Iridium-tantalum coating for metal electrolysis anode plate and preparation method

Abstract

The invention relates to the technical field of electrode coating preparation, in particular to an iridium tantalum coating for a metal electrolysis anode plate and a preparation method. The catalyst comprises the following raw materials: iridium acetylacetonate, 1, 3-propylene glycol, tantalum pentoxide and dimethylplatinum dichloride. According to the method, the grooves are formed in the surface of the metal anode plate, then part of the substrate liquid is coated on the surface of the metal anode plate, so that the substrate liquid permeates into the grooves and forms the substrate film on the surface, the doped film is formed on the substrate film through a vacuum evaporation method, and the doped film is formed on the substrate film through the bonding characteristic of the substrate film and the high adhesiveness provided by the grooves. A substrate film and a doped film are firmly combined on the surface of a metal anode plate, carboxyl functional groups in 1, 3-propylene glycol in residual substrate liquid are cross-linked and matched with dichlorodimethylplatinum, so that the corrosion resistance and the wear resistance of the coating are improved, the binding force of the coating and other materials is improved, and the iridium tantalum coating with strong adhesive force is generated; and the coating is prevented from falling off, so that the corrosion resistance of the anode plate is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of electrode coating preparation, in particular to an iridium-tantalum coating for anode plates of metal electrolysis and a preparation method thereof. Background Art

[0002] The metal electrolysis anode plate is a positively polarized electrode, through which current can enter the solution, triggering and promoting the desired chemical reaction. The electrolysis reaction puts the metal at a stable potential, thereby slowing down or preventing metal polarization and corrosion and promoting the electrochemical reaction.

[0003] In order to improve the corrosion resistance of the anode plate, the surface coating of the anode plate is generally coated with a material with strong corrosion resistance. For example, CN113584441B involves a metal bipolar plate coating and a preparation method thereof, which adopts a structural design of a substrate, a primer layer, an anti-oxidation layer, and a precious metal doping layer, wherein the primer layer is deposited on the substrate, the anti-oxidation layer is deposited on the primer layer, and the precious metal doping layer is deposited on the anti-oxidation layer. The main components of the primer layer are titanium and one or more of chromium, nickel, aluminum, tungsten, and niobium; the main components of the anti-oxidation layer are one or more of cerium, lanthanum, indium, tin, antimony, tantalum, niobium, manganese, cobalt, and nickel; the components of the precious metal doping layer are titanium, graphite, or one or more of the precious metals doped with ruthenium, iridium, platinum, gold, and silver. The obtained metal bipolar plate has good conductivity and strong corrosion resistance.

[0004] In the coating and preparation method of the above patent, the colloid is evenly dispersed, the particles on the surface of the finished product are uniform, the number of active points on the surface is increased, and the electrocatalytic activity of the titanium anode is improved to a certain extent. However, the adhesion strength between the coating and the anode plate is not improved, so that the coating is easy to fall off during actual use, thereby affecting the corrosion resistance of the anode plate.

[0005] In order to avoid the shedding of the coating and ensure the corrosion resistance of the anode plate, an iridium-tantalum coating for anode plates of metal electrolysis and a preparation method thereof are proposed. Summary of the invention

[0006] The object of the present invention is to provide an iridium-tantalum coating for anode plates of metal electrolysis and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, one of the objects of the present invention is to provide an iridium-tantalum coating for anode plates for metal electrolysis, comprising the following raw materials in parts by weight:

[0008] 15-19 parts by weight of iridium acetylacetonate, 5-8 parts by weight of 1,3-propylene glycol, 22-30 parts by weight of tantalum pentoxide, and 3-7 parts by weight of dimethyl platinum dichloride.

[0009] The second object of the present invention is to provide a method for preparing an iridium-tantalum coating for a metal electrolysis anode plate, comprising the following steps:

[0010] S1. After the surface of the metal anode plate is pretreated, the metal anode plate is placed in a fixing machine and subjected to a groove treatment by a surface treatment machine;

[0011] S2, taking 1,3-propylene glycol and water to make a base liquid, coating part of the base liquid on the surface of the metal anode plate, and cooling and solidifying to form a base film;

[0012] S3, mixing the remaining base liquid with iridium acetylacetonate, tantalum pentoxide, and dimethyl platinum dichloride to prepare a reaction liquid, and coating the reaction liquid on the base film by vacuum evaporation to form a doped film;

[0013] S4. After the doped film layer is squeezed to reduce the coating thickness on the surface of the metal anode plate, the deformed and overflowed material is sheared off to complete the coating preparation.

[0014] As a further improvement of the technical solution, in S1, the surface pretreatment is to clean the surface of the metal anode plate by ultrasonic cleaning, and the depth of the groove formed during the grooving treatment is in the range of 0.17-0.50 mm.

[0015] As a further improvement of this technical solution, in S1,

[0016] The fixing machine comprises a fixing table for placing the metal anode plate, and the fixing table is provided with a fixing structure for fixing the metal anode plate;

[0017] The surface treatment machine includes a groove opening body and an air blowing body connected to the groove opening body, the groove opening body and the air blowing body are both slidably connected to the fixed platform, the groove opening body is used to groove the metal anode plate, and the air blowing body is used to blow away debris generated during the groove opening, the metal anode plate that has undergone surface pretreatment is placed on the fixed platform, the metal anode plate is fixed by the fixed structure, the groove opening body slides along the fixed platform to groove the metal anode plate, the air blowing body uses the movement of the groove opening body to inhale gas and then blows the gas toward the surface of the metal anode plate to remove the debris generated during the groove opening.

[0018] As a further improvement of the present technical solution, the grooving body includes a top plate and a cross bar plugged into and matched with the top plate, a groove milling cutter for grooving the surface of the metal anode plate is provided at the bottom of one end of the top plate, a third screw and a first motor for driving the third screw are provided on the cross bar, the third screw passes through the top plate and is threadedly connected to the top plate, the fixing structure includes a fixing frame slidably connected to the fixed table, one end of the fixing frame is threadedly connected to the first screw, the first screw is rotatably connected to the fixed table, first displacement grooves are provided at the top of both ends of the fixed table, both ends of the cross bar are slidably connected to the first displacement grooves, a second screw and a second motor for driving the second screw are provided at one end of the top of the fixed table, and the second screw is threadedly connected to the air blowing body.

[0019] As a further improvement of the present technical solution, a second displacement groove is provided on the inner walls at both ends of the fixed platform, the air blowing body includes a control plate and an air guide plate arranged at the bottom end of the control plate, the two ends of the control plate are slidably connected to the second displacement groove, the bottom ends of the cross bar are plug-matched with the control plate, the top plate is provided with a first tail hook at the end away from the groove milling cutter, the control plate is provided with an empty groove, a sliding plate is slidably connected to the middle part of the empty groove, the top of the sliding plate is slidably connected to the first tail hook, air bags are connected to the two ends of the sliding plate in the empty groove, the other end of the air bag is connected to the sliding plate, an air inlet pipe for controlling the unidirectional flow of gas into the air bag is provided at the top of one end of the air bag, an air outlet pipe for controlling the unidirectional flow of gas out of the air bag is provided at the bottom of one end of the air bag, and the air outlet pipe is connected to the air guide plate.

[0020] As a further improvement of the present technical solution, a coupling is provided at the bottom of the top plate, a second tail hook is provided at the bottom of the control plate, the control plate is rotatably connected to the air guide plate through the second tail hook, the air guide plate is provided with an air outlet for blowing out air flow, the air outlet is connected to the air outlet pipe through a hose, a connecting frame is provided at the top of the air guide plate, and the connecting frame is slidably connected to the coupling.

[0021] As a further improvement of the technical solution, in S2, when coating the base liquid, the grooves are first filled, and then a base film with uniform thickness is formed on the surface of the metal anode plate, and the thickness of the base film ranges from 0.40 to 1.20 mm.

[0022] As a further improvement of the technical solution, in S3, the distance between the substrates during vacuum evaporation is in the range of 20-30 cm.

[0023] As a further improvement of the technical solution, in S4, the unit pressure value during extrusion is in the range of 4-9 mN / m.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. In the iridium-tantalum coating for metal electrolysis anode plates and the preparation method thereof, grooves are opened on the surface of the metal anode plates, and then part of the base liquid is coated on the surface of the metal anode plates, so that the base liquid penetrates into the grooves and forms a base film on the surface, and a doping film is formed on the base film by vacuum evaporation. The base film and the doping film are firmly bonded to the surface of the metal anode plates by utilizing the bonding properties of the base film and the high adhesion provided by the grooves, and then the carboxyl functional groups in 1,3-propylene glycol in the remaining base liquid are cross-linked with dimethyl platinum dichloride to improve the corrosion resistance and wear resistance of the coating and improve the bonding strength of the coating with other materials, thereby producing an iridium-tantalum coating with strong adhesion, avoiding the shedding of the coating, and ensuring the corrosion resistance of the anode plates.

[0026] 2. In the iridium-tantalum coating and preparation method for metal electrolysis anode plates, the metal anode plate is fixed by a fixed structure, and a groove opening body slides along a fixed platform to groove the metal anode plate. The gas blowing body utilizes the movement of the groove opening body to inhale gas and then blows the gas to the surface of the metal anode plate to remove debris generated during the groove opening, thereby ensuring the groove opening effect on the surface of the metal anode plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a flow chart of the present invention;

[0028] Figure 2 It is the overall cross-sectional structure diagram of the present invention;

[0029] Figure 3 This is a structural exploded view of the fixing machine of the present invention;

[0030] Figure 4 It is a structural diagram of the surface treatment machine of the present invention;

[0031] Figure 5 It is a structural diagram of the trenching body of the present invention;

[0032] Figure 6 It is a disassembled diagram of the air-blowing body structure of the present invention;

[0033] Figure 7 A schematic diagram of top plate control of gas flow according to the present invention;

[0034] Figure 8 It is a schematic diagram of the coordination structure between the top plate and the air guide plate of the present invention;

[0035] Fig. 9 Adhesion strength test of the present invention Figure 1 ;

[0036] Fig.10 Adhesion strength test of the present invention Figure 2 .

[0037] The meaning of each number in the figure is:

[0038] 1. Fixing machine; 11. Fixing table; 111. First displacement slot; 112. Second displacement slot; 12. Fixing frame; 121. First screw rod; 13. Second screw rod;

[0039] 2. Surface treatment machine; 21. Grooving body; 211. Top plate; 212. Cross bar; 213. Grooving cutter; 214. Vertical bar; 215. Third screw; 216. First tail hook; 217. Coupling; 22. Air blowing body; 221. Control board; 2211. Sliding board; 2212. Air bag; 2213. Second tail hook; 222. Wind guide plate; 2221. Air outlet; 2222. Hose; 2223. Connecting frame. DETAILED DESCRIPTION

[0040] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element 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.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] Example 1

[0044] One of the purposes of this embodiment is to provide an iridium-tantalum coating for anode plates of metal electrolysis, comprising 15 parts by weight of iridium acetylacetonate, 8 parts by weight of 1,3-propylene glycol, 22 parts by weight of tantalum pentoxide, and 7 parts by weight of dimethyl platinum dichloride.

[0045] See also Figure 1 As shown, the second purpose of this embodiment is to provide a method for preparing the iridium-tantalum coating for the metal electrolysis anode plate described above, and the specific steps are as follows:

[0046] S1, cleaning the surface of the metal anode plate by ultrasonic cleaning to remove impurities such as surface grease, placing the metal anode plate in a fixing machine 1 and performing groove treatment by a surface treatment machine 2, wherein the groove depth range formed during the groove treatment is 0.17 mm;

[0047] S2, take 8 parts by weight of 1,3-propylene glycol and mix with water to make a base liquid, apply part (less than one third) of the base liquid on the surface of the metal anode plate, and form a base film after cooling and solidification. It is worth noting that when applying the base liquid, the groove is first filled, and then a base film with uniform thickness is formed on the surface of the metal anode plate, and the thickness of the base film, that is, the height difference from the lowest point of the groove to the highest point of the base film, is in the range of 1.20 mm;

[0048] S3, mixing the remaining base liquid with 15 parts by weight of iridium acetylacetonate, 22 parts by weight of tantalum pentoxide, and 7 parts by weight of dimethyl platinum dichloride to prepare a reaction liquid, and coating the reaction liquid on the base film by vacuum evaporation to form a doped film, and the distance range of the substrate during vacuum evaporation is 20 cm;

[0049] S4. After the doped film layer is extruded to reduce the coating thickness on the surface of the metal anode plate, the deformed overflowed material is sheared off to complete the coating preparation. The unit pressure value range during extrusion is 9mN / m.

[0050] In the present invention, after the surface of the metal anode plate is treated, grooves are opened on the surface to reduce the surface smoothness, and then part of the base liquid is coated on the surface of the metal anode plate, so that the base liquid penetrates into the grooves and forms a base film on the surface, and a doping film is formed on the base film by a vacuum evaporation method. The base film and the doping film are firmly combined on the surface of the metal anode plate by utilizing the cross-linking characteristics of the carboxyl functional groups of 1,3-propylene glycol in the base film and the high adhesion provided by the grooves. The main components of the doping film are iridium acetylacetonate and tantalum pentoxide. Iridium acetylacetonate has a high melting point and low oxygen permeability, can remain stable in a high temperature and strong oxidizing environment, and can resist corrosion. Tantalum pentoxide has high chemical stability. The carboxyl functional groups in 1,3-propylene glycol in the remaining base liquid are cross-linked and combined with dimethyl platinum dichloride to improve the corrosion resistance and wear resistance of the coating and improve the bonding force of the coating with other materials, so as to produce an iridium tantalum coating with strong adhesion, avoid shedding of the coating, and ensure the corrosion resistance of the anode plate.

[0051] Example 2

[0052] One of the purposes of this embodiment is to provide an iridium-tantalum coating for anode plates of metal electrolysis, comprising 18 parts by weight of iridium acetylacetonate, 6 parts by weight of 1,3-propylene glycol, 26 parts by weight of tantalum pentoxide, and 5 parts by weight of dimethyl platinum dichloride.

[0053] The second purpose of this embodiment is to provide a method for preparing the iridium-tantalum coating for the metal electrolysis anode plate described above, and the specific steps are as follows:

[0054] S1, cleaning the surface of the metal anode plate by ultrasonic cleaning to remove impurities such as surface grease, placing the metal anode plate in a fixing machine 1 and performing groove treatment by a surface treatment machine 2, wherein the groove depth range formed during the groove treatment is 0.34 mm;

[0055] S2, take 6 parts by weight of 1,3-propylene glycol and mix with water to make a base liquid, apply part (less than one third) of the base liquid on the surface of the metal anode plate, and form a base film after cooling and solidification. It is worth noting that when applying the base liquid, the groove is first filled, and then a base film with uniform thickness is formed on the surface of the metal anode plate, and the thickness of the base film, that is, the height difference from the lowest point of the groove to the highest point of the base film, is in the range of 0.80 mm;

[0056] S3, mixing the remaining substrate liquid with 18 parts by weight of iridium acetylacetonate, 26 parts by weight of tantalum pentoxide, and 5 parts by weight of dimethyl platinum dichloride to prepare a reaction liquid, and coating the reaction liquid on the substrate film by vacuum evaporation to form a doped film, and the substrate distance range during vacuum evaporation is 25 cm;

[0057] S4. After the doped film layer is extruded to reduce the coating thickness on the surface of the metal anode plate, the deformed overflowed material is sheared off to complete the coating preparation. The unit pressure value range during extrusion is 6mN / m.

[0058] Example 3

[0059] One of the purposes of this embodiment is to provide an iridium-tantalum coating for anode plates of metal electrolysis, comprising 19 parts by weight of iridium acetylacetonate, 5 parts by weight of 1,3-propylene glycol, 30 parts by weight of tantalum pentoxide, and 3 parts by weight of dimethyl platinum dichloride.

[0060] The second purpose of this embodiment is to provide a method for preparing the iridium-tantalum coating for the metal electrolysis anode plate described above, and the specific steps are as follows:

[0061] S1, cleaning the surface of the metal anode plate by ultrasonic cleaning to remove impurities such as surface grease, placing the metal anode plate in a fixing machine 1 and performing groove treatment by a surface treatment machine 2, wherein the groove depth range formed during the groove treatment is 0.50 mm;

[0062] S2, take 5 parts by weight of 1,3-propylene glycol and mix with water to make a base liquid, apply part (less than one third) of the base liquid on the surface of the metal anode plate, and form a base film after cooling and solidification. It is worth noting that when applying the base liquid, the grooves are first filled, and then a base film with uniform thickness is formed on the surface of the metal anode plate, and the thickness of the base film, that is, the height difference from the lowest point of the groove to the highest point of the base film is in the range of 0.40 mm;

[0063] S3, mixing the remaining base liquid with 19 parts by weight of iridium acetylacetonate, 30 parts by weight of tantalum pentoxide, and 3 parts by weight of dimethyl platinum dichloride to prepare a reaction liquid, and coating the reaction liquid on the base film by vacuum evaporation to form a doped film, and the distance range of the substrate during vacuum evaporation is 30 cm;

[0064] S4. After the doped film layer is extruded to reduce the coating thickness on the surface of the metal anode plate, the deformed overflowed material is sheared off to complete the coating preparation. The unit pressure value range during extrusion is 4mN / m.

[0065] Table 1 Comparison of raw material dosage in Examples 1-3

[0066] Example 1 Example 2 Example 3 Iridium acetylacetonate / part 15 18 19 1,3-Propanediol / part 8 6 5 Tantalum pentoxide / part 2 26 30 Dimethylplatinum dichloride / part 7 5 3

[0067] Table 2 Comparison of process parameters in Examples 1-3

[0068] Example 1 Example 2 Example 3 Groove depth / mm 0.17 0.34 0.50 Basement membrane thickness / mm 1.20 0.80 0.40 Distance from substrate / cm 20 25 30 Unit pressure value / (mN / m) 9 6 4

[0069] According to Examples 1-3, an iridium-tantalum coating was prepared on a metal electrolytic anode plate, and the adhesion strength of the iridium-tantalum coating was tested by the "GBT9286-1998 Paint and Varnish Scratch Test", and the test results are recorded in Table 3 (the test results are divided into 0-5 levels, where 0 indicates that the coating is intact and 5 indicates that the coating is severely damaged).

[0070] Table 3 Comparison of adhesion strength of iridium-tantalum coatings prepared in Examples 1-3

[0071] Example 1 Example 2 Example 3 Adhesion strength grade 2 1 2

[0072] It can be seen from Table 3 that the iridium-tantalum coatings prepared in Examples 1-3 all have good adhesion strength, and compared with Example 1 and Example 3, the adhesion strength of the iridium-tantalum coating of Example 2 is higher, and its adhesion strength grade reaches Level 1.

[0073] Example 4

[0074] Please refer to Figure 2 , Figure 3 , Figure 4 As shown, this embodiment provides the fixing machine 1 and the surface treatment machine 2 involved in the above embodiments, wherein:

[0075] The fixing machine 1 comprises a fixing table 11 for placing the metal anode plate, and a fixing structure for fixing the metal anode plate is arranged on the fixing table 11;

[0076] The surface treatment machine 2 includes a groove opening body 21 and an air blowing body 22 connected to the groove opening body 21. The groove opening body 21 and the air blowing body 22 are both slidably connected to the fixed platform 11. The groove opening body 21 is used to groove the metal anode plate, and the air blowing body 22 is used to blow away debris generated during the groove opening. The metal anode plate that has undergone surface pretreatment is placed on the fixed platform 11, and the metal anode plate is fixed by a fixed structure. The groove opening body 21 slides along the fixed platform 11 to groove the metal anode plate, and the air blowing body 22 uses the movement of the groove opening body 21 to inhale gas and then blows the gas toward the surface of the metal anode plate to remove the debris generated during the groove opening.

[0077] like Figure 2 , Figure 3 , Figure 5 As shown, the ditching body 21 includes a top plate 211 and a cross bar 212 plugged with the top plate 211, a groove milling cutter 213 for grooving the surface of the metal anode plate is provided at the bottom of one end of the top plate 211, a third screw 215 and a first motor for driving the third screw 215 are provided on the cross bar 212, the third screw 215 passes through the top plate 211 and is threadedly connected to the top plate 211, the fixing structure includes a fixing frame 12 slidably connected to the fixing platform 11, one end of the fixing frame 12 is threadedly connected to the first screw 121, the first screw 121 is rotatably connected to the fixing platform 11, first displacement grooves 111 are provided at the top of both ends of the fixing platform 11, both ends of the cross bar 212 are located in the first displacement groove 111 and are slidably connected to the first displacement groove 111, a second screw 13 and a second motor for driving the second screw 13 are provided at one end of the top of the fixing platform 11, and the second screw 13 and The air blowing body 22 is threadedly connected. After the metal anode plate is placed on the fixed platform 11, the first screw 121 threadedly connected to the fixed frame 12 is rotated to drive the fixed frame 12 to move on the fixed platform 11 to contact the metal anode plate. The metal anode plate is fixed under the extrusion of the fixed frame 12 and the inner wall of the fixed platform 11. The second motor drives the second screw 13 to rotate, so that the second screw 13 drives the air blowing body 22, and then drives the groove opening body 21 to slide along the first displacement groove 111, so that the groove milling cutter 213 approaches and grooves the surface of the metal anode plate, and when grooved, the first motor drives the top plate 211 to slide left and right along the cross bar 212 through the third screw 215, so that the groove milling cutter 213 opens a number of connected "Z"-shaped grooves on the surface of the metal anode plate. By opening the "Z"-shaped grooves, the iridium-tantalum coating can have good adhesion performance in multiple directions.

[0078] like Figure 5 , Figure 6As shown, the inner walls at both ends of the fixing platform 11 are provided with second displacement grooves 112, the air blowing body 22 includes a control board 221 and an air guide plate 222 arranged at the bottom of the control board 221, both ends of the control board 221 are slidably connected with the second displacement grooves 112, the third screw rod 215 passes through one end of the control board 221, the bottom of both ends of the cross bar 212 are provided with vertical rods 214 plugged with the control board 221, the top plate 211 is provided with a first tail hook 216 at one end away from the groove milling cutter 213, the control board 221 is provided with an empty slot, and the middle of the empty slot is slidably connected to the second displacement groove 112. A sliding plate 2211 is connected, the top of the sliding plate 2211 is slidably connected to the first tail hook 216, air bags 2212 are connected to the two ends of the sliding plate 2211 in the empty slot, the other end of the air bag 2212 is connected to the sliding plate 2211, an air inlet pipe for controlling the one-way flow of gas into the air bag 2212 is provided at the top of the end of the air bag 2212 away from the sliding plate 2211, and an air outlet pipe for controlling the one-way flow of gas out of the air bag 2212 is provided at the bottom of the end of the air bag 2212 away from the sliding plate 2211, and the air outlet pipe is communicated with the air guide plate 222, such as Figure 7 As shown, when the first motor drives the top plate 211 to slide left and right along the cross bar 212 through the third screw 215 during trenching, the top plate 211 slides the sliding plate 2211 through the first tail hook 216, compressing or stretching the airbag 2212. When the airbag 2212 is stretched, air is sucked from the air inlet pipe. When the airbag 2212 is compressed, the internal gas is blown out through the air outlet pipe and then through the air guide plate 222 to clean up the debris. The gas flows to the direction shown in FIG. Figure 7 Indicated by the solid arrow.

[0079] To ensure effective debris removal, Figure 5 , Figure 6 , Figure 8 As shown, a coupling 217 is provided at the bottom of the top plate 211, and a second tail hook 2213 is provided at the bottom of the control plate 221. The control plate 221 is rotatably connected to the air guide plate 222 through the second tail hook 2213. The air guide plate 222 is provided with an air outlet 2221 for blowing out airflow. The air outlet 2221 is connected to the air outlet pipe through a hose 2222. A connecting frame 2223 is provided at the top of the air guide plate 222. The connecting frame 2223 is slidably connected to the coupling 217. By setting a rotating connection, when the top plate 211 slides down along the first displacement groove 111 and the height is reduced, the air guide plate 222 can be driven to rotate relative to the control plate 221 through the slidably connected connecting frame 2223 and the coupling 217, so that the air outlet 2221 is always aligned with the contact position between the groove milling cutter 213 and the metal anode plate, thereby ensuring that the blown airflow can blow away the debris generated during grooving.

[0080] Example 5

[0081] 1,3-Propanediol is used as an auxiliary material in the iridium-tantalum coating to adjust the viscosity and fluidity of the material, affect the drying and curing process of the material, help form a smooth film layer and improve the structural strength of the coating. Dimethyl platinum dichloride can provide platinum elements to enhance the corrosion resistance of the coating. Dimethyl platinum dichloride can also play a catalytic role in the preparation of the coating, helping the material to form a dense and uniform coating structure, thereby ensuring the adhesion performance of the coating.

[0082] In order to determine that 1,3-dipropanol and dimethyl platinum dichloride are one of the important components to ensure the adhesion performance of the iridium-tantalum coating, on the basis of Example 2, only one or more of 1,3-dipropanol or dimethyl platinum dichloride is missing, or 1,3-dipropanol and dimethyl platinum dichloride are replaced by epoxy resin, and the iridium-tantalum coating is prepared on the metal electrolytic anode plate, and the adhesion strength of the iridium-tantalum coating is tested according to "GB / T5210-2006 Paint and Varnish Pull-off Adhesion Test", and the test results are as follows: Fig. 9 shown.

[0083] Depend on Fig. 9 It can be seen that compared with Example 2, when one or more of 1,3-dipropanol or dimethyl platinum dichloride is missing, or 1,3-dipropanol and dimethyl platinum dichloride are replaced by epoxy resin, the adhesion strength of the iridium tantalum coating is significantly reduced. Therefore, 1,3-dipropanol and dimethyl platinum dichloride are one of the important components to ensure the adhesion performance of the iridium tantalum coating.

[0084] Example 6

[0085] Opening grooves on the surface of the metal anode plate can increase the mechanical bite between the coating and the metal substrate. This enhancement of mechanical adhesion is achieved by creating an uneven surface on the metal surface. The grooves can provide more anchor points, allowing the coating to hold the substrate more firmly after curing, and also help increase the chemical bonding between the coating and the metal substrate.

[0086] In order to determine that the groove depth is one of the important components to ensure the adhesion performance of the iridium-tantalum coating, on the basis of Example 2, the groove depth was set to 0.13 mm, 0.25 mm, 0.30 mm, 0.35 mm, and 0.60 mm, and the iridium-tantalum coating was prepared on the metal electrolytic anode plate. The adhesion strength of the iridium-tantalum coating was tested according to "GB / T 5210-2006 Paint and varnish pull-off adhesion test", and the test results are as follows: Fig.10 shown.

[0087] By Fig.10It can be seen that when the groove depth is 0.13mm or 0.60mm, that is, when the groove depth is not 0.17-0.50mm, the adhesion strength is poor. When the groove depth is 0.25mm, 0.30mm, 0.35mm, that is, when the groove depth is 0.17-0.50mm, it has a higher adhesion strength. Compared with 0.25mm and 0.35mm, when the groove depth is 0.30mm, the adhesion strength of the iridium-tantalum coating is higher.

[0088] Example 7

[0089] According to the preferred raw material dosage and the preferred process parameters determined in the above embodiment, an iridium-tantalum coating is prepared on a metal electrolytic anode plate, and the adhesion strength of the iridium-tantalum coating is tested according to the "GBT9286-1998 Paint and Varnish Scratch Test", and the adhesion strength grade of the iridium-tantalum coating is measured to reach Grade 1, that is, the iridium-tantalum coating prepared under the working conditions of this embodiment has strong adhesion, can avoid the coating from falling off, and ensure the corrosion resistance of the anode plate.

[0090] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for preparing an iridium-tantalum coating for anode plates for metal electrolysis, characterized in that: The following steps are involved: S1, after surface pretreatment of the metal anode plate, the metal anode plate is placed in a fixing machine (1) and subjected to groove treatment by a surface treatment machine (2); S2, taking 5-8 parts by weight of 1,3-propylene glycol and mixing with water to prepare a base liquid, coating part of the base liquid on the surface of the metal anode plate, and cooling and solidifying to form a base film; S3, mixing the remaining base liquid with 15-19 parts by weight of iridium acetylacetonate, 22-30 parts by weight of tantalum pentoxide, and 3-7 parts by weight of dimethyl platinum dichloride to prepare a reaction solution, and coating the reaction solution on the base film by vacuum evaporation to form a doped film; S4. After the doped film layer is squeezed to reduce the coating thickness on the surface of the metal anode plate, the deformed and overflowed material is sheared off to complete the coating preparation.

2. The method for preparing an iridium-tantalum coating for anode plates for metal electrolysis according to claim 1, characterized in that: In S1, the surface pretreatment is to clean the surface of the metal anode plate by ultrasonic cleaning, and the depth of the groove formed during the grooving treatment is in the range of 0.17-0.50 mm.

3. The method for preparing an iridium-tantalum coating for anode plates for metal electrolysis according to claim 1, characterized in that: In S1, The fixing machine (1) comprises a fixing table (11) for placing the metal anode plate, and a fixing structure for fixing the metal anode plate is arranged on the fixing table (11); The surface treatment machine (2) comprises a groove opening body (21) and an air blowing body (22) connected to the groove opening body (21); the groove opening body (21) and the air blowing body (22) are both slidably connected to the fixed platform (11); the groove opening body (21) is used to groove the metal anode plate; the air blowing body (22) is used to blow away debris generated during the groove opening; the groove opening body (21) slides along the fixed platform (11) to groove the metal anode plate; the air blowing body (22) uses the movement of the groove opening body (21) to inhale gas and then blows the gas toward the surface of the metal anode plate to remove debris generated during the groove opening.

4. The method for preparing an iridium-tantalum coating for anode plates for metal electrolysis according to claim 3, characterized in that: The groove opening body (21) comprises a top plate (211) and a cross bar (212) plugged into and matched with the top plate (211); a groove milling cutter (213) for groove opening on the surface of the metal anode plate is provided at the bottom of one end of the top plate (211); a third screw rod (215) and a first motor for driving the third screw rod (215) are provided on the cross bar (212); the third screw rod (215) passes through the top plate (211) and is threadedly connected to the top plate (211); the fixing structure comprises a fixing member slidably connected to the fixing platform (11); A fixed frame (12), one end of the fixed frame (12) is threadedly connected to a first screw rod (121), the first screw rod (121) is rotatably connected to the fixed platform (11), the tops of both ends of the fixed platform (11) are provided with first displacement grooves (111), both ends of the cross bar (212) are slidably connected to the first displacement grooves (111), one end of the top of the fixed platform (11) is provided with a second screw rod (13) and a second motor for driving the second screw rod (13), the second screw rod (13) is threadedly connected to the air blowing body (22).

5. The method for preparing an iridium-tantalum coating for anode plates for metal electrolysis according to claim 4, characterized in that: The inner walls of both ends of the fixed platform (11) are provided with second displacement grooves (112); the air blowing body (22) comprises a control plate (221) and an air guide plate (222) arranged at the bottom end of the control plate (221); both ends of the control plate (221) are slidably connected to the second displacement grooves (112); the bottoms of both ends of the cross bar (212) are plugged and matched with the control plate (221); the end of the top plate (211) away from the groove milling cutter (213) is provided with a first tail hook (216); the control plate (221) is provided with an empty groove; the middle part of the empty groove is slidably connected to a sliding plate (216); 211), the top of the sliding plate (2211) is slidably connected to the first tail hook (216), the airbags (2212) are connected to the two ends of the sliding plate (2211) in the empty groove, the other end of the airbag (2212) is connected to the sliding plate (2211), an air inlet pipe for controlling the unidirectional flow of gas into the airbag (2212) is provided at the top of one end of the airbag (2212), and an air outlet pipe for controlling the unidirectional flow of gas out of the airbag (2212) is provided at the bottom of one end of the airbag (2212), and the air outlet pipe is connected to the air guide plate (222).

6. The method for preparing an iridium-tantalum coating for anode plates for metal electrolysis according to claim 5, characterized in that: A coupling shaft (217) is provided at the bottom of the top plate (211), a second tail hook (2213) is provided at the bottom of the control plate (221), the control plate (221) is rotatably connected to the air guide plate (222) via the second tail hook (2213), the air guide plate (222) is provided with an air outlet (2221) for blowing out air, the air outlet (2221) is connected to the air outlet pipe via a hose (2222), a connecting frame (2223) is provided at the top of the air guide plate (222), and the connecting frame (2223) is slidably connected to the coupling shaft (217).

7. The method for preparing an iridium-tantalum coating for anode plates for metal electrolysis according to claim 1, characterized in that: In S2, when coating the base liquid, the grooves are first filled, and then a base film with uniform thickness is formed on the surface of the metal anode plate, and the thickness of the base film ranges from 0.40 to 1.20 mm.

8. The method for preparing an iridium-tantalum coating for anode plates for metal electrolysis according to claim 1, characterized in that: In S3, the distance between the substrate and the vacuum evaporation is in the range of 20-30 cm.

9. The method for preparing an iridium-tantalum coating for anode plates for metal electrolysis according to claim 1, characterized in that: In S4, the unit pressure value during extrusion is in the range of 4-9 mN / m.

10. An iridium-tantalum coating for anode plates of metal electrolysis obtained according to the preparation method according to any one of claims 1 to 9.

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