution and the inaccurate local electrolysis area in the prior art, which leads to the decline of the quality of the electrolytic product and the increase of the production cost of the product.

[0012] However, the electrolytic products produced by this method have uneven distribution of electrolytic metal film thickness due to the use of direct current power supply for electrolytic production, and the excess precious metal electrolyzed at the end of the product cannot be saved.

[0013] Patent document 6 (Japanese Patent No. JP1995-268680A) provides a local electroplating device for selectively electroplating a single-sided local area of ​​the top portion of an arc-shaped workpiece, which is aligned and supported in parallel at a predetermined spacing. A pair of mask members are used to mask a large number of needle-shaped workpieces from both sides, thereby leaving a surface of the tip portion, and electroplating is performed so that the plating liquid contacts a single-sided local area of ​​the top portion exposed from the mask member. In addition, in a processing mechanism, one mask cover of a pair of mask members has a plurality of grooves for the arc-shaped workpiece to be engaged, and the other mask member has a plurality of protrusions engaged with the grooves. A pair of mask members are configured to sandwich the arc-shaped workpiece with the grooves and protrusions, and expose a surface of the top portion of the arc-shaped workpiece to the characteristics of the other mask member.

[0014] However, the equipment is complex to manufacture, and has defects such as difficulty in management, difficulty in operation, difficulty in inspection, difficulty in adjustment, and difficulty in repair during daily production and equipment maintenance.

[0015] Patent document 7 (Japanese Patent JP No. 3461832B2) provides a device for electrolytically treating a continuous terminal material passing through an electrolytic processing area of ​​a device, wherein the terminal material is in contact with an electrolytic solution, and the device for conveying is in contact with the electrolytic solution only in the limited area. A masking device for masking the terminal material, a conveying device with an endless chain is provided for aligning and positioning the terminal material with the masking device, and the device is masked. A continuously moving conductive processing material, a device for supplying electrolyte to the processing material to pass current between the processing material as one electrode and the processing material as another electrode. The device can be used to selectively electrolytically treat the function of a limited area.

[0016] However, the equipment also has the problems of being complex to manufacture and difficult to maintain.

[0017] Patent document 8 (Japanese Patent JP2018-165378A) provides a method of providing a plurality of rows of openings in the vertical direction of a mask member, and when a plating solution is sprayed from each opening in the lateral direction, when the plating solution sprayed to the opening of the row falls due to the action of gravity, it interferes with the spraying of the plating solution sprayed from the top to the openings of the second row and subsequent rows, so that the metal material is exposed at the opening. It is found that the plating solution stays near the surface and the metal ions are not fully supplied. Therefore, by making the openings of the second row and subsequent rows from the top have a structure that does not limit the residual plating solution, it is possible to prevent partial plating from being scorched and discolored and obtain a good plating layer in the area of ​​local plating.

[0018] This electrolysis technology has been widely used in production and processing equipment, and is suitable for the application of single-sided local electrolysis products. In most cases, it can replace the electrolytic processing methods of ring carriers (References 1, 2, 6, 7) and film masking (References 4, 5). However, the above method cannot be applied to precious metal alloy solutions that cannot be sprayed.

[0019] Non-patent literature, China Materials Science and Equipment, 2009, No. 1, pp75. A nitric acid exposure test method is provided for connector terminal surface gold-plated products. Concentrated nitric acid is placed in a sealed container glass desiccator. The test sample is placed above the nitric acid solution under specified conditions. The cover is placed on the container to form a closed system. The evaporated nitrogen dioxide gas fills the sealed container to evaluate the corrosion resistance of the product.

[0020] The various local electrolysis equipments described in Patent Documents 1 to 8 provide surface treatment methods for continuous metal terminals with various complex requirements for local surface electrolysis of precious metals. However, the precious metal alloy electrolytic solution to be discussed in the present invention cannot be sprayed, but can only be immersed in the electrolysis method. Therefore, the electrolysis techniques provided in the above documents 1 to 8 cannot obtain satisfactory results.

[0021] In addition, the principle of metal precipitation of all local electrolytic treatment equipment is to spray the precious metal solution onto the surface of the continuous metal terminal through a narrow slit to obtain the electrolytic treatment product. The spray intensity and uniformity of the direction of the precious metal solution directly affect the uniformity of the electrolytic precious metal distribution of the precious metal surface treatment and the performance and surface quality of the precipitated metal. In the long-term continuous surface treatment production process, it is very difficult to maintain the uniformity of the spray intensity and direction of the precious metal solution. Therefore, the uneven distribution of the precious metal film thickness leads to an increase in the use of precious metals, and the defects such as insufficient corrosion resistance of the electrolytic precious metal surface require the development of more effective electrolytic methods and electrolytic equipment.

[0022] The uneven distribution of the thickness of the precious metal film refers to the problem that in the method of locally electrolyzing a continuous metal terminal material using a masking tape in patent documents 1 to 8, the thickness of the electrolytic film obtained at the interface between the non-electrolysis area of ​​the terminal material and the electrolysis area of ​​the terminal material (the part near the masking tape) is relatively low, while the thickness of the electrolytic film at the tip and corner of the terminal material is relatively high.

[0023] For precious metal alloy electrolytic solutions that cannot be sprayed, obtaining local electrolytic products is limited to the method of immersing the precious metal electrolytic solution. Therefore, the methods described in Patent Documents 1 to 8 have the following problems:

[0024] 1) For precious metal alloy electrolytic solutions that cannot be treated by spraying for surface electrolysis, the existing technology cannot meet the product specification requirements; 2) The thickness distribution of the precious metal film is uneven when the continuous terminal material is treated by single-sided electrolysis; 3) The corrosion resistance of the continuous terminal electrolytic precious metal products is insufficient; 4) When the local surface electrolysis is treated, there are defects such as leakage and leakage electrolysis to precipitate precious metals. Summary of the invention

[0025] The technical problem to be solved by the present invention is: in order to solve the technical problems of complex structure, low efficiency, high maintenance cost and uneven distribution of precious metal film thickness during surface treatment of continuous terminal materials in the local electrolysis equipment in the prior art, the present invention provides a terminal local electrolysis shielding device and a continuous terminal electrolysis device.

[0026] The technical solution adopted by the present invention to solve its technical problems is: a terminal local electrolytic masking device, which is used for surface treatment of materials. The materials are made of metal and include a local electrolytic masking jig. The local electrolytic masking jig includes: a first masking belt and a second masking belt. The second masking belt is arranged on one side of the first masking belt and is consistent with the conveying direction of the first masking belt. A channel extending along the conveying direction is formed between the second masking belt and the first masking belt. The material passes through the channel. The length direction of the material is consistent with the conveying direction of the belt. The material is clamped between the first masking belt and the second masking belt. The orthographic projection of the material on the first masking belt is located in the first masking belt. The orthographic projection of the second masking belt on the material is located in the material, so that a part of the material is exposed from the outer periphery of the second masking belt. The terminal local electrolysis shielding equipment of the present invention fully shields one side of the material belt by the first conveyor belt, and partially shields the other side of the material belt by the second conveyor belt. A part of the outer periphery of the material belt extending out of the second conveyor belt can be processed to achieve the purpose of local processing, which solves the problem that the existing equipment cannot effectively process the local part of a single side of the material belt. It has the advantages of high degree of mechanization, simple structure, easy use, no pollution, low cost and high efficiency.

[0027] Further, specifically, the width of the first masking belt is not less than the width of the material, and the width of the second masking belt is less than the width of the material.

[0028] Further, specifically, a first tension control component is arranged in the first masking belt, and the first tension control component includes a tensioning wheel and a first transmission wheel, and the tensioning wheel and the first transmission wheel constitute a motion circuit of the first masking belt; a second tension control component is arranged in the second masking belt, and the second tension control component includes a tensioning wheel and a second transmission wheel, and the tensioning wheel and the second transmission wheel constitute a motion circuit of the second masking belt.

[0029] Further, specifically, the first transmission wheel is connected to the second gear, the second transmission wheel is connected to the third gear, the second gear and the third gear are meshed, the second gear is also meshed with the speed regulating gear, and the speed regulating gear is transmission-connected to the rotating shaft of the motor.

[0030] Further, specifically, the terminal partial electrolysis shielding device also includes a belt guide rail, which is slidably connected to the first masking belt or the second masking belt to limit the movement trajectory of the corresponding first masking belt or the second masking belt.

[0031] Further, specifically, the local electrolytic masking jig also includes an electrolytic device, the local electrolytic masking jig is arranged in the electrolytic device, the material passes through the electrolytic device, a containing chamber filled with electroplating liquid is defined in the electrolytic device, the material is located in the containing chamber and a portion of the material extending out of the outer periphery of the second conveyor belt is in contact with the electroplating liquid, the electrolytic device is connected to a pulse reverse power supply, and the current output by the pulse reverse power supply and applied near the material undergoes periodic changes; when a forward pulse current is applied, a metal film is electrolytically deposited on the material, presenting a pulse forward waveform; when a reverse pulse current is applied after the periodic change, the metal film on the material is electrolytically stripped, presenting a pulse reverse waveform. The terminal local electrolysis shielding device of the present invention applies a pulse periodic reverse current to the local surface of the continuous terminal material for electrolysis, and adjusts and controls the electrolytic precious metal on the surface of the continuous terminal material to a desired precious metal film with uniform thickness distribution and excellent corrosion resistance; the adjustment and control of the local surface of the continuous terminal material is achieved through the local electrolysis device and method of the transmission motor precision adjustment system, the tension control component between the material and the endless shielding belt, and the electric device to transmit the endless shielding belt; the continuous terminal product quality qualification rate is improved, a large amount of precious metal usage is saved, and the production cost of the electrolytic precious metal is greatly reduced.

[0032] Further, specifically, an electrolytic anode plate is also provided in the electrolytic device, and a portion of the electrolytic anode plate extends out toward the material from the outer periphery of the second conveyor belt, and the electrolytic anode plate is connected to the anode output connector of the pulse reverse power supply. A cathode conductive wheel is connected to the portion of the material that passes through the first masking belt and the second masking belt in the extension direction, and the cathode conductive wheel is connected to the cathode output connector of the pulse reverse power supply.

[0033] Further, specifically, the local electrolysis masking jig also includes a substrate, the electrolysis device includes an inner sub-trough with an opening, the substrate is fixedly mounted in the inner sub-trough by a bracket, and the first masking belt and the second masking belt are located below the substrate.

[0034] Further, specifically, the electrolysis device also includes a mother tank for containing electroplating solution, the mother tank and the inner sub-tank are interconnected through a solution delivery pipe, a solution delivery pump is provided on the solution delivery pipe, and a reflux pipe is also connected between the mother tank and the inner sub-tank.

[0035] Furthermore, in order to ensure the linear transmission of the material, through holes are opened at both ends of the inner sub-groove, and the material passes through the through holes, and pairs of limiting and guiding fixtures are arranged on the outside of the inner sub-groove near the through holes, and the material is clamped between each pair of limiting and guiding fixtures.

[0036] A continuous terminal electrolysis device comprises a plurality of terminal local electrolysis shielding devices, wherein the plurality of terminal local electrolysis shielding devices are arranged side by side and spaced from front to back, and the material passes between the first masking belt and the second masking belt of each terminal local electrolysis shielding device.

[0037] The beneficial effect of the present invention is that the terminal local electrolysis shielding equipment and the continuous terminal electrolysis equipment of the present invention fully shield one side of the material belt by the first conveyor belt, and partially shield the other side of the material belt by the second conveyor belt. A part of the outer periphery of the material belt extending out of the second conveyor belt can be processed to achieve the purpose of local processing, which solves the problem that the existing equipment cannot effectively process the local part of a single side of the material belt. It has the advantages of high degree of mechanization, simple structure, easy use, pollution-free, low cost and high efficiency.

[0038] Since there is a dead angle of liquid flow near the second conveyor belt on the material, the liquid fluidity is weak and the metal ions obtained are few, so the metal film on the material near the second conveyor belt is relatively thin, while the liquid fluidity is strong at the material away from the second conveyor belt, and the metal ions obtained are more, so the metal film on the material away from the second conveyor belt is relatively thick, resulting in uneven thickness of the metal film plating on the material. A pulse reverse power supply is provided, which can electrolyze metal ions when the surface of the material is a negative electrode, and form a metal film on the surface of the material. Then, the pulse reverse power supply converts the material into an anode. At this time, the metal film on the surface of the material is electrolytically stripped under the action of the anode, and the ions at the thick film position are more stripped, and the ions at the thin film position are less stripped, so that the required precious metal film thickness is evenly distributed and has excellent corrosion resistance; the adjustment and control of the local surface of the continuous terminal material is achieved through the transmission motor precision adjustment system, the tension control component between the material and the annular shielding belt, and the local electrolysis equipment and method of the electric device transmitting the annular shielding belt; the continuous terminal product quality qualification rate is improved, a large amount of precious metal usage is saved, and the production cost of electrolytic precious metals is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0040] Figure 1 It is a schematic plan view of a continuous terminal electrolysis device according to an embodiment of the present invention;

[0041] Figure 2 It is a schematic enlarged plan view of a local electrolysis shielding device according to an embodiment of the present invention;

[0042] Figure 3 It is a perspective schematic diagram of the front side of a partial electrolysis shielding device according to an embodiment of the present invention;

[0043] Figure 4 It is a three-dimensional schematic diagram of the reverse side of the local electrolysis shielding device according to an embodiment of the present invention;

[0044] Figure 5 A three-dimensional diagram of an electrolytic masking fixture according to an embodiment of the present invention;

[0045] Figure 6 A bottom view of an electrolytic masking jig according to an embodiment of the present invention;

[0046] Figure 7 A three-dimensional schematic diagram of the motor power components of the electrolytic masking fixture according to an embodiment of the present invention;

[0047] Figure 8 It is a three-dimensional schematic diagram of the tensioning wheel composition of the electrolytic masking fixture according to an embodiment of the present invention;

[0048] Fig. 9 Schematic diagram of pulse waveform and electrolytic film thickness distribution of pulse reverse electrolysis according to an embodiment of the present invention;

[0049] Fig.10 A schematic diagram of an asymmetric AC waveform and electrolytic film thickness distribution in an embodiment of the present invention;

[0050] Fig.11 The terminal plane diagram of the embodiment of the present invention and Figure 8 and Fig. 9 Schematic diagram of superposition;

[0051] Fig.12 The terminal cross-sectional view of Example 1 of the present invention and Comparative Experiment 1;

[0052] Fig.13 This is a schematic diagram of the terminal plane of Embodiment 1 of the present invention;

[0053] Fig.14 is the terminal film thickness measurement point of embodiment 1 of the present invention;

[0054] Fig.15 This is a schematic diagram of the terminal plane of embodiment 2 of the present invention;

[0055] Fig.16This is the terminal film thickness measurement point of Example 2 of the present invention, and an enlarged view of the noble metal electrolysis area;

[0056] Fig.17 The nitric acid exposure test results of the product with gold plated terminal surface according to Example 1 of the present invention, the test results of sample 1;

[0057] Fig.18 The nitric acid exposure test results of the product with gold plated terminal surface according to Example 2 of the present invention, the test results of Sample 2;

[0058] Fig.19 The nitric acid exposure test results of the product with gold plated on the terminal surface of Example 3 of the present invention, the test results of Sample 3;

[0059] Fig. 20 The corrosion rate results of samples 1, 2 and 3 after nitric acid exposure test in the embodiments of the present invention are shown;

[0060] In the figure: continuous terminal electrolysis equipment 1000; terminal local electrolysis shielding equipment 510;

[0061] Electrolysis masking device 300; outer sub-tank 310; inner sub-tank 320; cathode conductive wheel 1 330a, cathode conductive wheel 2 330b; electrolysis anode 1 340a, electrolysis anode 2 340b; inlet limit guide fixture 350a, outlet limit guide fixture 350b; mother tank 360; solution delivery pump 370; solution delivery pipeline 380; solution reflux pipeline 390;

[0062] Pulse reverse power supply 200; forward pulse current setting 210; reverse pulse current setting 220; forward pulse time setting 230; reverse pulse time setting 240; anode output connector 250; cathode output connector 260;

[0063] Electrolytic masking jig 100; first masking belt 10; second masking belt 20; belt guide rail 21; material 30; speed regulating gear 40; second gear 41; third gear 42; first transmission wheel 43; second transmission wheel 44; tension wheel 45; bearing 46; screw 47; nut 48;

[0064] Motor 50; motor seat 51; coupling 52; rotating shaft 53; transmission flange 54; flange seat 55;

[0065] Reducer 60; base plate 70; bracket 80; leveling foot 81. DETAILED DESCRIPTION

[0066] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0067] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0068] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] like Figure 1-3 As shown, it is an embodiment of the present invention, a continuous terminal electrolysis device 1000 includes a plurality of terminal local electrolysis shielding devices 510, wherein one terminal local electrolysis shielding device 510 includes: a local electrolysis masking device 300 and a pulse reverse power supply 200 (also called a pulse reverse power supply or a pulse reverse rectifier).

[0070] Specifically, the local electrolytic masking device includes a sub-tank 310 , an inner sub-tank 320 , an electrolytic masking fixture 100 , a main tank 360 , an electrolytic solution delivery pump 370 , a solution delivery pipeline 380 and a solution reflux pipeline 390 .

[0071] like Figure 5 and 6As shown, the local electrolysis masking jig 100 includes: a first masking belt 10 and a second masking belt 20. Specifically, the second masking belt 20 is arranged on one side of the first masking belt 10 and is consistent with the conveying direction of the first masking belt 10, and a channel extending along the conveying direction is formed between the second masking belt 20 and the first masking belt 10, and a material 30 to be processed extending along its conveying direction is passed through the channel, and the orthographic projection of the material 30 on the first masking belt 10 is located in the first masking belt 10, and the orthographic projection of the second masking belt 20 on the material 30 is located in the material 30, and a part of the material 30 is exposed from the outer periphery of the second masking belt 20.

[0072] In other words, the local electrolysis masking jig 100 according to the embodiment of the present invention is mainly composed of a first masking belt 10 and a second masking belt 20. The first masking belt 10 can be arranged on one side of the second masking belt 20 and spaced apart from it and arranged opposite to it. There is a channel between the first masking belt 10 and the second masking belt 20. When in use, the long strip-shaped material 30 to be processed can be placed in the channel. Since the conveying directions of the first masking belt 10 and the second masking belt 20 are consistent, under the action of the first masking belt 10 and the second masking belt 20, the material 30 clamped in the channel moves along the same conveying direction, with a high degree of automation, which can achieve uninterrupted processing and production, improve processing and production efficiency, and reduce costs.

[0073] In addition, the orthographic projection of the continuous terminal material 30 on the first masking belt 10 is located inside the first masking belt 10, the orthographic projection of the second masking belt 20 on the material 30 is located inside the material 30, and a portion of the material 30 is exposed from the outer periphery of the second masking belt 20, that is, the material 30 is provided with a shielding surface on one side adjacent to the first masking belt 10 in the horizontal direction, and the material 30 is provided with a surface to be processed on one side adjacent to the second masking belt 20 in the horizontal direction. The first masking belt 10 needs to fully shield the shielding surface of the material 30, and the second masking belt 20 needs to partially shield the surface to be processed of the material 30. For example, when the first masking belt 10 and the second masking belt 20 are transported in the horizontal direction, and the first masking belt 10, the second masking belt 20 and the continuous terminal material 30 extend in the vertical direction respectively, the size of the first masking belt 10 in the width direction can be greater than or equal to the size of the shielding surface in the width direction.

[0074] It should be noted that the second masking belt 20 can have various sizes along the width direction, but the relationship between the second masking belt 20 and the material 30 needs to satisfy the purpose of partially exposing the surface to be processed, so that the exposed surface to be processed can be partially processed. When the upper end of the second masking belt 20 is level with the upper end of the surface to be processed, the width of the second masking belt 20 is smaller than the width of the surface to be processed. When the upper end of the second masking belt 20 is higher than the upper end of the surface to be processed, the lower end of the surface to be processed exposes the outer periphery of the lower end of the second masking belt 20. When the lower end of the second masking belt 20 is level with the lower end of the surface to be processed, the upper end of the surface to be processed exposes the outer periphery of the upper end of the second masking belt 20. When the upper end or the lower end of the second masking belt 20 is not level with the upper end or the lower end of the surface to be processed, it is only necessary to satisfy that the second masking belt 20 and the surface to be processed have a partial overlapping surface, and part of the surface to be processed is not shielded.

[0075] Therefore, according to the local electrolysis masking jig 100 of the embodiment of the present invention, the masking surface of the material 30 is fully masked by the first masking belt 10, and the second masking belt 20 partially masks the surface to be processed of the material 30. A portion of the outer periphery of the material 30 exposed from the second masking belt 20 can be processed to achieve the purpose of local processing, which solves the problem that the existing equipment cannot effectively process the local part of the material 30, and has the advantages of high degree of mechanization, simple structure, easy use, no pollution, low cost, high efficiency, etc.

[0076] According to one embodiment of the present invention, the width of the first masking belt 10 is not less than the width of the continuous terminal material 30, and the width of the second masking belt 20 is less than the width of the material 30. That is, when the material 30 passes through the channel, the shielding surface of the material 30 is fully shielded by the first masking belt 10, and the surface to be processed of the material 30 is partially shielded by the second masking belt 20, so that the portion of the material 30 exposed from the outer periphery of the second masking belt 20 can be locally processed.

[0077] In some specific embodiments of the present invention, the two sides of the material 30 are respectively stopped against the first masking belt 10 and the second masking belt 20, which can clamp the material 30, which can not only ensure the airtightness of the area of ​​the material 30 that does not need to be processed, but also prevent the material 30 from shifting and falling off during the processing.

[0078] According to one embodiment of the present invention, the local electrolysis masking jig 100 further includes a tension control component, which is respectively connected to the first masking belt 10 and the second masking belt 20 to control the first masking belt 10 and the second masking belt 20 to run synchronously while reducing the tension between the two belts and the material.

[0079] Optionally, the tension control component includes: a transmission wheel, a rotating shaft 53 and a speed regulating gear 40, the rotating wheel is connected to the first masking belt 10 or the second masking belt 20, the rotating shaft 53 is connected to the transmission wheel, and the speed regulating gear 40 is connected to the transmission wheel through the rotating shaft 53 and adjusts the rotation rate of the transmission wheel, thereby regulating the first masking belt 10 and the second masking belt 20 to run synchronously while reducing the tension between the two belts and the material.

[0080] Preferably, the first masking belt 10 and the second masking belt 20 are endless masking belts, which have the advantages of easy processing, wide source, low price, small space occupation, etc.

[0081] According to one embodiment of the present invention, the local electrolysis masking jig 100 further includes a belt guide rail, which is slidably connected to the first masking belt 10 or the second masking belt 20 to define a movement trajectory of the corresponding first masking belt 10 or the second masking belt 20 .

[0082] The following describes in detail the assembly process and assembly features of the local electrolysis masking jig 100 according to an embodiment of the present invention.

[0083] like Figure 7 and Figure 8 As shown, the reducer 60 and the motor 50 constitute the motor power component, which is installed on the motor base 51. A hole is left in the middle of the motor base 51, and the power is transmitted to the speed regulating gear 40 through the coupling 52, the motor rotating shaft 53, and the transmission flange 54.

[0084] The transmission flange 54 is mounted on the flange seat 55, the speed regulating gear 40, the second gear 41, and the third gear 42 are meshed, the second gear 41 and the third gear 42 are connected to the first transmission wheel 43 and the second transmission wheel 44 respectively, wherein the first transmission wheel 43 is connected to the first masking belt 10, and the second transmission wheel 44 is connected to the second masking belt 20, the speed regulating gear 40 is connected to the transmission wheel through the rotating shaft 53 and adjusts the rotation rate of the transmission wheel to drive the operation of the conveyor belt. The first transmission wheel 43 and the three tensioning wheels 45 constitute the motion circuit of the first masking belt 10.

[0085] The tensioning wheel 45 cooperates with the bearing 46 , and is fixed to one end of the tensioning wheel 45 by a screw 47 , and the other end is fixed to the base plate 70 by a hexagonal nut 48 . The second transmission wheel 44 and the three tensioning wheels 45 form a motion loop of the second masking belt 20 .

[0086] A belt guide 21 is also provided on the lower surface of the base plate 70, and the belt guide 21 is slidably connected to the first masking belt 10 or the second masking belt 20 to limit the movement trajectory of the corresponding first masking belt 10 or the second masking belt 20. The first masking belt 10 and the second masking belt 20 are contacted with the material 30 by the belt guide 21 to ensure that the material 30 is clamped and the shielding effect is achieved.

[0087] The following describes in detail the matching process and assembly features of the local electrolysis device 500 according to an embodiment of the present invention.

[0088] like Figure 3 and 4 As shown, Figure 3 The local electrolysis masking fixture 100 is set in the inner sub-slot 320, and the local electrolysis masking device 300 is assembled. Figure 4 The local electrolysis masking fixture 100 has the advantages of simple structure, easy assembly and disassembly, simple use, low equipment cost and high efficiency.

[0089] like Figure 1 As shown, the terminal local electrolysis shielding device 510 of the embodiment of the present invention includes: a local electrolysis shielding device 300 and a pulse reverse power supply 200. The specific matching and assembly steps are as follows:

[0090] The anode output end 250 of the pulse reverse power supply 200 is connected to the electrolytic anode plate 1 340a and the electrolytic anode plate 2 340b of the local electrolytic masking device 300 by a dedicated coaxial cable; the electrolytic anode plate 1 340a and the electrolytic anode plate 2 340b are located below the base 70 and are arranged oppositely, and the electrolytic anode plate 1 340a and the electrolytic anode plate 2 340b are located on both sides of the material 30 and do not contact the material 30. In addition, the cathode output end 260 of the pulse reverse power supply 200 is connected to the cathode conductive wheel 1 330a and the cathode conductive wheel 1 330b of the local masking electrolytic device 300 by a dedicated coaxial cable. Through the electrolytic process unit of the local masking electrolytic equipment 510, the continuous terminal material 30 can be locally electrolytically masked for production and processing; according to the thickness specification of the precious metal coating of the continuous terminal material 30, the terminal local electrolytic shielding equipment 510 with 3 to 9 units can be selected to meet the production and processing requirements.

[0091] The material 30 can be any single substance selected from copper, nickel, cobalt, tungsten, molybdenum, chromium and zinc, or an alloy composed of any two or more selected from copper, nickel, cobalt, phosphorus, tungsten, arsenic, molybdenum, chromium and zinc; it can also be iron and its iron alloy, or various stainless steel materials; all the metal materials can be continuous strips or continuous lead frame materials. In addition, all materials with metal foil on the surface can be processed by local surface electrolysis through the manufacturing method and manufacturing equipment of the present invention; for example, materials with metal foil on one or both sides of various plastic films can manufacture the required local electrolytic precious metal products.

[0092] The optional width range of the material 30 is 7mm to 80mm, preferably 8mm to 70mm, and more preferably 9mm to 55mm; the optional thickness range of the material 30 is 0.06mm to 0.30mm, preferably 0.07mm to 0.25mm, and more preferably 0.09mm to 0.20mm.

[0093] The first masking belt 10 may have a width ranging from 6 mm to 100 mm, preferably ranging from 7 mm to 90 mm, and more preferably ranging from 8 mm to 80 mm. The masking belt may have a thickness ranging from 0.6 mm to 8 mm.

[0094] The second masking belt 20 may have a width ranging from 6 mm to 100 mm, preferably ranging from 6 mm to 70 mm, and more preferably ranging from 6 mm to 50 mm. The masking belt may have a thickness ranging from 0.6 mm to 8 mm.

[0095] The optional height range of the electrolytic processing of the local surface of the precious metal of the material 30 is 0.5 mm to 10 mm, preferably 0.5 mm to 7 mm, and more preferably 0.5 mm to 5 mm.

[0096] The specific steps of the method for setting the pulse forward and reverse current output by the pulse reverse power supply 200 are as follows:

[0097] (1) The pulse periodic forward current density of electrolyzed precious metal solution can be selected in the range of 0.5A / dm 2 ~10A / dm 2 , the preferred range is 0.6A / dm 2 ~7A / dm 2 , the preferred range is 0.7A / dm 2 ~5A / dm 2 ; Pulse periodic reverse current density optional range 5A / dm 2 ~50A / dm 2 , the preferred range is 7A / dm 2 ~30A / dm 2 , more preferably in the range of 9A / dm 2~20A / dm 2 .

[0098] (2) The pulse periodic forward current output by the pulse periodic reverse power supply can be in the range of 0.5A to 20A, preferably in the range of 0.5A to 17A, and preferably in the range of 0.5A to 15A; the pulse periodic reverse current can be in the range of 5A to 100A, preferably in the range of 5A to 80A, and preferably in the range of 5A to 70A.

[0099] (3) The forward pulse time of the pulse periodic reverse power supply output can be selected in the range of 5ms to 50ms, preferably in the range of 5ms to 40ms, and more preferably in the range of 5ms to 30ms; the reverse pulse time of the pulse reverse power supply output can be selected in the range of 1ms to 20ms, preferably in the range of 1ms to 15ms, and more preferably in the range of 1ms to 10ms.

[0100] (4) The output current of the pulse periodic reverse power supply can be calculated according to the following formula: The output current of the pulse periodic reverse power supply A = the current density of the electrolytic precious metal solution A / dm 2 × Material surface area dm 2 ;

[0101] The terminal local electrolysis shielding device 510 for regulating and controlling the local surface electrolysis continuous terminal product by pulse periodic reverse electrolysis technology is composed of a pulse reverse power supply 200 and a local electrolysis masking device 300.

[0102] The optional number of terminal local electrolysis shielding devices 510 is 3 to 9 units, preferably in the range of 3 to 7 units, and more preferably in the range of 3 to 5 units.

[0103] The output current of the optional pulse periodic reverse power supply of each electrolysis process equipment unit is adjusted and controlled to be different. At the same time, the output pulse time of the optional pulse periodic reverse power supply of each electrolysis process equipment unit is also adjusted and controlled to be different. Through various arrangements and combinations of units with different set conditions, a test plan for local surface electrolysis continuous terminal products is designed and the experimental results are optimized. The best experimental method for local surface electrolysis continuous terminals is selected, and the local electrolysis equipment and method for continuous terminal products required for the production requirements of continuous terminal products are obtained.

[0104] The amount of precious metals saved by the local electrolysis equipment and method can be calculated according to the following formula:

[0105] Precious metal saving amount grams (G) = pulse periodic reverse wave (G) - asymmetric alternating wave (G)

[0106] The electrolysis method of the continuous terminal has the following steps:

[0107] S1: clamp the material 30 between the first masking belt 10 and the second masking belt 20, so that the material 30 moves forward along the channel conveying direction, one side of the material 30 is completely shielded by the first masking belt 10 and does not contact with the electroplating solution, the other side of the material 30 is partially shielded by the second masking belt 20, the exposed part of the other side of the material 30 contacts with the electroplating solution, and the metal film is electroplated on the exposed part of the other side of the material 30;

[0108] S2: The current output by the pulse reverse power supply 200 and applied near the material 30 changes periodically;

[0109] When a forward pulse current is applied, a metal film is electrolytically deposited on the material 30, presenting a pulse forward waveform; when a reverse pulse current is applied after a periodic change, the metal film on the material 30 is electrolytically stripped, presenting a pulse reverse waveform.

[0110] S3: The material 30 passes between the first masking belt 10 and the second masking belt 20 of the multiple terminal local electrolysis shielding equipment, and finally a uniform metal film is obtained on the exposed part of the other side of the material 30.

[0111] Therefore, the terminal local electrolysis shielding device 510 according to the embodiment of the present invention has at least the following advantages:

[0112] (1) Providing power can make the equipment operate, and while transporting the material, it can also continuously perform local masking electrolytic precious metal processing.

[0113] (2) It can realize mechanized local processing without human interference, and the electrolytic processing quality is high.

[0114] (3) The production and processing efficiency can be improved by increasing the number of terminal local electrolytic shielding devices 510.

[0115] The terminal local electrolysis shielding device 510 according to an embodiment of the present invention includes the local electrolysis masking jig 100 of any one of the above embodiments.

[0116] In a specific embodiment of the present invention, the local electrolytic masking device 300 further includes an electrolytic inner sub-tank 320, wherein a receiving chamber filled with an electrolytic solution is defined in the electrolytic inner sub-tank 320, wherein the material 30 is located in the receiving chamber and the portion of the material 30 that is exposed from the outer periphery of the second shielding belt 20 is in contact with the electrolytic solution. The mother tank 360 is filled with an electroplating solution, which is transported from a solution transport pipe 380 to the inner sub-tank 320 by a solution transport pump, and the electroplating solution in the inner sub-tank 320 can flow back to the mother tank 360 through a solution reflux pipe 390, so that the electroplating solution can fill the area below the substrate 70 in the inner sub-tank 320.

[0117] like Figure 3As shown, the inner sub-groove 320 is fixedly arranged below the substrate 70 by four horizontal adjustment feet 81, and the horizontal adjustment feet 81 are respectively installed at the bottom of 80. When electrolysis is carried out, a part of the outer periphery of the second masking belt 20 of the material 30 is exposed to contact with the electroplating solution, that is, the shielded surface of the material 30 is not in contact with the electrolytic solution, and the surface to be processed of the material 30 is in close contact with the electrolytic solution, thereby achieving the purpose of local surface electrolysis of the material 30. It should be noted that in the production and processing process, the number of terminal local electrolysis shielding devices 510 can be selected within the range of 3 to 9 units according to the required quality of the electrolytic product and the requirements of the thickness of the precious metal film.

[0118] According to embodiment 1 of the present invention:

[0119] (1) Continuous terminal material (material 30): phosphor bronze material, terminal width 13mm, width 0.64mm, thickness 0.16mm; the continuous terminal material is pre-plated with nickel film with a thickness of Min 2.0μm, and the terminal product film thickness measurement points are: 1.7mm from the terminal tip and 0.32mm in the middle of the terminal width ( Fig.13 , 14 ).

[0120] (2) Specifications of continuous terminal electrolytic products: Minimum Rh / Ru of 1.27μm is required on one side and the side; Rhodium and Ruthenium cannot be attached to the other side; Gold plating film thickness is 0.03~0.05μm, which is consistent with the Rh / Ru plating range, and gold cannot be attached to the other side.

[0121] The specific manufacturing process of continuous terminal products is:

[0122] A conventional roll-to-roll continuous terminal surface treatment production line is used, and the continuous terminal material is introduced into an electrolytic degreasing tank through a material discharge buffer machine to remove grease on the surface of the metal material, and then enters an acid activation tank for cleaning and activation treatment to obtain a clean continuous terminal material (material 30).

[0123] Then, before the terminal local electrolytic shielding device 510 is used for electrolytic treatment, the pre-treated continuous terminal material is subjected to a Rh / Ru pre-plating process to form a 0.1 μm Rh / Ru alloy on the nickel layer of the continuous terminal material.

[0124] Subsequently, in the first terminal local electrolysis shielding device, electrolytic anode plate 1 340a and electrolytic anode plate 2 340b are arranged on the left and right sides of the continuous terminal material, and electrolytic anode plate 1 340a and electrolytic anode plate 2 340b are connected to the anode output 250 of the pulse reverse power supply 200; cathode conductive wheel 1 330a at the inlet and cathode conductive wheel 2 330b at the outlet are connected to the cathode output of the pulse reverse power supply 260; there are guiding fixtures 350a at the inlet and guiding fixtures 350b at the outlet; on the other hand, as Figure 4 As shown, the continuous terminal material enters the masked electrolysis fixture, one side of which contacts the first masking belt 10 and is completely shielded, and the other side contacts the second masking belt 20, and is shielded except for the area that needs electrolysis. In addition, a masking belt guide 21 is also provided on the substrate 70, and the masking belt guide 21 is slidably connected to the first masking belt 10 or the second masking belt 20 to limit the movement trajectory of the corresponding first masking belt 10 or the second masking belt 20. The first masking belt 10 and the second masking belt 20 are clamped at the position where the material 30 is contacted by the masking belt guide 21 to ensure the clamping of the material 30 and achieve the shielding effect.

[0125] Similarly, the connection method of the second terminal local electrolysis shielding device to the seventh terminal local electrolysis shielding device is the same as the connection method of the first terminal local electrolysis shielding device. Figure 1 and Figure 2 shown.

[0126] Since the coating specification of the continuous terminal material is Min1.27μm, it is a product with high film thickness. The pre-plating rhodium and ruthenium section is plated with 0.1μm, so it is necessary to plate Rh / Ru with Min1.17μm in the subsequent process. It is preferred that 7 units of masked electrolysis equipment be used for local masked electrolysis treatment; the total amount of Rh / Ru plating for the manufacture of seven pulse reverse power supplies is set to 21 equal parts, and each part is 0.051~0.057μm; for example, the pulse reverse power supply of experimental condition No. 1 accounts for 15 parts, and the Rh / Ru film thickness range to be achieved after treatment is 0.835~0.907μm, and the second to sixth pulse reverse power supplies each account for 1 part. After treatment with each pulse reverse power supply, the Rh / Ru film thickness range on the material surface must meet 0.055~0.060μm (see Table 1 for details).

[0127] Table 1 Allocation of coating surface thickness produced by 7 pulse reverse power supplies Unit: μm

[0128]

[0129]

[0130]

[0131] The operating speed of the continuous terminal masked electrolysis equipment manufacturing production line is preferably 3.5m / min; when 7 pulse reverse power supplies adopt condition No. 7 in Table 1, the Rh / Ru film thickness range of 7 electrolysis is all between 0.167 and 0.181μm, that is, the forward and reverse pulse currents and forward and reverse pulse time conditions set by the 7 pulse reverse power supplies are the same, and the obtained film thickness and density from the bottom layer to the surface layer are very small, and the surface characteristics of the continuous terminal material are uniform.

[0132] When condition No. 1 is adopted, the pulse reverse power supply needs to be set with a larger forward pulse current and a longer forward pulse time, while the reverse pulse current setting value should be smaller and the reverse pulse time setting should be shorter; the obtained electrolytic Rh / Ru has a larger roughness and a poorer density; the setting conditions of the subsequent six pulse reverse power supplies are smaller forward pulse currents and longer forward pulse times compared with condition No. 7, while the reverse pulse current setting value is slightly larger than that of condition No. 7, and the reverse pulse time is much shorter than that of No. 7; therefore, the obtained film thickness meets the product specifications and has a better surface density than condition No. 7.

[0133] When conditions No. 2 to No. 6 are adopted, the surface film thickness of the continuous terminal material meets the requirements and the density range is between conditions No. 1 and No. 7.

[0134] When condition No.13 is used, the six pulse reverse power supplies need to set a smaller forward pulse current and a longer forward pulse time, while setting a large reverse pulse current and a very short reverse pulse time; the Rh / Ru coating obtained is thinner and has better density. The setting conditions of the last pulse reverse power supply are a larger forward pulse current and a longer forward pulse time, while setting a larger reverse pulse current and a shorter reverse pulse time. Therefore, the surface film thickness obtained meets the product specifications, but the surface density is slightly worse than condition No.7.

[0135] When conditions No. 8 to No. 12 are adopted, the film thickness of the continuous terminal material meets the requirements and the density is between conditions No. 7 and No. 13.

[0136] After being fully washed with water, the obtained Rh / Ru continuous terminal material is electrolyzed using a local masked electrolysis device 600 to obtain a final product of Au0.10μm that meets the product specification requirements.

[0137] Through the above comparative experiments, the best condition of this embodiment is No.5.

[0138] According to another comparative embodiment of the present invention:

[0139] The test conditions were the same as those of Example 1 except that seven asymmetric AC wave rectifiers of the same model were used to replace the pulse reverse power supply. The other test steps were the same as those of Example 1. The Rh / Ru film thickness at the product measurement point reached ≧1.27 μm, which met the product specifications.

[0140] like Fig. 9 and Fig.10As shown, the distribution of precious metal film thickness obtained by electrolysis with pulse periodic reverse wave and commonly used asymmetric AC wave is completely different. With pulse reverse power supply, the metal is electrolyzed on the surface of continuous terminal material by applying positive pulse wave. After the set positive pulse time is over, it automatically switches to reverse pulse wave to electrolyze and strip metal on the surface of continuous terminal material. The reverse pulse wave current preferentially strips the area with high current density on the terminal surface, such as the tip or corner of the terminal. Similarly, after the reverse pulse time is over, it automatically switches to positive pulse current wave. The result of such reciprocating periodic electrolysis is a uniform distribution of metal film thickness ( Fig. 9 On the contrary, the commonly used asymmetric AC wave power supply, for the electrolysis process of the continuous terminal surface, only electrolytic precipitation occurs on the material surface. As the electrolytic precipitation accumulates, when the measurement point of the flat part reaches the specification requirements, the film thickness at the tip or corner of the terminal increases much more than that in the flat area ( Fig.10 ).

[0141] from Fig. 9 and Fig.10 It can be seen that the amount of precious metals electrolyzed by the asymmetric AC wave power supply is much greater than that of the pulse periodic reverse wave power supply, based on the fact that the measurement point of the flat part meets the specification requirements. The amount of precious metals saved can be solved from the following formula:

[0142] Saving of precious metals (%) = (asymmetric AC wave - pulse periodic reverse wave) / asymmetric AC wave.

[0143] According to embodiment 2 of the present invention:

[0144] (1) Continuous terminal material: phosphor bronze material, terminal width 15mm, width 0.64mm, thickness 0.16mm; the continuous terminal material is pre-plated with nickel film with a thickness of Min 2.0μm, and the terminal product film thickness measurement points are: 2mm from the terminal tip and 0.32mm in the middle of the terminal width ( Fig.15 and Fig.16 ).

[0145] Table 2: Allocation of coating surface thickness produced by 9 pulse reverse power supplies Unit: μm

[0146]

[0147]

[0148]

[0149]

[0150] (2) Specifications of continuous terminal electrolytic products: The minimum palladium nickel requirement on one side and the side is 1.52μm; palladium nickel cannot adhere to the other side; the gold plating film thickness is 0.03~0.05μm, which is consistent with the Pd / Ni plating range; gold cannot adhere to the other side.

[0151] The specific manufacturing process of continuous terminal products is:

[0152] The conventional roll-to-roll continuous terminal surface treatment production line is adopted. The continuous terminal material is introduced into the electrolytic degreasing tank through the unloading buffer machine to remove the grease on the surface of the metal material, and then enters the acid activation tank for cleaning and activation treatment to obtain a clean continuous terminal material.

[0153] Then, before the electrolysis treatment is performed using a masked electrolysis device, the pre-treated continuous terminal material is subjected to a Pd / Ni pre-plating process to form a 0.1 μm Pd / Ni alloy on the nickel layer of the continuous terminal material.

[0154] Subsequently, in the first terminal local electrolysis shielding device, electrolytic anode plate 1 340a and electrolytic anode plate 2 340b are provided on the left and right sides of the continuous terminal material, and electrolytic anode plate 1 340a and electrolytic anode plate 2 340b are connected to the anode output 250 of the pulse reverse power supply 200; cathode conductive 1 330a at the inlet and cathode conductive 2 330b at the outlet are connected to the cathode output of the pulse reverse power supply 260; there are guiding fixtures 350a at the inlet and guiding fixtures 350b at the outlet; on the other hand, as Figure 4 As shown, the continuous terminal material enters the electrolysis masking jig, one side of which contacts the first masking belt 10 and is completely masked, and the other side contacts the second masking belt 20, and is masked except for the area that needs electrolysis. In addition, a masking belt guide 21 is also provided on the substrate 70, and the masking belt guide 21 is slidably connected to the first masking belt 10 or the second masking belt 20 to limit the movement trajectory of the corresponding first masking belt 10 or the second masking belt 20. The first masking belt 10 and the second masking belt 20 are clamped at the position where the material 30 is contacted by the masking belt guide 21 to ensure the clamping of the material 30 and achieve the shielding effect.

[0155] Similarly, the connection method of the second terminal local electrolysis shielding device to the seventh terminal local electrolysis shielding device is the same as the connection method of the first terminal local electrolysis shielding device. Figure 1 and Figure 2 shown.

[0156] The electrolytic film thickness specification of the continuous terminal is Min1.52μm, which is a high-thickness product. The electrolytic film thickness of the pre-palladium-nickel plating section is 0.1μm, so it is necessary to electrolyze Min1.42μm of Pd / Ni in the subsequent process. It is preferred that 9 units of local electrolysis equipment be used for local masked electrolysis treatment; the total amount of local Pd / Ni plating manufactured by nine pulse reverse power supplies 510 to 590 is set to 27 equal parts, each of which is 0.052~0.056μm; for example, the pulse reverse power supply of experimental condition No. 1 accounts for 17 parts, and the Pd / Ni film thickness range to be achieved after treatment is 0.894~0.957μm. The 8 pulse reverse power supplies of the pulse reverse power supply each account for 1 part. After treatment with each pulse reverse power supply, the Pd / Ni film thickness range on the material surface must meet 0.052~0.056μm (see Table 2 for details).

[0157] The operating speed of the terminal local electrolysis shielding equipment manufacturing production line is preferably 3.0m / min; when 9 pulse reverse power supplies adopt condition No. 8 in Table 1, the Pd / Ni film thickness range of 9 electrolysis is all between 0.157 and 0.168μm, that is, the forward and reverse pulse currents and forward and reverse pulse time conditions set by the 9 pulse reverse power supplies are the same, and the obtained film thickness and density from the bottom layer to the surface layer are very small, and the surface characteristics of the continuous terminal material are uniform and consistent.

[0158] When condition No.1 is adopted, 17 equal parts of the second pulse reverse power supply need to be set with a larger forward pulse current and a longer forward pulse time, while the setting value of the reverse pulse current should be smaller and the setting value of the reverse pulse time should be shorter; the obtained electrolytic Pd / Ni film thickness is thicker and the density is slightly worse; 3 equal parts of the subsequent pulse reverse power supply are set with a relatively small forward pulse current and a longer forward pulse time, while the setting value of the reverse pulse current should be smaller; the setting conditions of each equal part of the subsequent seven pulse reverse power supplies are smaller forward pulse current and longer forward pulse time compared with condition No.8, while the setting value of the reverse pulse current is slightly larger than that of condition No.8, and the reverse pulse time is much shorter than that of No.8; therefore, the obtained film thickness meets the product specifications and has a better surface density than condition No.8.

[0159] When conditions No. 2 to No. 7 are adopted, the surface film thickness of the lead frame material meets the requirements and the density range is between conditions No. 1 and No. 8.

[0160] When condition No.15 is adopted, seven pulse reverse power supplies need to be set with a smaller forward pulse current and a longer forward pulse time, while a large reverse pulse current and a very short reverse pulse time are set; the obtained Pd / Ni coating film thickness is thinner and has a better density; the subsequent pulse reverse power supplies adopt the same conditions as No.8 to obtain a surface with relatively good density; the setting conditions of the last pulse reverse power supply are a larger forward pulse current and a longer forward pulse time, while a larger reverse pulse current and a shorter reverse pulse time are set, so the obtained surface film thickness meets the product specifications, but the surface density is slightly worse than that of condition No.8.

[0161] When conditions No. 8 to No. 14 are adopted, the film thickness of the continuous terminal material meets the requirements and the density is between conditions No. 9 and No. 15.

[0162] After being fully washed with water, the obtained Pd / Ni continuous terminal material is electrolyzed using a local electrolysis masking device 600 to obtain a final product of Au0.10μm that meets product specification requirements.

[0163] Through the above comparative experiments, the best condition of this embodiment is No.6.

[0164] According to embodiment 3 of the present invention:

[0165] (1) Continuous terminal material: phosphor bronze material, terminal width 13mm, width 0.64mm, thickness 0.16mm; the continuous terminal material is pre-plated with nickel film with a thickness of Min 2.0μm, and the terminal product film thickness measurement points are: 1.7mm from the terminal tip and 0.32mm in the middle of the terminal width ( Fig.13 and 14 ).

[0166] (2) Specifications of continuous terminal electrolytic products: a minimum palladium-nickel coating of 0.38 μm is required on one side and the side; palladium-nickel cannot adhere to the other side; the gold-plated film thickness is ≥ 0.76 μm, the range is consistent with the Pd / Ni plating, and gold cannot adhere to the other side.

[0167] The specific manufacturing process of continuous terminal products is:

[0168] The conventional roll-to-roll continuous terminal surface treatment production line is adopted. The continuous terminal material is introduced into the electrolytic degreasing tank through the unloading buffer machine to remove the grease on the surface of the metal material, and then enters the acid activation tank for cleaning and activation treatment to obtain a clean continuous terminal material.

[0169] Then, if Fig.15As shown, before the masked electrolysis equipment 510 is used for electrolysis treatment, the pre-treated continuous terminal material is subjected to a Pd / Ni pre-plating process 500 to form a 0.1 μm Pd / Ni alloy on the nickel layer of the continuous terminal material.

[0170] Subsequently, in the first shielded electrolysis device 510, anode plates 340a and 340b are provided on the left and right sides of the continuous terminal material and connected to the anode output 250 of the pulse reverse power supply 200; the cathode conductive 330a at the inlet and the cathode conductive 330b at the outlet are connected to the cathode output of the pulse reverse power supply 260; there are guiding jigs 350a at the inlet and guiding jigs 350b at the outlet; on the other hand, as Figure 4 As shown, the continuous terminal material enters the masked electrolysis fixture, one side of which is in contact with the first masking belt 10 and is completely shielded, and the other side is in contact with the second masking belt 20, and is shielded except for the area that needs electrolysis. In addition, a masking belt guide 21 is also provided on the substrate 70, and the masking belt guide 21 is slidably connected to the first shielding belt 10 or the second shielding belt 20 to limit the movement trajectory of the corresponding first shielding belt 10 or the second shielding belt 20. The first shielding belt 10 and the second shielding belt 20 are clamped at the position where the material 30 is contacted by the masking belt guide 21 to ensure the shielding effect.

[0171] Likewise, the connection method of the masked electrolysis device 520 to the masked electrolysis device 600 is the same as the connection method of the first local masked electrolysis device 510. Figure 2 and Fig.17 shown.

[0172] The specification of continuous terminal material is Min 0.38μm palladium nickel product. The running speed of the continuous terminal material masked electrolysis equipment manufacturing production line is preferably 3.0m / min; the pre-plating palladium nickel is plated to 0.08μm, and then Min 0.30μm Pd / Ni needs to be plated. Preferably, 3 units of masked electrolysis equipment are used for local masked electrolysis treatment; the total amount of local Pd / Ni plating of the three pulse reverse power supplies 510 to 530 is divided into 3 equal parts, and each equal part is plated with an average of 0.10μm; the setting conditions of the pulse reverse power supply adopt the optimal conditions of Example 2.

[0173] The palladium nickel continuous terminal material is thoroughly washed with pure water, and then pre-gold-plated at 0.08 μm using a masked electrolysis device 540 with a commonly used asymmetric AC wave current. Subsequently, Au plating with a Min of 0.68 μm is required, and six masked electrolysis devices 550 to 600 with pulse reverse power supplies are used. The setting conditions of the pulse reverse power supply adopt the optimal conditions of Example 1 for electrolysis to obtain a final product of Au 0.76 μm that meets the product specification requirements.

[0174] Corrosion resistance test example of a continuous terminal product according to the present invention:

[0175] The corrosion resistance test samples are made of the same terminal material such as Fig.13 shown.

[0176] Sample 1: Ni, 2.0 μm, Rh / Ru, 1.27 μm, Au, 0.03-0.05 μm; prepared according to No. 5 of Example 1.

[0177] Sample 2: Ni, 2.0 μm, Pd / Ni, 1.52 μm, Au, 0.03-0.05 μm; prepared according to No. 6 of Example 2.

[0178] Sample 3: Ni, 2.0 μm, Pd / Ni, 0.38 μm, Au, ≧0.76 μm; prepared according to the optimal conditions of Example 3.

[0179] Nitric acid exposure test: The nitric acid exposure test of the product with gold plating on the surface of the connector terminal is implemented according to the non-reference method and the corrosion resistance of the product is evaluated; the test time is 2 hours.

[0180] The experimental results are as follows Figures 17 to 20 As shown, the corrosion resistance is judged based on the results of the sample corrosion degree. [Corrosion resistance test of continuous terminal products]

[0181] The corrosion resistance test samples are made of the same terminal material such as Fig.13 shown.

[0182] Sample 1: Ni, 2.0 μm, Rh / Ru, 1.27 μm, Au, 0.03-0.05 μm; prepared according to No. 5 of Example 1.

[0183] Sample 2: Ni, 2.0 μm, Pd / Ni, 1.52 μm, Au, 0.03-0.05 μm; prepared according to No. 6 of Example 2.

[0184] Sample 3: Ni, 2.0 μm, Pd / Ni, 0.38 μm, Au, ≧0.76 μm; prepared according to the optimal conditions of Example 3.

[0185] Nitric acid exposure test: Nitric acid exposure test method for products with gold plating on the surface of connector terminals, evaluates the corrosion resistance of the product based on non-reference literature methods; test time is 2 hours.

[0186] The experimental results are as follows Figures 17 to 19 As shown in the figure, sample 1 is almost not corroded and has excellent corrosion resistance; Rh / Ru alloy plays a very important role. Samples 2 and 3 are corroded to varying degrees, and the corrosion resistance of Pd / Ni alloy is far behind that of Rh / Ru alloy.

[0187] like Fig. 20 As shown in the figure, the percentage of corroded area after the test was calculated using the micro-grid experimental method. The corrosion rate of sample 1 was only 0.03%; the corrosion rate of sample 2 with the same gold film thickness as sample 1 was 11.13%; and the corrosion rate of thick gold sample 3 was 2.03%. Compared with thin gold sample 1, the corrosion resistance of thick gold is far inferior to that of thin gold sample. The reason is that the Rh / Ru alloy coating electrolytically deposited by pulse periodic reverse electrolysis technology has very excellent corrosion resistance.

[0188] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0189] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A terminal local electrolytic shielding device for surface treatment of a material (30), characterized in that: The invention comprises a local electrolysis masking jig (100), wherein the local electrolysis masking jig (100) comprises: a first masking belt (10) and a second masking belt (20), wherein the second masking belt (20) is arranged on one side of the first masking belt (10) and is in the same conveying direction as the first masking belt (10), a channel extending along the conveying direction is formed between the second masking belt (20) and the first masking belt (10), the material (30) passes through the channel, the length direction of the material (30) is in the same conveying direction as the belt, and the material (30) is clamped between the first masking belt (10) and the second masking belt (20). ), the orthographic projection of the material (30) on the first masking belt (10) is located inside the first masking belt (10), and the orthographic projection of the second masking belt (20) on the material (30) is located inside the material (30), so that a portion of the material (30) is exposed from the outer periphery of the second masking belt (20); the width of the first masking belt (10) is not less than the width of the material (30), and the width of the second masking belt (20) is less than the width of the material (30); and a cathode conductive wheel is connected to the portion of the material (30) that passes through the first masking belt (10) and the second masking belt (20) in the extension direction; It also includes a belt guide rail (21), the belt guide rail (21) being slidably connected to the first masking belt (10) or the second masking belt (20) so as to define a movement track of the corresponding first masking belt (10) or the second masking belt (20); It also includes an electrolytic device (500), wherein the local electrolytic masking jig (100) is disposed in the electrolytic device (500), the material (30) passes through the electrolytic device (500), a receiving chamber filled with electroplating liquid is defined in the electrolytic device (500), the material (30) is located in the receiving chamber, and a portion of the material (30) extending out of the outer periphery of the second masking belt (20) contacts the electroplating liquid, and the electrolytic device (500) is connected to a pulse reverse power supply (200); The local electrolysis masking jig (100) further comprises a substrate (70), and the electrolysis device (500) comprises an inner sub-groove (320) with an opening; the substrate (70) is fixedly mounted in the inner sub-groove (320) via a bracket (80), and the first masking belt (10) and the second masking belt (20) are located below the substrate (70); Through holes are provided at both ends of the inner sub-groove (320), and the material (30) passes through the through holes. Pairs of position limiting and guiding fixtures are provided outside the inner sub-groove (320) near the through holes, and the material (30) is clamped between each pair of position limiting and guiding fixtures. The electrolysis device (500) further comprises a main tank (360) for containing electroplating solution, and the main tank (360) and the inner sub-tank (320) are connected to each other via a solution delivery pipeline (380).

2. The terminal partial electrolysis shielding device according to claim 1, characterized in that: A first tension control assembly is arranged in the first masking belt (10), the first tension control assembly comprising a tensioning wheel (45) and a first transmission wheel (43), the tensioning wheel (45) and the first transmission wheel (43) forming a motion circuit of the first masking belt (10). A second tension control assembly is arranged in the second masking belt (20), and the second tension control assembly comprises a tensioning wheel (45) and a second transmission wheel (44), and the tensioning wheel (45) and the second transmission wheel (44) constitute a motion loop of the second masking belt (20).

3. The terminal partial electrolysis shielding device according to claim 2, characterized in that: The first transmission wheel (43) is connected to the second gear (41), the second transmission wheel (44) is connected to the third gear (42), the second gear (41) and the third gear (42) are meshed with each other, the second gear (41) is also meshed with the speed regulating gear (40), and the speed regulating gear (40) is transmission-connected to the rotating shaft (53) of the motor (50).

4. The terminal partial electrolytic shielding device according to claim 1, characterized in that: The current output by the pulse reverse power supply (200) and applied near the material (30) changes periodically; when the positive pulse current is applied, a metal film is electrolytically deposited on the material (30), presenting a pulse positive waveform; When a reverse pulse current is applied after the periodic change, the metal film on the material (30) is electrolytically stripped, presenting a pulse reverse waveform.

5. The terminal partial electrolysis shielding device according to claim 4, characterized in that: The electrolysis device (500) is also provided with an electrolysis anode plate, the electrolysis anode plate extending a portion of the outer periphery of the second masking belt (20) toward the material (30), the electrolysis anode plate being connected to the anode output connector (250) of the pulse reverse power supply (200), and the cathode conductive wheel being connected to the cathode output connector (260) of the pulse reverse power supply (200).

6. The terminal partial electrolytic shielding device according to claim 1, characterized in that: The solution delivery pipeline (380) is provided with a solution delivery pump (370), and a solution reflux pipeline (390) is also connected between the main tank (360) and the inner sub-tank (320).

7. A continuous terminal electrolysis device, comprising a plurality of terminal local electrolysis shielding devices as described in any one of claims 1 to 6, wherein the plurality of terminal local electrolysis shielding devices are arranged side by side and spaced from front to back, and the material (30) passes between the first masking belt (10) and the second masking belt (20) of each terminal local electrolysis shielding device.

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