CN102953093B - Cathode plate anticorrosive coating for zinc electrowinning and preparation method of cathode plate anticorrosive coating - Google Patents
Cathode plate anticorrosive coating for zinc electrowinning and preparation method of cathode plate anticorrosive coating Download PDFInfo
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- CN102953093B CN102953093B CN201210438286.2A CN201210438286A CN102953093B CN 102953093 B CN102953093 B CN 102953093B CN 201210438286 A CN201210438286 A CN 201210438286A CN 102953093 B CN102953093 B CN 102953093B
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Abstract
The invention provides a cathode plate anticorrosive coating for zinc electrowinning and a preparation method of the cathode plate anticorrosive coating. The method comprises the step of coating anticorrosive paints on a part between a liquid level line which is easy to corrode of the cathode plate and a conductive beam by means of spraying or blade coating, wherein the anticorrosive paints consist of a base layer, an intermediate layer and a surface layer, the base layer is epoxy modified paint with excellent binding force with base material of the cathode plate, the intermediate layer is anticorrosive paint which is used for connecting the base coat with the finishing coat and has excellent corrosion resistance performance, and the surface layer is anticorrosive and wearable finishing coat. By using the anticorrosive coating, the service life of the cathode plate can be obviously prolonged by 1/3-1/2, and the replacing frequency of aluminum plates is reduced, so that the production cost of electrowinning zinc is reduced, and the production benefit is improved.
Description
Technical field
The present invention relates to a kind of Zinc electrolysis negative plate corrosion protection coating and preparation method thereof, belong to hydrometallurgical technology and technical field of surface.
Technical background
Zinc electrolysis negative plate refers to fine aluminium calendering plate.The principle of zinc electrolysis deposition is: with pure solution of zinc sulfate for electrolytic solution, take pb-ag alloy as positive plate, and fine aluminium calendering plate is negative plate, under galvanic effect, in solution, the zine ion of positively charged is to movable cathode, and in cathodic discharge deposition, its reaction is:
Zn
2++ 2e → Zn ↓ (cathodic reaction)
And electronegative ion anode moves in solution, and in anode discharge deposition, its reaction is:
2OH
--2e → H
2o+1/2O
2↑ (anodic reaction)
The net reaction of solution of zinc sulfate electrolytic deposition is:
In Zinc hydrometallurgy process, during zinc electrolysis, the major part of negative plate and positive plate is all immersed in zinc solution, but the above position of liquid level line is exposed outside solution, the existence being in some impurity in the higher Working environment of acid concentration and zinc solution for a long time causes the exposed partial corrosion of negative plate comparatively serious, when even plate face is also substantially intact, exposed position heavy corrosion, cause plate can not be used by continuation, reduce the work-ing life of plate, wherein to aluminium sheet infection maximum be chlorion and fluorion, due to the diversification of electrolytic zinc raw material in recent years, chlorine/the fluorion in solution is caused to exceed standard, aluminium negative plate extent of corrosion is caused to aggravate, therefore aluminium negative plate how is improved, the corrosion resistance nature at especially exposed position more than liquid level line, increase the work-ing life of aluminium sheet, become problem demanding prompt solution.
Chinese patent [CN2887892Y] proposes and is coated with the method for one deck preservative coat to extend the corrosion resistance nature of electrolytic zinc negative and positive machine plate at the negative plate of zinc by wet method and the plate neck surface of positive plate, but be only coated with one deck epoxy resin or heatproof impregnating material, prolongs life is partially short, and average energy extends 60 days.[CN201495302U] discloses a kind of preparation method of electrolytic zinc anode plate, propose to adopt the exposed position on the electrolyte in pole plate upper end that bar is seemingly installed, anticorrosion bar synthetic materials described in it is made, be arranged on pole plate top to damage because of the corrosion by severe gas, thus can be extended the work-ing life of negative plate.[CN101781780B] proposes a kind of method improving corrosion resistance of cathode aluminum plate for zinc electrolysis, it adopts special ROLLING OIL, two rollers of utilization routine are irreversible, intermittent type milling train is rolled aluminium, process water glass is adopted to allow you carry out subsequent disposal in the industry after rolling immediately, obtain the aluminium negative plate of surfacing, and generate thickness more greatly, comparatively fine and close oxide surface layer, thus improve its corrosion resistance nature.Make improve more than three times its work-ing life.United States Patent (USP) [US005498322A] proposes makes zinc electrolysis negative plate with aluminium alloy, by adding the elements such as magnesium, silicon, iron, copper, zinc, thus adopt cold rolling method to be rolled plate, thus obtained aluminium alloy plate, the aluminium sheet of gained improves corrosion resistance, thus extends the work-ing life of negative plate.Aluminium is more active metal, is very easily corroded, especially the exposed part outside liquid level line of cathode plate for electrolyzing zinc, previously mentioned anti-corrosion method, clear and definite all not, operating procedure relative complex.
Summary of the invention
The present invention proposes corrosion-resistant finishes of a kind of zinc electrolysis negative plate and preparation method thereof, by applying one deck protective system at liquid level line to the position of conducting beam, increasing the antiseptic property at this position, thus the work-ing life of aluminium negative plate can be extended 1/2 ~ 1/3.Can improve the preservative coat of aluminium negative plate resistance to corrosion, the real work-ing life extending negative plate, and operating procedure is simple, can realize mass production.
Object of the present invention is achieved through the following technical solutions:
A preparation method for Zinc electrolysis negative plate corrosion protection coating, step is as follows:
(1) cathode plate surface process: first sandblasting is carried out on anticathode plate surface, then alkali cleaning and pickling, with remove cathode plate surface greasy dirt and oxide film increase the roughness in plate face;
(2) spray: at cathode plate surface first sprayed layer undercoat coating, then 60 DEG C of air dry oven bakings are placed in, after priming paint parches completely, spraying intermediate layer coating, still be placed in 60 DEG C of air dry oven bakings, after intermediate layer coating solidification, continue spraying top layer finish paint, then be placed in 60 DEG C of air dry ovens and be baked to coating and solidify completely.
As priority scheme of the present invention, such scheme also can do following design:
The sandblasting of step (1) described cathode plate surface, adopts the mode of dry spray to improve the roughness of cathode plate surface.
Step (1) described alkali cleaning alkali used is the sodium hydroxide solution of volumetric concentration 6% ~ 8%, and pickling acid used is the salpeter solution of volumetric concentration 15% ~ 20%.
Described bottom is epoxide modified paint is epoxy zinc chromate primer or epoxy bisphenol type epoxy coating; Middle layer is furans, Vinylite adds glass flake or organic-silicon-modified resin; Top layer is acroleic acid polyurethane antisepsis finishing paint or polysiloxane antisepsis finishing paint.
The weight ratio of described priming paint and solidifying agent is 5 ~ 8:1, adopts the mode of spraying to spray 2 roads, coating thickness 100 ~ 200 μm, or adopts the mode of roller coating, blade coating 2 road.
The weight ratio of described middle layer and solidifying agent is 5 ~ 10:1, adopts the mode of spraying to spray 2 roads, coating thickness 200 ~ 400 μm, or adopts the mode of roller coating, blade coating 2 road.
The weight ratio of described top layer finish paint and solidifying agent is 8 ~ 25:2, adopts the mode of spraying to spray 2 roads, coating thickness 200 ~ 300 μm, or adopts the mode of roller coating, blade coating 2 road.
A kind of Zinc electrolysis negative plate corrosion protection coating, is characterized in that: adopt the position coating protective system of the mode of spraying or roller coating between negative plate liquid level line to conducting beam, this protective system is made up of bottom, middle layer and top layer finish paint; Described bottom is the epoxide modified paint with negative plate base material good bonding strength; Described middle layer is for connecting priming paint with finish paint and the relative good protective system of antiseptic property; Described top layer finish paint is anticorrosion antiwear paint.
The corrosion protection coating that the present invention relates to, be coated in the position of liquid level line to conducting beam of cathode for electrolyzing plate, thickness can reach 600 μm ~ 2mm, the mode of spraying or roller coating can be adopted to construct, and operation is simple, easily realizes mass production, effectively can improve the corrosion resistance nature of negative plate, and make extend 1/2 ~ 1/3 the work-ing life of negative plate, decrease the replacement frequency of enterprise's negative plate, great economic benefit can be brought.
Embodiment:
Below in conjunction with example, the technical scheme that the present invention proposes is described further:
Embodiment one:
(1) cathode plate surface process: first adopt the mode anticathode plate surface of dry spray to carry out sandblasting, then be the sodium hydroxide solution alkali cleaning of 6% by volumetric concentration, be the salpeter solution pickling of 15% again by volumetric concentration, with remove cathode plate surface greasy dirt and oxide film etc., and increase the roughness in plate face.
(2) spray: at cathode plate surface sprayed coating protective system.First sprayed layer undercoat coating, priming paint is epoxide modified paint is epoxy zinc chromate primer, and the weight ratio of paint used and solidifying agent is 5:1, adopt the mode of spraying to spray 2 roads, thickness can reach 100 μm, is then placed in 60 DEG C of air dry oven bakings, after coating parches completely, spraying middle layer; Middle layer is furans coating, the weight ratio of itself and solidifying agent is 5:1, adopt the mode of spraying to spray 2 roads, thickness can reach 200 μm, is still placed in 60 DEG C of air dry oven bakings, after paint solidification, continue spray paint, finish paint is acroleic acid polyurethane antisepsis finishing paint, and the weight ratio of paint used and solidifying agent is 8:1, adopt the mode of spraying to spray 2 roads, thickness can reach 200 μm.Be placed in 60 DEG C of air dry ovens to be again baked to coating and to solidify completely.
Embodiment two:
(1) cathode plate surface process: first adopt the mode anticathode plate surface of dry spray to carry out sandblasting, then be the sodium hydroxide solution alkali cleaning of 8% by concentration, with the salpeter solution pickling that bulking value concentration is 20%, with remove cathode plate surface greasy dirt and oxide film etc., and increase the roughness in plate face.
(2) spray: at cathode plate surface sprayed coating protective system.First sprayed layer undercoat coating, priming paint is epoxide modified paint is epoxy zinc chromate primer, and the weight ratio of paint used and solidifying agent is 8:1, adopt the mode of spraying to spray 2 roads, thickness can reach 200 μm, is then placed in 60 DEG C of air dry oven bakings, after coating parches completely, spraying middle layer; Middle layer is organic-silicon-modified cold coating, the weight ratio of itself and solidifying agent is 10:1, adopt the mode of spraying to spray 2 roads, thickness can reach 400 μm, is still placed in 60 DEG C of air dry oven bakings, after paint solidification, continue spraying top layer finish paint, finish paint is polysiloxane antisepsis finishing paint, and the weight ratio of paint used and solidifying agent is 25:2, adopt the mode of spraying to spray 2 roads, thickness can reach 300 μm.Be placed in 60 DEG C of air dry ovens to be again baked to coating and to solidify completely.
Embodiment three:
(1) cathode plate surface process: first adopt the mode anticathode plate surface of dry spray to carry out sandblasting, then be the sodium hydroxide solution alkali cleaning of 7% by volumetric concentration, be the salpeter solution pickling of 17.5% again by volumetric concentration, with remove cathode plate surface greasy dirt and oxide film etc., and increase the roughness in plate face.
(2) spray: at cathode plate surface sprayed coating protective system.First sprayed layer undercoat coating, priming paint is epoxide modified paint is epoxy zinc chromate primer, and the weight ratio of paint used and solidifying agent is 6:1, adopt the mode of spraying to spray 2 roads, thickness can reach 150 μm, is then placed in 60 DEG C of air dry oven bakings, after coating parches completely, spraying middle layer; Middle layer is that Vinylite adds glass flake, the weight ratio of itself and solidifying agent is 7.5:1, adopt the mode of spraying to spray 2 roads, thickness can reach 300 μm, is still placed in 60 DEG C of air dry oven bakings, after paint solidification, continue spraying top layer finish paint, finish paint is polysiloxane antisepsis finishing paint, and the weight ratio of paint used and solidifying agent is 10.5:1, adopt the mode of spraying to spray 2 roads, thickness can reach 250 μm.Be placed in 60 DEG C of air dry ovens to be again baked to coating and to solidify completely.
Embodiment four:
(1) cathode plate surface process: with embodiment 1 ~ 3.
(2) spray: at cathode plate surface sprayed coating protective system.First sprayed layer undercoat coating, the implementing process of bottom protective system is with embodiment 1 ~ 3.Middle layer is organic-silicon-modified resin, the weight ratio of itself and solidifying agent is 6:1, adopt the mode of spraying to spray 2 roads, thickness can reach 250 μm, is still placed in 60 DEG C of air dry oven bakings, after paint solidification, continue spray paint, finish paint is acroleic acid polyurethane antisepsis finishing paint, and the weight ratio of paint used and solidifying agent is 21:2, adopt the mode of spraying to spray 2 roads, thickness can reach 240 μm.Be placed in 60 DEG C of air dry ovens to be again baked to coating and to solidify completely.
Embodiment five:
(1) cathode plate surface process: with embodiment 1 ~ 3.
(2) spray: at cathode plate surface sprayed coating protective system.First sprayed layer undercoat coating, the implementing process of bottom protective system is with embodiment 1 ~ 3.Middle layer is furans, and the weight ratio of itself and solidifying agent is 5:1, and adopt the mode of roller coating to spray 2 roads, thickness can reach 1.0mm, and be still placed in 60 DEG C of air dry ovens bakings, after paint solidification, continue spray paint, the spraying method of finish paint is with embodiment 1 ~ 4.
Embodiment six:
(1) cathode plate surface process: with embodiment 1 ~ 3.
(2) spray: at cathode plate surface sprayed coating protective system.First sprayed layer undercoat coating, the implementing process of bottom protective system is with embodiment 1 ~ 3.Middle layer is that Vinylite adds glass flake, and the weight ratio of itself and solidifying agent is 10:1, adopts the mode of roller coating to spray 2 roads, thickness can reach 1.5mm, is still placed in 60 DEG C of air dry oven bakings, after paint solidification, continue spray paint, the spraying method of finish paint is with embodiment 1 ~ 4.
Embodiment seven:
(1) cathode plate surface process: with embodiment 1 ~ 3.
(2) spray: at cathode plate surface sprayed coating protective system.First sprayed layer undercoat coating, the implementing process of bottom protective system is with embodiment 1 ~ 3.Middle layer is organic-silicon-modified resin, and the weight ratio of itself and solidifying agent is 7.5:1, adopts the mode of roller coating to spray 2 roads, thickness can reach 1.2mm, is still placed in 60 DEG C of air dry oven bakings, after paint solidification, continue spray paint, the spraying method of finish paint is with embodiment 1 ~ 4.
Claims (3)
1. a Zinc electrolysis preparation method for negative plate corrosion protection coating, it is characterized in that, step is as follows:
(1) cathode plate surface process: first sandblasting is carried out on anticathode plate surface, then alkali cleaning and pickling, with remove cathode plate surface greasy dirt and oxide film increase the roughness in plate face;
(2) spray: at cathode plate surface first sprayed layer undercoat coating, then 60 DEG C of air dry oven bakings are placed in, after priming paint parches completely, spraying intermediate layer coating, still be placed in 60 DEG C of air dry oven bakings, after intermediate layer coating solidification, continue spraying top layer finish paint, then be placed in 60 DEG C of air dry ovens and be baked to coating and solidify completely; Described bottom is epoxide modified paint is epoxy zinc chromate primer or epoxy dihydroxyphenyl propane type epoxy coating; Middle layer is furans coating, Vinylite adds glass flake or organic-silicon-modified resin; Top layer is acroleic acid polyurethane antisepsis finishing paint or polysiloxane antisepsis finishing paint;
The weight ratio of described priming paint and solidifying agent is 5 ~ 8: 1, adopts the mode of spraying to spray 2 roads, coating thickness 100 ~ 200 μm, or adopts the mode of roller coating, blade coating 2 road;
The weight ratio of described middle layer and solidifying agent is 5 ~ 10: 1, adopts the mode of spraying to spray 2 roads, coating thickness 200 ~ 400 μm, or adopts the mode of roller coating, blade coating 2 road;
The weight ratio of described top layer finish paint and solidifying agent is 8 ~ 25: 2, adopts the mode of spraying to spray 2 roads, coating thickness 200 ~ 300 μm, or adopts the mode of roller coating, blade coating 2 road.
2. according to the preparation method of the Zinc electrolysis described in claim 1 with negative plate corrosion protection coating, it is characterized in that: the sandblasting of step (1) described cathode plate surface, adopt the mode of dry spray to improve the roughness of cathode plate surface.
3. according to the preparation method of the Zinc electrolysis described in claim 1 with negative plate corrosion protection coating, it is characterized in that: step (1) described alkali cleaning alkali used is the sodium hydroxide solution of volumetric concentration 6% ~ 8%, and pickling acid used is the salpeter solution of volumetric concentration 15% ~ 20%.
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| CN201210438286.2A CN102953093B (en) | 2012-11-06 | 2012-11-06 | Cathode plate anticorrosive coating for zinc electrowinning and preparation method of cathode plate anticorrosive coating |
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| CN106349889A (en) * | 2016-08-29 | 2017-01-25 | 南丹县南方有色金属有限责任公司 | Epoxy vinyl ester micro compound resin and preparing method thereof |
| CN106757177B (en) * | 2016-12-12 | 2018-08-31 | 株洲冶炼集团股份有限公司 | A kind of preparation method of band coating anti-corrosion zinc cathode aluminum plate |
| CN107623100A (en) * | 2017-09-26 | 2018-01-23 | 双登集团股份有限公司 | Negative bus-bar method for anticorrosion treatment built in lead-acid accumulator |
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| CN111441068A (en) * | 2020-05-29 | 2020-07-24 | 云南驰宏资源综合利用有限公司 | Method for manufacturing cathode plate coating for zinc electrodeposition |
| CN111519126A (en) * | 2020-06-19 | 2020-08-11 | 湖南平方科技有限公司 | Preparation method of novel electrolytic zinc cathode plate anticorrosive layer |
| 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 |
| CN112725864A (en) * | 2020-12-18 | 2021-04-30 | 晋宁理工恒达科技有限公司 | Preparation method of long-life aluminum cathode plate |
| CN113770009A (en) * | 2021-09-14 | 2021-12-10 | 云南大泽电极科技股份有限公司 | Liquid level anticorrosion process for negative plate for electrolytic zinc |
| CN114672853B (en) * | 2022-03-07 | 2024-02-09 | 娄底鼎锋金属科技有限公司 | Be used for negative plate liquid level antiseptic treatment equipment |
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