CN111441068A - Method for manufacturing cathode plate coating for zinc electrodeposition - Google Patents
Method for manufacturing cathode plate coating for zinc electrodeposition Download PDFInfo
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- CN111441068A CN111441068A CN202010473404.8A CN202010473404A CN111441068A CN 111441068 A CN111441068 A CN 111441068A CN 202010473404 A CN202010473404 A CN 202010473404A CN 111441068 A CN111441068 A CN 111441068A
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- C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
- C25C1/16—Electrolytic production, recovery or refining of metals by electrolysis of solutions of zinc, cadmium or mercury
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Abstract
The invention relates to a method for manufacturing a cathode plate coating for zinc electrodeposition, which belongs to the technical field of corrosion prevention of a zinc electrodeposition cathode plate, and the method comprises the steps of embossing, cleaning, spraying and drying a first coating, spraying and drying a second coating and injection molding to obtain a double-layer coating cathode plate for zinc electrodeposition, wherein the first coating and the second coating react during drying to prepare a compact coating structure; the coating of the cathode plate prepared by the invention is compact and is firmly combined with the cathode plate, and the service life of the cathode plate is greatly prolonged.
Description
Technical Field
The invention belongs to the technical field of corrosion prevention of zinc electrodeposition cathode plates, and particularly relates to a manufacturing method of a cathode plate coating for zinc electrodeposition.
Background
The negative plate for wet electrodeposition of zinc is a pure aluminum rolled plate, and the positive plate is made of lead-silver alloy or lead-silver multi-element alloy. In the production process, the vast majority of the face of negative plate and anode plate submerges in the zinc sulfate solution in the electrodeposition tank, under the effect of direct current, negative pole, positive pole respectively take place the deposit of discharging, come out the zinc deposit in the zinc sulfate and attach to on the face of negative plate, its electrodeposition's total electrochemical reaction formula is: 2ZnSO4+2H2O=2Zn+2H2SO4+O2During the production process, the zinc cathode aluminum plate is exposed outside the zinc sulfate solution in the electrowinning cell and on the two side ends of the aluminum plate, and is particularly seriously corroded by the action of the sulfuric acid and F, Cl for a long time. Although the surface of the negative plate immersed in the zinc sulfate solution of the electrodeposition tank is basically intact, the negative plate cannot be used continuously due to serious corrosion on the upper part of the plate surface and two side ends of the plate surface, so that the service life of the negative plate is short, and the production cost is increased. Along with the reduction of high-quality zinc concentrate resources, the electro-deposited zinc raw materials are increasingly complex, so that the standard exceeding of fluorine/chloride ions in a zinc sulfate solution is caused, and the greatest factor influencing the corrosion of the negative plate is the fluorine ions, so that the corrosion degree of the negative plate is aggravated.
There have been many studies on the prevention of corrosion of a cathode plate by spray coating. For example, patent CN2887892Y proposes a method for coating an anti-corrosion layer on the surface of the neck of the cathode plate and anode plate for wet-process zinc electrodeposition to prolong the anti-corrosion performance of the cathode plate and anode plate of zinc electrodeposition, and by coating epoxy resin or a temperature-resistant anti-corrosion material, the service life of the electrode plate is prolonged to 60 days on average. Patent CN201495302U discloses a method for preparing an electrodeposited zinc cathode plate, which proposes to install an anti-corrosion strip on the upper end of the cathode plate exposed on the electrodeposited liquid, wherein the anti-corrosion strip is made of synthetic material and is installed on the upper part of the cathode plate without being damaged by corrosion of severe gas, so as to prolong the service life of the cathode plate.
However, the current zinc electrodeposition cathode plate coating has several disadvantages: (1) the service life of the coating is short; (2) the coating is not firmly bonded with the cathode plate and is easy to bulge and fall off; (4) the spraying area is not well controlled, and the problems of missing coating or multiple coating exist. (5) The manufacturing period of the spraying coating is long, and the occupied area is large.
Disclosure of Invention
In order to overcome the problems in the background art, the invention provides a method for manufacturing a cathode plate coating for zinc electrodeposition.
In order to realize the purpose, the invention is realized by the following technical scheme:
the manufacturing method of the cathode plate coating for zinc electrodeposition comprises the following steps:
1) embossing the zinc electrodeposition cathode plate welded with the cathode beam and the conductive head;
2) carrying out alkaline washing and water washing on the embossed zinc electrodeposition by using a negative plate, and then carrying out acid washing and water washing; cleaning the polar plate by using isopropanol after polishing;
3) attaching the clean negative plate for zinc electrodeposition with the pattern beautifying paper, spraying a first layer of coating, drying, spraying a second layer of coating, and removing the pattern beautifying paper;
4) and (3) performing injection molding on the negative plate for zinc electrodeposition by adopting an insulating material to obtain the negative plate for zinc electrodeposition with the coating.
Further, in the step 2), sodium hydroxide solution with the mass concentration of 20-40% is adopted for alkali washing.
Further, in the step 2), a hydrochloric acid solution with the mass concentration of 20-40% is adopted for acid washing.
Further, in the step 2), the isopropanol is industrial grade, the grade is more than or equal to 99.7 percent, the acid content (calculated by acetic acid) is less than or equal to 0.002 percent, the evaporation residue is less than or equal to 0.005 percent, the carbonyl content (calculated by acetone) is less than or equal to 0.02 percent, and the sulfide content (calculated by S) is less than or equal to 2 ppm.
Further, the first coating in the step 3) is bisphenol A novolac epoxy resin.
Furthermore, the drying temperature of the bisphenol A type novolac epoxy resin coating is 30-35 ℃, and the baking time is 0.5-1 h.
Further, the second coating of step 3) is vinyl formic acid.
Furthermore, the drying temperature of the vinyl formic acid coating is 100-.
The invention has the beneficial effects that:
the invention adopts acid washing, alkali washing and isopropanol to comprehensively clean, so that the surface of the polar plate can be cleaned, and the coating and the surface of the polar plate are tightly combined; by adopting the embossing process, the surface roughness of the polar plate can be increased, and the coating and the insulating strip can be effectively prevented from falling off; the coating is more tightly adhered to the surface of the negative plate for zinc electrodeposition, so that the corrosion of electrolyte can be effectively prevented, and the service life of the negative plate for zinc electrodeposition can be prolonged; the masking paper is adhered to the inner sides of the insulating strips on the two sides of the polar plate and below the upper liquid level line, so that when primer and finish paint are sprayed, the masking paper is prevented from being coated on other places, the effective electrodeposition area of the polar plate is prevented from being reduced, and the purpose of improving the electric efficiency is achieved; the invention is divided into two layers of spraying, the coating pieces are combined more tightly, the anti-corrosion function is enhanced, and the service life of the cathode plate for zinc electrodeposition can be prolonged by more than 40%.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, preferred embodiments of the present invention will be described in detail below to facilitate understanding of the skilled person.
A method for manufacturing a cathode plate coating for zinc electrodeposition comprises the following steps:
1) and (4) embossing the zinc electrodeposition cathode plate welded with the cathode beam and the conductive head. The positions are uniformly distributed with pits with the diameter of 0.5-1 mm by adopting an embossing machine, and the interval between every two pits is 0.5-1 mm.
2) Carrying out alkaline washing on the embossed zinc electrodeposition cathode plate by using a sodium hydroxide solution with the mass concentration of 20-40%, and washing with production water after the alkaline washing; then, pickling with a hydrochloric acid solution with the mass concentration of 20-40%, and washing with production water after pickling; and cleaning the polar plate by using isopropanol after polishing.
3) Attaching beautiful grain paper to a cleaned negative plate for zinc electrodeposition, coating a bisphenol A type novolac epoxy resin coating on the first layer, and baking for 0.5-1h at the temperature of 30-35 ℃; and spraying a second vinyl formic acid coating, baking at 100-140 ℃ for 1-4h, and removing the masking paper. The whole baking process is finished in the baking room to ensure that the coating is heated uniformly.
The bisphenol A type novolac epoxy resin coating has good adhesion to metal substrates and excellent mechanical properties. The epoxy group functionality of the resin is more than 2, and the resin has higher crosslinking density and stronger anticorrosion capability, and has good anticorrosion property, chemical resistance, heat resistance (including hot electrolyte resistance) and wear resistance. The drying temperature of the second layer coating is 100-. At the temperature, the bisphenol A novolac epoxy resin of the first coating and the vinyl formic acid of the second coating are subjected to curing and crosslinking reaction to generate vinyl resin. The reaction mechanism is as follows: under the temperature of 100 ℃ and 140 ℃, the vinyl formic acid of the second coating is heated and decomposed to generate free radicals, under the redox condition, the free radicals react with unsaturated carbon-carbon double bonds in the bisphenol A novolac epoxy resin of the first coating firstly, then the living monomers of the vinyl formic acid of the second coating are copolymerized with macromolecular side chain double bonds in the bisphenol A novolac epoxy resin of the first coating preferentially, continuous addition is carried out to enable chains to grow, so that macromolecular free radicals are formed, then the growing free radicals start to react with each other, and finally chain segments are terminated, so that the vinyl resin production is completed. The reaction is divided into three stages: the first stage is a gel stage, namely a first layer of coating bisphenol A type novolac epoxy resin is added into a second layer of coating vinyl formic acid to be changed into a gel state, the gum gradually loses fluidity, and the first stage plays a decisive role in the molding and quality of the vinyl resin; the second stage is a hardening stage, namely a vinyl resin is from a gel state to a molding stage; the third stage is a full curing stage, which is a stage where the vinyl resin becomes completely hard solid. The vinyl resin produced by the process is more uniform and compact in component, and the service life of the negative plate for zinc electrodeposition can be greatly prolonged. The coating can be adhered to the surface of the negative plate for zinc electrodeposition more tightly, can effectively prevent the electrolyte from being eroded, and is favorable for prolonging the service life of the negative plate for zinc electrodeposition.
5) And (3) performing injection molding on the negative plate for zinc electrodeposition by adopting an insulating material to obtain the negative plate for zinc electrodeposition with the coating.
In the step 2), the isopropanol is industrial grade, the grade is more than or equal to 99.7 percent, the acid content (calculated by acetic acid) is less than or equal to 0.002 percent, the evaporation residue is less than or equal to 0.005 percent, the carbonyl content (calculated by acetone) is less than or equal to 0.02 percent, and the sulfide content (calculated by S) is less than or equal to 2 ppm.
In the step 3), the textured paper is single-sided with glue. The masking tape is pasted below the inner side of the insulating strips on the two sides of the negative plate for zinc electrodeposition and the upper liquid level line, so that when the first and second coatings are prevented from being sprayed, the masking tape is coated on other places, and the reduction of the effective electrodeposition area of the polar plate is avoided.
Example 1
And (3) adopting an embossing machine to emboss the positions, which are bonded by insulating strips on two sides of the cathode plate, of the zinc electrodeposition with the cathode beam and the conductive head welded well. The concave points with the diameter of 0.5mm are uniformly distributed at the positions, and the interval between every two concave points is 1mm, so that the coating and the insulating material are favorably fixed on the surface of the cathode plate for zinc electrodeposition.
And (3) carrying out alkali washing on the embossed polar plate by adopting a sodium hydroxide solution containing 20 percent, and washing with production water. Then the mixture is washed by hydrochloric acid solution containing 40 percent and is washed by production water. And then polishing the embossing position to be smooth, and cleaning the polar plate by using isopropanol.
The clean polar plate is pasted with the masking paper, the masking paper is pasted on the inner sides of the insulating strips on the two sides of the polar plate and below the upper liquid level line, and when the first and second coatings are prevented from being sprayed, the first and second coatings are coated on other places, so that the effective electrodeposition area of the polar plate is prevented from being reduced. And then spraying a first layer of coating on the position of the insulating strip and above the liquid level line, and then sending the coating to a baking room to bake for 1h at the temperature of 30 ℃. And then spraying a second coating on the position of the insulating strip and above the liquid level line at the temperature of 28-35 ℃, removing the masking paper, and sending the masking paper to a baking room at the temperature of 100 ℃ for 4 hours. The bisphenol A type novolac epoxy resin of the first coating and the vinyl formic acid of the second coating are subjected to curing and crosslinking reaction to generate vinyl resin.
And finally, performing injection molding on the cathode plate by adopting an insulating material to obtain the qualified cathode for zinc electrodeposition with the coating. The service life of the obtained cathode for zinc electrodeposition with the coating is prolonged to more than 400 days, observation of the replaced cathode plate shows that the coating begins to tilt from the edge, the coating gradually separates from the cathode plate after the edge is corroded, the cathode plate is corroded finally, the coating which does not fall off does not bulge, and the fallen coating is compact and has no layering.
Example 2
And (3) adopting an embossing machine to emboss the positions, which are bonded by insulating strips on two sides of the cathode plate, of the zinc electrodeposition with the cathode beam and the conductive head welded well. The concave points with the diameter of 0.75mm are uniformly distributed at the positions, and the interval between every two concave points is 0.75mm, so that the coating and the insulating material are favorably fixed on the surface of the cathode plate for zinc electrodeposition.
And (3) carrying out alkali washing on the embossed polar plate by adopting a sodium hydroxide solution containing 30 percent, and washing with production water. Then washed with a hydrochloric acid solution containing 30% and then washed with production water. And then polishing the embossing position to be smooth, and cleaning the polar plate by using isopropanol.
The clean polar plate is pasted with the masking paper, the masking paper is pasted on the inner sides of the insulating strips on the two sides of the polar plate and below the upper liquid level line, and when the first and second coatings are prevented from being sprayed, the first and second coatings are coated on other places, so that the effective electrodeposition area of the polar plate is prevented from being reduced. Then, the first coating is sprayed on the position of the insulating strip and above the liquid level line, and then the product is sent to a baking room to be baked for 0.75h at the temperature of 32.5 ℃. And then spraying a second coating on the position of the insulating strip and above the liquid level line at the temperature of 28-35 ℃, removing the masking paper, and sending the masking paper to a baking room to bake at 120 ℃ for 2.5 h. The bisphenol A type novolac epoxy resin of the first coating and the vinyl formic acid of the second coating are subjected to curing and crosslinking reaction to generate vinyl resin.
And finally, performing injection molding on the cathode plate by adopting an insulating material to obtain the qualified cathode for zinc electrodeposition with the coating. The service life of the obtained cathode for zinc electrodeposition with the coating is prolonged to more than 360 days, observation of the replaced cathode plate shows that the coating starts to tilt from the edge, the coating gradually separates from the cathode plate after the edge is corroded, the cathode plate is corroded finally, the coating which does not fall off does not bulge, and the fallen coating is compact and has no layering.
Example 3
And (3) adopting an embossing machine to emboss the positions, which are bonded by insulating strips on two sides of the cathode plate, of the zinc electrodeposition with the cathode beam and the conductive head welded well. The positions are uniformly distributed with pits with the diameter of 1mm, and the interval between every two pits is 0.5mm, which is beneficial to fixing the coating and the insulating material on the surface of the cathode plate for zinc electrodeposition.
And (3) carrying out alkali washing on the embossed polar plate by adopting a sodium hydroxide solution containing 40% and then washing with production water. Then the mixture is washed by hydrochloric acid solution containing 20 percent and then is washed by production water. And then polishing the embossing position to be smooth, and cleaning the polar plate by using isopropanol.
The clean polar plate is pasted with the masking paper, the masking paper is pasted on the inner sides of the insulating strips on the two sides of the polar plate and below the upper liquid level line, and when the first and second coatings are prevented from being sprayed, the first and second coatings are coated on other places, so that the effective electrodeposition area of the polar plate is prevented from being reduced. And then spraying a first layer of coating on the position of the insulating strip and above the liquid level line, and then sending the coating to a baking room to bake for 0.5h at the temperature of 35 ℃. Then, at the temperature of 28-35 ℃, after spraying a second coating layer on the position of the insulating strip and above the liquid level line, removing the masking paper, and sending the masking paper to a baking room to bake for 2.5 hours at the temperature of 120 ℃. The bisphenol A type novolac epoxy resin of the first coating and the vinyl formic acid of the second coating are subjected to curing and crosslinking reaction to generate vinyl resin.
And finally, performing injection molding on the cathode plate by adopting an insulating material to obtain the qualified cathode for zinc electrodeposition with the coating. The service life of the obtained cathode for zinc electrodeposition with the coating is prolonged to more than 380 days, observation of the replaced cathode plate shows that the coating begins to tilt from the edge, the coating gradually separates from the cathode plate after the edge is corroded, the cathode plate is corroded finally, the coating which does not fall off does not bulge, and the fallen coating is compact and has no layering.
Comparative example 1
And (3) adopting an embossing machine to emboss the positions, which are bonded by insulating strips on two sides of the cathode plate, of the zinc electrodeposition with the cathode beam and the conductive head welded well. The positions are uniformly distributed with pits with the diameter of 1mm, and the interval between every two pits is 0.5mm, which is beneficial to fixing the coating and the insulating material on the surface of the cathode plate for zinc electrodeposition.
And (3) carrying out alkali washing on the embossed polar plate by adopting a sodium hydroxide solution containing 40% and then washing with production water. Then the mixture is washed by hydrochloric acid solution containing 20 percent and then is washed by production water. And then polishing the embossing position to be smooth, and cleaning the polar plate by using isopropanol.
The clean polar plate is pasted with the masking paper, the masking paper is pasted on the inner sides of the insulating strips on the two sides of the polar plate and below the upper liquid level line, and when the first and second coatings are prevented from being sprayed, the first and second coatings are coated on other places, so that the effective electrodeposition area of the polar plate is prevented from being reduced. And then spraying a first layer of coating on the position of the insulating strip and above the liquid level line, and then sending the coating to a baking room to bake for 0.5h at the temperature of 35 ℃. Then, at the temperature of 28-35 ℃, after spraying a second coating layer on the position of the insulating strip and above the liquid level line, removing the masking paper, and sending the masking paper to a baking room to bake at the temperature of 95 ℃ for 2.5 hours. And finally, performing injection molding on the cathode plate by adopting an insulating material to obtain the qualified cathode for zinc electrodeposition with the coating. The obtained cathode for zinc electrodeposition with the coating has the service life of about 180 days, and observation of the replaced cathode plate shows that the coating starts to tilt from the edge, the coating gradually separates from the cathode plate after the edge is corroded, the cathode plate is corroded finally, the cathode plate in the middle of the coating area is obviously corroded, the coating which does not fall off has obvious bulge, and the coating is poorly adhered to the cathode plate; the peeled coating is divided into two layers to be tilted, and the bisphenol A type novolac epoxy resin and the vinyl formic acid are not fully reacted and layered.
Comparative example 2
And (3) adopting an embossing machine to emboss the positions, which are bonded by insulating strips on two sides of the cathode plate, of the zinc electrodeposition with the cathode beam and the conductive head welded well. The positions are uniformly distributed with pits with the diameter of 1mm, and the interval between every two pits is 0.5mm, which is beneficial to fixing the coating and the insulating material on the surface of the cathode plate for zinc electrodeposition.
And (3) carrying out alkali washing on the embossed polar plate by adopting a sodium hydroxide solution containing 40% and then washing with production water. Then the mixture is washed by hydrochloric acid solution containing 20 percent and then is washed by production water. And then polishing the embossing position to be smooth, and cleaning the polar plate by using isopropanol.
The clean polar plate is pasted with the masking paper, the masking paper is pasted on the inner sides of the insulating strips on the two sides of the polar plate and below the upper liquid level line, and when the first and second coatings are prevented from being sprayed, the first and second coatings are coated on other places, so that the effective electrodeposition area of the polar plate is prevented from being reduced. And then spraying a first layer of coating on the position of the insulating strip and above the liquid level line, and then sending the coating to a baking room to bake for 0.5h at the temperature of 35 ℃. And then, spraying a second coating on the position of the insulating strip and above the liquid level line at normal temperature, removing the masking paper, and sending the masking paper to a baking room to bake at 95 ℃ for 2.5 hours. And finally, performing injection molding on the cathode plate by adopting an insulating material to obtain the qualified cathode for zinc electrodeposition with the coating. The obtained cathode for zinc electrodeposition with the coating has the service life of about 150 days, and observation of the replaced cathode plate shows that the coating starts to tilt from the edge, the coating gradually separates from the cathode plate after the edge is corroded, the cathode plate is corroded finally, the corrosion of the cathode plate in the middle of the coating area is obvious, the coating which does not fall off has obvious bulge, and the adhesion of the coating and the cathode plate is poor; the coating that has fallen off is lifted in two layers.
Comparative example 3
And (3) adopting an embossing machine to emboss the positions, which are bonded by insulating strips on two sides of the cathode plate, of the zinc electrodeposition with the cathode beam and the conductive head welded well. The positions are uniformly distributed with pits with the diameter of 1mm, and the interval between every two pits is 0.5mm, which is beneficial to fixing the coating and the insulating material on the surface of the cathode plate for zinc electrodeposition.
And (3) carrying out alkali washing on the embossed polar plate by adopting a sodium hydroxide solution containing 40% and then washing with production water. Then the mixture is washed by hydrochloric acid solution containing 20 percent and then is washed by production water. And then polishing the embossing position to be smooth, and cleaning the polar plate by using isopropanol.
The clean polar plate is pasted with the masking paper, the masking paper is pasted on the inner sides of the insulating strips on the two sides of the polar plate and below the upper liquid level line, and when the first and second coatings are prevented from being sprayed, the first and second coatings are coated on other places, so that the effective electrodeposition area of the polar plate is prevented from being reduced. And then spraying a first layer of coating on the position of the insulating strip and above the liquid level line, and then sending the coating to a baking room to bake for 0.5h at the temperature of 35 ℃. Then, at the temperature of 28-35 ℃, after spraying a second coating layer on the position of the insulating strip and above the liquid level line, removing the masking paper, and sending the masking paper to a baking room to bake at 145 ℃ for 2.5 h. And finally, performing injection molding on the cathode plate by adopting an insulating material to obtain the qualified cathode for zinc electrodeposition with the coating. The service life of the obtained cathode for zinc electrodeposition with the coating is about 240 days, and observation of the replaced cathode plate shows that the coating starts to tilt from the edge, the coating gradually separates from the cathode plate after the edge is corroded, the cathode plate is finally corroded, the coating which does not fall off does not bulge, the fallen coating tilts, the reaction temperature of bisphenol A type novolac epoxy resin and vinyl formic acid is too high, generated vinyl resin is aged, and the service life is seriously influenced.
Comparative example 4
And (3) adopting an embossing machine to emboss the positions, which are bonded by insulating strips on two sides of the cathode plate, of the zinc electrodeposition with the cathode beam and the conductive head welded well. The positions are uniformly distributed with pits with the diameter of 1mm, and the interval between every two pits is 0.5mm, which is beneficial to fixing the coating and the insulating material on the surface of the cathode plate for zinc electrodeposition.
And (3) carrying out alkali washing on the embossed polar plate by adopting a sodium hydroxide solution containing 40% and then washing with production water. Then the mixture is washed by hydrochloric acid solution containing 20 percent and then is washed by production water. And then polishing the embossing position to be smooth, and cleaning the polar plate by using isopropanol.
The clean polar plate is pasted with the masking paper, the masking paper is pasted on the inner sides of the insulating strips on the two sides of the polar plate and below the upper liquid level line, and when the first and second coatings are prevented from being sprayed, the first and second coatings are coated on other places, so that the effective electrodeposition area of the polar plate is prevented from being reduced. And then spraying a first layer of coating on the position of the insulating strip and above the liquid level line, and then sending the coating to a baking room to bake for 0.5h at the temperature of 35 ℃. And then, spraying a second coating on the position of the insulating strip and above the liquid level line at normal temperature, removing the masking paper, and sending the masking paper to a baking room to bake at 120 ℃ for 2.5 hours. The bisphenol A type novolac epoxy resin of the first coating and the vinyl formic acid of the second coating are subjected to curing and crosslinking reaction to generate vinyl resin.
And finally, performing injection molding on the cathode plate by adopting an insulating material to obtain the qualified cathode for zinc electrodeposition with the coating. The obtained cathode for zinc electrodeposition with the coating has the service life of about 180 days, and observation of the replaced cathode plate shows that the coating starts to tilt from the edge, the coating gradually separates from the cathode plate after the edge is corroded, the cathode plate is corroded finally, the coating which does not fall off does not bulge, the fallen coating tilts, the reaction temperature of bisphenol A type novolac epoxy resin and vinyl formic acid is too high, and generated vinyl resin is aged.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (8)
1. A method for manufacturing a cathode plate coating for zinc electrodeposition is characterized by comprising the following steps: the manufacturing method of the cathode plate coating for zinc electrodeposition comprises the following steps:
1) embossing the zinc electrodeposition cathode plate welded with the cathode beam and the conductive head;
2) carrying out alkaline washing and water washing on the embossed zinc electrodeposition by using a negative plate, and then carrying out acid washing and water washing; cleaning the polar plate by using isopropanol after polishing;
3) attaching the clean negative plate for zinc electrodeposition with the pattern beautifying paper, spraying a first layer of coating, drying, spraying a second layer of coating, and removing the pattern beautifying paper;
4) and (3) performing injection molding on the negative plate for zinc electrodeposition by adopting an insulating material to obtain the negative plate for zinc electrodeposition with the coating.
2. The method for making a cathode plate coating for zinc electrodeposition according to claim 1, wherein: in the step 2), sodium hydroxide solution with the mass concentration of 20-40% is adopted for alkali washing.
3. The method for making a cathode plate coating for zinc electrodeposition according to claim 1, wherein: in the step 2), a hydrochloric acid solution with the mass concentration of 20-40% is adopted for acid washing.
4. The method for making a cathode plate coating for zinc electrodeposition according to claim 1, wherein: in the step 2), the isopropanol is industrial grade, the grade is more than or equal to 99.7 percent, the acid content (calculated by acetic acid) is less than or equal to 0.002 percent, the evaporation residue is less than or equal to 0.005 percent, the carbonyl content (calculated by acetone) is less than or equal to 0.02 percent, and the sulfide content (calculated by S) is less than or equal to 2 ppm.
5. A method of making a cathode plate coating for zinc electrodeposition as in any of claims 1 to 4 wherein: and 3) the first coating is bisphenol A novolac epoxy resin.
6. A method of making a cathode plate coating for zinc electrodeposition as claimed in claim 5 wherein: the drying temperature of the bisphenol A type novolac epoxy resin coating is 30-35 ℃, and the baking time is 0.5-1 h.
7. A method of making a cathode plate coating for zinc electrodeposition as claimed in claim 5 wherein: step 3) the second coating is vinyl formic acid.
8. The method for making a cathode plate coating for zinc electrodeposition according to claim 7, wherein: the drying temperature of the vinyl formic acid coating is 100-140 ℃, and the baking time is 1-4 h.
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| CN (1) | CN111441068A (en) |
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| CN112626569A (en) * | 2020-12-01 | 2021-04-09 | 云南漫风鸟科技有限公司 | Corrosion prevention process of electrolytic zinc cathode aluminum plate for zinc smelting |
| CN113459707A (en) * | 2021-04-01 | 2021-10-01 | 江苏万源新材料股份有限公司 | Embossed molecular sieve coating aluminum foil for VOCs (volatile organic compounds) rotating wheel and special embossing equipment thereof |
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| CN112626569A (en) * | 2020-12-01 | 2021-04-09 | 云南漫风鸟科技有限公司 | Corrosion prevention process of electrolytic zinc cathode aluminum plate for zinc smelting |
| CN113459707A (en) * | 2021-04-01 | 2021-10-01 | 江苏万源新材料股份有限公司 | Embossed molecular sieve coating aluminum foil for VOCs (volatile organic compounds) rotating wheel and special embossing equipment thereof |
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