Adjustable matrix anodic oxidation device

Abstract

The utility model belongs to the technical field of magnesium and magnesium alloy anodic oxidation clamps, and particularly relates to an adjustable matrix anodic oxidation device which comprises a base, a plurality of lower sockets are arranged on the base, a position control truss is connected to the top face of the base, and an installation groove is formed in the top face of the position control truss. A mounting groove is formed in the lower socket, the top ends of a plurality of self-adaptive telescopic rod structures are connected into the mounting groove, the self-adaptive telescopic rod structures are vertically arranged, the bottom ends of the self-adaptive telescopic rod structures are connected with upper sockets, and magnesium alloy sample plates are connected between the lower sockets and the corresponding upper sockets in an abutting mode. By means of the structure, the adjustable matrix anodic oxidation device can conveniently and stably conduct anodic oxidation operation on the magnesium alloy sample plate and can be conveniently matched with the magnesium alloy sample plates of different sizes at the same time.

Description

Technical Field

[0001] The utility model belongs to the technical field of magnesium and magnesium alloy anodizing fixtures, in particular to an adjustable matrix anodizing device. Background Art

[0002] Magnesium (Mg) is considered to be the best green material in the 21st century. Magnesium alloys have excellent physical and chemical properties, such as low density, high specific strength and specific stiffness, good damping performance, good biocompatibility, large hydrogen storage capacity, and high theoretical specific capacity of batteries. Therefore, magnesium and its alloys have received increasing attention in the fields of aerospace, automobiles, 3C (computers, communications, and consumer electronics), biomedicine, and energy, and have great application potential. Generally speaking, high strength and corrosion resistance are two important indicators for measuring high-performance metal structural materials including magnesium alloys. However, compared with other metal materials, traditional magnesium alloys have relatively low mechanical properties and poor corrosion resistance. In particular, it is difficult to obtain these two excellent indicators in the same alloy at the same time, which seriously hinders its widespread application in the engineering field. Therefore, how to simultaneously improve the mechanical properties and corrosion resistance of magnesium alloys is a difficult problem that needs to be solved to promote the application of magnesium alloys.

[0003] The corrosion resistance of magnesium and magnesium alloys in electrolyte and water environments is low, and there are various types of corrosion mechanisms between the surrounding environment. For example, biological corrosion, electrochemical corrosion between different metals and between metal elements, particle corrosion, pitting corrosion, crevice corrosion and friction corrosion, erosion corrosion, stress corrosion and corrosion fatigue will cause changes in the composition of magnesium or its alloys. Moreover, the corrosion of magnesium and magnesium alloys in a specific environment may be a combination of multiple corrosion forms, and the corrosion form of the alloy changes from initial uniform corrosion to severe local corrosion, resulting in accelerated corrosion. The reason for the poor corrosion resistance of magnesium and magnesium alloys is, on the one hand, the high negative potential of magnesium (emf≈-2.363V), and on the other hand, the poor protective performance of the surface film formed on the surface of magnesium. During the corrosion process, magnesium undergoes an anodic reaction, releasing magnesium ions and electrons. These electrons react with the surrounding medium (water) to produce hydrogen and hydroxyl ions. Then, these hydroxyl ions combine with oxygen, electrons and water to form more hydroxyl ions. Magnesium ions combine with these hydroxyl ions to form a protective layer of magnesium hydroxide, but this protective layer is not stable for a long time. Magnesium hydroxide further reacts with chloride ions to release magnesium chloride, thereby reducing corrosion resistance. Rapid corrosion and non-uniform corrosion of magnesium alloys can cause the mechanical properties of the alloys to decay too quickly, and even collapse and decay. Therefore, in order to improve the mechanical properties and degradation properties of magnesium alloys and reduce their degradation rate, the more commonly used methods include metallurgical treatment, preparation and processing, and surface modification. Metallurgical treatment mainly adjusts the alloy composition to achieve the purification, strengthening and formation of stable phases and homogenization of microstructures of magnesium alloys. Preparation and processing mainly induce microstructural evolution, precipitation of strengthening phases, and uniform organization. Surface modification protective coating is a widely used and cost-effective method for corrosion protection of metal substrates. The corrosion protection method of protective coatings is mainly achieved by providing a physical barrier to avoid contact with corrosive media. Protective coatings mainly include chemical conversion coatings, anodizing, micro-arc oxidation, chemical plating / electroplating, organic coatings, laser surface treatment, physical / chemical vapor deposition, and hot / cold spraying. Among them, anodized protective coatings are a widely used method that can produce a thick, hard, and stable ceramic coating that provides excellent corrosion protection for magnesium parts. In addition, the anodized layer provides excellent wear resistance, so magnesium parts are less likely to be damaged during assembly than conversion coatings. Essentially, anodizing is an oxidation reaction in aqueous solution, which can be technically accomplished under two different conditions: voltage-controlled or current-controlled.During the actual operation, we found that, firstly, the metal material of ordinary clamps will react with the electrolyte during the anodizing process to generate new ions that act on the surface of the material to be processed, changing the composition of the anodized protective coating; secondly, many of the anodized samples are plate-shaped materials, and there are no hanging holes on the surface of the plate, and holes cannot be punched. The anodizing process requires clamping with a conductive clamp, and the contact area between the conductive clamp and the material surface is large, so the area covered by the clamp fails to achieve anodization, affecting the surface quality of the protective coating and making it easy to have local corrosion and galvanic corrosion; in addition, when using such clamps, the efficiency of the pattern replacement process is low, and only one or several plates can be processed at a time; thirdly, general clamps can only process plate samples of fixed shape and the same thickness.

[0004] Therefore, it is very meaningful to design an anodizing fixture that is easy to operate, simple in structure, has a small contact point, and can simultaneously process plates of different shapes and thicknesses in order to improve the corrosion resistance of magnesium alloys.

[0005] In summary, the existing anodizing fixtures have cumbersome clamping methods, poor processing quality, fixed sample size, and inability to process multiple samples at the same time. These problems seriously affect the development prospects and application promotion of magnesium alloy anodizing protective coatings.

[0006] In view of this, the purpose of the present invention is to provide a magnesium and magnesium alloy matrix adjustable anodizing fixture to improve the existing anodizing fixture problems. Utility Model Content

[0007] The utility model aims to provide an adjustable matrix anodizing device to solve the above problems.

[0008] To achieve the above purpose, the utility model provides the following solutions:

[0009] An adjustable matrix anodizing device comprises: a base, a plurality of lower sockets are arranged on the base, a position control truss is connected to the top surface of the base, a mounting groove is arranged on the top surface of the position control truss, the top ends of a plurality of adaptive telescopic rod structures are connected in the mounting groove, the adaptive telescopic rod structures are vertically arranged, an upper socket is connected to the bottom end of the adaptive telescopic rod structures, and the lower sockets are arranged correspondingly to the corresponding upper sockets in the upper and lower directions.

[0010] Preferably, the base includes two parallel support plates, the bottom end of the control truss is fixed to the support plate by a first bolt, two mounting frames are provided between the two support plates, the mounting frames are vertically arranged to the support plates, a plurality of mounting holes are opened on the top surface of the mounting frames, and the lower socket is connected to the corresponding mounting holes.

[0011] Preferably, the lower socket includes two symmetrically arranged lower socket plates, the top edge of the lower socket plates is fixedly connected with a concave plate, the concave plate is vertically arranged, the bottom end of the magnesium alloy template is clamped with the inner side of the concave plate, and a plurality of limiting holes are opened on the lower socket, and the limiting holes are fixedly connected with the corresponding mounting holes through pins.

[0012] Preferably, a copper sheet is provided in the installation groove, and the top end of the adaptive telescopic rod structure is connected to the copper sheet.

[0013] Preferably, the adaptive telescopic rod structure includes a slide cylinder, the slide cylinder is arranged below the copper sheet, the top end of the slide cylinder is threadedly connected to a second bolt through a connecting block, the top end of the second bolt is clamped above the copper sheet, and the second bolt is arranged in contact with the copper sheet;

[0014] The bottom end of the slide cylinder is fixedly connected to a limit plate, a slider is slidably connected to the inner side of the slide cylinder, one end of a return spring is fixedly connected to the top surface of the slider, the other end of the return spring is fixedly connected to the inner side of the slide cylinder, a slide rod is fixedly connected to the bottom surface of the slider, the slide rod is vertically arranged, the top end of the slide rod passes through the limit plate, and the bottom end of the slide rod is fixedly connected to the upper socket.

[0015] Preferably, a copper rod is provided on the inner side of the slide rod, the bottom end of the copper rod passes through the upper socket, and a pointed head is provided on the bottom end of the copper rod, and the pointed head abuts against the corresponding top surface of the magnesium alloy sample plate.

[0016] Preferably, the upper socket is of an inverted concave shape, and the top end of the magnesium alloy sample is clamped on the inner side of the upper socket.

[0017] Compared with the prior art, the utility model has the following advantages and technical effects:

[0018] This device achieves effective clamping of the magnesium alloy sample by cooperating with the lower socket and the upper socket. At the same time, an adaptive telescopic rod structure is provided which can push the upper socket to adapt to magnesium alloy samples of different sizes. The elastic structure in the adaptive telescopic rod structure is utilized to ensure that the upper socket can maintain contact with the magnesium alloy sample.

[0019] By utilizing these structures, the device realizes an adjustable matrix anodizing device that can conveniently and stably perform anodizing operations on magnesium alloy samples and can conveniently adapt to magnesium alloy samples of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor:

[0021] Figure 1 A schematic diagram of a fixture for anodizing equipment of the utility model equipped with magnesium alloy samples of different shapes and sizes;

[0022] Figure 2 It is a schematic diagram of matrix processing of the anodizing device of the utility model;

[0023] Figure 3 It is a partial cross-sectional view of the utility model;

[0024] Figure 4 It is a schematic diagram of the lower socket of the anodizing device of the utility model in different sizes;

[0025] Figure 5 It is a structural schematic diagram of the adaptive telescopic rod structure of the anodizing device of the utility model;

[0026] Figure 6 This is a surface morphology of the anodic oxidation protective coating prepared in the embodiment of the present utility model.

[0027] Among them, 1. base; 2. lower socket; 3. position control truss; 4. adaptive telescopic rod structure; 5. upper socket; 6. magnesium alloy sample; 101. support plate; 102. mounting frame; 103. mounting hole; 104. connecting hole; 105. connecting plate; 106. first bolt; 201. lower socket plate; 202. limit hole; 203. concave plate; 301. mounting groove; 302. copper sheet; 401. slide cylinder; 402. second bolt; 403. limit plate; 404. slider; 405. slide rod; 406. copper rod; 407. connecting block; 408. reset spring. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] Reference Figures 1 to 6 The utility model discloses an adjustable matrix anodizing device, comprising: a base 1, a plurality of lower sockets 2 are arranged on the base 1, a position control truss 3 is connected to the top surface of the base 1, a mounting groove 301 is arranged on the top surface of the position control truss 3, a plurality of top ends of adaptive telescopic rod structures 4 are connected in the mounting groove 301, the adaptive telescopic rod structure 4 is vertically arranged, an upper socket 5 is connected to the bottom end of the adaptive telescopic rod structure 4, and the lower socket 2 and the corresponding upper socket 5 are arranged correspondingly up and down.

[0031] The utility model forms a frame body capable of placing a plurality of magnesium alloy samples 6 by providing a base 1 and a position-controlling truss 3, so as to accommodate a plurality of magnesium alloy samples 6 for oxidation. When in use:

[0032] Step 1: Pre-treat the magnesium alloy sample 6: sand and polish the sample to be processed, degrease and remove oil from the surface, and check the appearance quality.

[0033] Step 2: Prepare electrolyte: Prepare electrolyte according to the requirements of anodized protective coating, the electrolyte may be acidic or alkaline, preferably one of potassium permanganate, borate, sulfate, phosphate, soluble silicate, hydroxide, and fluoride.

[0034] Step 3: Assembling the magnesium alloy sample 6: Fix the magnesium alloy sample 6 to be processed between the corresponding lower socket 2 and upper socket 5, connect the wire, connect the positive pole of the power wire to the copper sheet 302, and connect the negative pole to the electrolytic cell.

[0035] Step 4: Anodizing process: Pour the prepared electrolyte into the electrolytic cell, start the power supply, and set the parameters. The anodizing process of the magnesium alloy sample 6 uses magnesium as the anode and stainless steel, graphite or other metal electrolytic cell wall as the cathode. Under the drive of an external voltage, a protective coating is formed on the surface of the magnesium alloy sample 6 through the electrochemical reaction between the magnesium part and the cathode.

[0036] This device achieves effective clamping of the magnesium alloy template 6 by cooperating with the lower socket 2 and the upper socket 5. At the same time, an adaptive telescopic rod structure 4 is provided which can push the upper socket 5 to adapt to magnesium alloy templates 6 of different sizes. The elastic structure in the adaptive telescopic rod structure 4 is utilized to ensure that the upper socket 5 can maintain contact with the magnesium alloy template 6.

[0037] The device can realize anodizing treatment of magnesium alloy samples 6 of different sizes, shapes and thicknesses. Adjusting the sample processing spacing can also ensure the fluidity of the electrolyte and the quality of the anodized protective coating.

[0038] A further optimized solution is that the base 1 includes two parallel supporting plates 101, the bottom end of the positioning truss 3 is fixedly connected to the supporting plate 101 by a first bolt 106, two mounting frames 102 are provided between the two supporting plates 101, the mounting frames 102 are vertically arranged to the supporting plates 101, a plurality of mounting holes 103 are opened on the top surface of the mounting frames 102, and the lower socket 2 is connected to the corresponding mounting holes 103.

[0039] The end of the support plate 101 in the device is also provided with a connection hole 104. The device can be provided with a plurality of them to form a matrix, and adjacent bases 1 are connected by connecting a connection plate 105 between two connection holes 104. The connection plate 105 is connected to the connection hole 104 by a pin.

[0040] When the device is in use, a plurality of mounting holes 103 are provided to ensure that the position of the lower socket 2 thereon can be adjusted as required.

[0041] In the present device, the base 1, the lower socket 2, the position control truss 3, the adaptive telescopic rod structure 4, and the upper socket 5 are all made of polyvinyl chloride resin material, which can prevent the anodizing device and the electrolyte from generating new ions that act on the surface of the material to be treated and change the composition of the anodizing protective coating, thereby ensuring the quality of the anodizing protective coating.

[0042] A further optimized solution is that the lower socket 2 includes two symmetrically arranged lower socket plates 201, and the top edge of the lower socket plate 201 is fixedly connected with a concave plate 203, the concave plate 203 is vertically arranged, and the bottom end of the magnesium alloy template 6 is clamped with the inner side of the concave plate 203, and a plurality of limiting holes 202 are opened on the lower socket 2, and the limiting holes 202 are fixedly connected with the corresponding mounting holes 103 through pins.

[0043] The two symmetrically arranged lower socket plates 201 form a triangular support structure with the upper socket 5 above, thereby ensuring the stability of the bottom end of the magnesium alloy sample 6.

[0044] According to a further optimized solution, a copper sheet 302 is provided in the installation groove 301 , and the top end of the adaptive telescopic rod structure 4 is connected to the copper sheet 302 .

[0045] Further optimizing the scheme, the adaptive telescopic rod structure 4 includes a slide 401, the slide 401 is arranged below the copper sheet 302, the top of the slide 401 is threadedly connected with a second bolt 402 through a connecting block 407, the top of the second bolt 402 is clamped on the top of the copper sheet 302, and the second bolt 402 is arranged in contact with the copper sheet 302;

[0046] The bottom end of the slide cylinder 401 is fixedly connected to the limit plate 403, the inner side of the slide cylinder 401 is slidably connected to a slider 404, the top surface of the slider 404 is fixedly connected to one end of a return spring 408, the other end of the return spring 408 is fixedly connected to the inner side of the slide cylinder 401, the bottom surface of the slider 404 is fixedly connected to a slide rod 405, the slide rod 405 is vertically arranged, the top end of the slide rod 405 passes through the limit plate 403, and the bottom end of the slide rod 405 is fixedly connected to the upper socket 5.

[0047] According to a further optimization scheme, a copper rod 406 is provided on the inner side of the slide rod 405 , the bottom end of the copper rod 406 passes through the upper socket 5 , and a pointed head is provided on the bottom end of the copper rod 406 , which abuts against the top surface of the corresponding magnesium alloy sample plate 6 .

[0048] The bottom end of the copper rod 406 is threadedly connected to the upper socket 5. By providing a pointed head to abut against the magnesium alloy sample 6, the contact area between the magnesium alloy sample 6 and the device can be ensured.

[0049] In a further optimized solution, the upper socket 5 is of an inverted concave type, and the top of the magnesium alloy sample 6 is clamped on the inner side of the upper socket 5. The inverted concave structure can make the placement of the magnesium alloy sample 6 more stable.

[0050] The above device is used to perform anodizing treatment on a Mg-4Zn-0.5Y-0.5Nd magnesium alloy sheet of 20mm×20mm×2mm, and the steps are as follows:

[0051] Step 1: Pretreatment of magnesium alloy sample 6: The sample to be processed is polished with 800#, 1200#, and 2000# sandpaper, mechanically polished, ultrasonically cleaned with deionized water, anhydrous ethanol, and acetone for 30 minutes in sequence, and finally dried in an oven for 20 minutes.

[0052] Step 2: Prepare the electrolyte: In this example, the anodizing electrolyte is a composite electrolyte, and the preparation process is as follows: 10g / L (NaPO 3 ) 6 and 20 g / L NaOH were added to deionized water in turn and stirred at 400 r / min for 2 h until completely dissolved to obtain the basic electrolyte. Then 1 g / L SiC and 1 g / L CeO were added to the basic electrolyte. 2 , stir thoroughly until completely dissolved.

[0053] Step 3: Sample assembly: The upper end of the adaptive telescopic rod structure 4 is fixed at an appropriate position in the position-control truss 3 by the second bolt 402. The lower end of the 20mm×20mm×2mm Mg-4Zn-0.5Y-0.5Nd magnesium alloy sheet is clamped between the lower socket 2 and the upper socket 5, and the adaptive telescopic rod structure 4 is slowly lifted to push the upper end of the sample against the bottom end of the copper rod 406, and the adaptive telescopic rod structure 4 is loosened to press the lower socket 2 and the upper socket 5 tightly against the object.

[0054] Step 4: This example uses a DC regulated power supply. The magnesium alloy sample 6 and the stainless steel container are the anode and cathode of the anodizing process. The experiment is carried out in constant current mode with a current density of 5A / dm 2 , working time is 10min.

[0055] After the anodizing treatment is completed, the power supply is turned off, the magnesium alloy sample 6 is removed, rinsed with deionized water, and dried in an oven for 30 minutes. The surface morphology of the obtained anodized protective coating is as follows: Figure 6 As shown in the figure, the surface presents a dense porous structure, the thickness of the protective coating is about 10-15 μm, the corrosion potential Ecorr is -1.316 V, and the corrosion current density icorr is 1.887×10 -5 A / cm2, compared with the corrosion potential Ecorr of the matrix Mg-4Zn-0.5Y-0.5Nd magnesium alloy of 1.514V, the corrosion current density icorr is 1.177×10-4A / cm 2 The corrosion resistance of Mg-4Zn-0.5Y-0.5Nd magnesium alloy sheet is significantly improved.

[0056] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0057] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. An adjustable matrix anodizing device, characterized in that: include: A base (1), wherein a plurality of lower sockets (2) are arranged on the base (1), the top surface of the base (1) is connected to a position control truss (3), the top surface of the position control truss (3) is provided with a mounting groove (301), the mounting groove (301) is connected to the top ends of a plurality of adaptive telescopic rod structures (4), the adaptive telescopic rod structures (4) are arranged vertically, the bottom ends of the adaptive telescopic rod structures (4) are connected to upper sockets (5), and the lower sockets (2) and the corresponding upper sockets (5) are arranged in correspondence with each other up and down.

2. The adjustable matrix anodizing device according to claim 1, characterized in that: The base (1) comprises two support plates (101) arranged in parallel, the bottom end of the position control truss (3) is fixedly connected to the support plate (101) by a first bolt (106), two mounting frames (102) are arranged between the two support plates (101), the mounting frames (102) are arranged vertically to the support plates (101), a plurality of mounting holes (103) are opened on the top surface of the mounting frames (102), and the lower socket (2) is connected to the corresponding mounting holes (103).

3. The adjustable matrix anodizing device according to claim 2, characterized in that: The lower socket (2) comprises two symmetrically arranged lower socket plates (201), the top edge of the lower socket plate (201) being fixedly connected with a concave plate (203), the concave plate (203) being arranged vertically, the bottom end of the magnesium alloy sample plate (6) being clamped with the inner side of the concave plate (203), and a plurality of limiting holes (202) being provided on the lower socket (2), the limiting holes (202) being fixedly connected with the corresponding mounting holes (103) via pins.

4. The adjustable matrix anodizing device according to claim 1, characterized in that: A copper sheet (302) is provided in the installation groove (301), and the top end of the adaptive telescopic rod structure (4) is connected to the copper sheet (302).

5. The adjustable matrix anodizing device according to claim 4, characterized in that: The adaptive telescopic rod structure (4) comprises a slide cylinder (401), the slide cylinder (401) is arranged below the copper sheet (302), the top end of the slide cylinder (401) is threadedly connected to a second bolt (402) via a connecting block (407), the top end of the second bolt (402) is clamped above the copper sheet (302), and the second bolt (402) is arranged in contact with the copper sheet (302); The bottom end of the slide cylinder (401) is fixedly connected to a limit plate (403), the inner side of the slide cylinder (401) is slidably connected to a slider (404), the top surface of the slider (404) is fixedly connected to one end of a return spring (408), the other end of the return spring (408) is fixedly connected to the inner side of the slide cylinder (401), the bottom surface of the slider (404) is fixedly connected to a slide rod (405), the slide rod (405) is vertically arranged, the top end of the slide rod (405) passes through the limit plate (403), and the bottom end of the slide rod (405) is fixedly connected to the upper socket (5).

6. The adjustable matrix anodizing device according to claim 5, characterized in that: A copper rod (406) is provided on the inner side of the slide rod (405), the bottom end of the copper rod (406) passes through the upper socket (5), and a pointed head is provided on the bottom end of the copper rod (406), and the pointed head abuts against the top surface of the corresponding magnesium alloy sample plate (6).

7. The adjustable matrix anodizing device according to claim 1, characterized in that: The upper socket (5) is of an inverted concave shape, and the top end of the magnesium alloy sample plate (6) is clamped on the inner side of the upper socket (5).

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