CN105200463A - Preparation method of cyanide-free alkaline rack zinc plating solution and electroplating technology - Google Patents
Preparation method of cyanide-free alkaline rack zinc plating solution and electroplating technology Download PDFInfo
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- CN105200463A CN105200463A CN201510738808.4A CN201510738808A CN105200463A CN 105200463 A CN105200463 A CN 105200463A CN 201510738808 A CN201510738808 A CN 201510738808A CN 105200463 A CN105200463 A CN 105200463A
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Abstract
The invention relates to a preparation method of a rack zinc plating solution and an electroplating technology, particularly to a preparation method of a cyanide-free alkaline rack zinc plating solution and an electroplating technology. The method comprises the specific technological processes as follows: (1) preparing zinc oxide; (2) preparing a zinc dissolving bath, and when the content of zinc is 30 g/L, stopping adding zinc oxide to the bath; (3) adding a softener, a brightener, an impurity removing agent, a purifying agent and an anti-scorch bath-making agent. The prepared plating solution contains no cyanide plating solution and is allowed to be used in the temperature range of 20-40 DEG C. During electroplating, bright and attractive plating can be obtained in the wide current density range, the plating thickness is uniform, the dispersing ability is good, the plating is soft, trivalent chromium passivation is easy, machining deformation treatment can be performed after plating, and the plating solution is simple and stable.
Description
Technical field
The present invention relates to a kind of compound method and electroplating technology of plating solution, especially a kind of non-cyanide alkali galvanization liquid preparation and electroplating technology.
Background technology
Plating refers in the saline solution containing pre-metallizing, with plated matrix metal for negative electrode, by electrolytic action, the positively charged ion of pre-metallizing in plating solution is deposited in base metal surface, forms a kind of method of surface finish of coating.Coating performance is different from matrix metal, has new feature.Function according to coating is divided into protective coating, decorative coating and other functional coating, and in order to make electrolytic coating firmly smooth, in industrial production, the formula of electroplate liquid is often very complicated.Conventional prussiate prepared electroplate liquid as complexing agent in the past.But because CN-has severe toxicity, very large to the Health cost of electroplater, meanwhile, discharge is containing sewage, the waste gas also serious environment pollution of CN-.Therefore, present plating mainly uses cyanideless electro-plating.Cyanideless electro-plating does not electroplate containing the electroplate liquid of CN-, without cyanide zinc plating wastewater technique technical knowhow control at formula and current/voltage, formula and technique directly have influence on the thickness of coating, coating with or without the generation of black tooth.
Summary of the invention
The present invention is compound method and zincincation in order to provide a kind of non-cyanide alkali galvanization liquid simple to operate, and thickness of coating can be made even, and coating salt-fog test reaches 72 hours non-corrosives.
Technical solution of the present invention is: the compound method of non-cyanide alkali galvanization liquid and zincincation, raw material and proportioning as follows: preparation zinc oxide, select the zinc oxide of purity more than 90% and sodium hydroxide, first by zinc oxide use water furnishing pasty state, slowly add sodium hydroxide, zinc oxide and sodium hydroxide mass ratio are 1:10-12, and limit edged stirs, until transparent shape; (2) by the burnett's solution after modulation, coating bath is added, until Zn content is 30g/L; (3) in groove, add softening agent 8-15ml/L, brightening agent 8-15ml/L, cleaner 3-6ml/L, scavenging agent 2-4 mg/litre successively, prevent burning open cylinder agent 12-15 mg/litre.
The zincincation of above-mentioned non-cyanide alkali galvanization liquid: add burnett's solution 8-12g/L, sodium hydroxide 110-150g/L in (1) molten zinc groove, limit edged stirs, until transparent shape; (2) by the burnett's solution after modulation, coating bath is added, until Zn content is 30g/L; (3) in groove, add softening agent 8-15ml/L, brightening agent 8-15ml/L, cleaner 3-6ml/L, scavenging agent 2-4 mg/litre successively, prevent burning open cylinder agent 12-15 mg/litre; (4) plating piece is put into coating bath, adjustment electroplating voltage: 7-8V, cathode current density 0.5-5A/dm
2, temperature 20 ~ 40 DEG C, electroplating time is 10 ~ 30min.
Advantage of the present invention:
1, covering power is strong: in traditional technology, general cyanide zinc plating wastewater processing unit affects quality once conduct electricity not good general, hot roller burn is serious, and equipment cost is large, coating luminance brightness is not good, can often there is the black tooth of batch in spoke, covering power is poor, and coating is at least more than 5 microns, and there is black tooth hardly, operation simplification is easy to grasp, and prussiate belongs to highly toxic substance simultaneously, for society and environment be all disturbance factor, therefore high-performance non-cyanide alkali zinc-plated titanium technique has very large social effect.
2, compared with traditional plating process, the situation smog test of coating 5 micron thickness can reach 72 hours non-corrosives.
Embodiment
According to specific embodiment, the present invention will be further described below.
Embodiment 1
In (1) molten zinc groove, add burnett's solution 8g/L, sodium hydroxide 110g/L, limit edged stirs, until transparent shape; (2) by the burnett's solution after modulation, coating bath is added, until Zn content is 30g/L; (3) in groove, add softening agent 8ml/L, brightening agent 8ml/L, cleaner 3ml/L, scavenging agent 2 mg/litre successively, prevent burning open cylinder agent 12 mg/litre; (4) plating piece is put into coating bath, adjustment electroplating voltage: 7V, cathode current density 0.5A/dm
2, temperature 18 DEG C, electroplating time is 10min.
Embodiment 2
In (1) molten zinc groove, add burnett's solution 12g/L, sodium hydroxide 150g/L, limit edged stirs, until transparent shape; (2) by the burnett's solution after modulation, coating bath is added, until Zn content is 30g/L; (3) in groove, add softening agent 15ml/L, brightening agent 15ml/L, cleaner 6ml/L, scavenging agent 4 mg/litre successively, prevent burning open cylinder agent 15 mg/litre; (4) plating piece is put into coating bath, adjustment electroplating voltage: 8V, cathode current density 5A/dm
2, temperature 40 DEG C, electroplating time is 30min.
Embodiment 3
In (1) molten zinc groove, add burnett's solution 12g/L, sodium hydroxide 150g/L, limit edged stirs, until transparent shape; (2) by the burnett's solution after modulation, coating bath is added, until Zn content is 30g/L; (3) in groove, add softening agent 5ml/L, brightening agent 5ml/L, cleaner 6ml/L, scavenging agent 4 mg/litre successively, prevent burning open cylinder agent 15 mg/litre; (4) plating piece is put into coating bath, adjustment electroplating voltage: 8V, cathode current density 5A/dm
2, temperature 40 DEG C, electroplating time is 30min.
Table 1 embodiment polishing effect contrast table
From table 1, we can see, in the process for preparation of plating solution, experiment test through for many years draws, the amount of brightening agent and softening agent must be strict controlled in 8-15ml/L, there will be luminance brightness to decline or coating is spongy when the amount of brightening agent and softening agent is too low, when coating, electroplating temperature is at 20 DEG C, cathode efficiency can be caused too low, coating is made to occur the gentle stream-like of striped, and in the scope of the application's suggestion, carry out the preparation of non-cyanide alkali galvanization liquid and provide electroplating technology to electroplate according to the application, coating light, the situation smog test that can realize coating 5 micron thickness can reach 72 hours non-corrosives.
Although above-described embodiment technical scheme of the present invention describes in detail, but technical scheme of the present invention is not limited to above embodiment, when not departing from thought of the present invention and aim, claims limited range of the present invention all will be fallen into any change that technical scheme of the present invention is done.
Claims (4)
1. the compound method of a non-cyanide alkali rack plating galvanization liquid, it is characterized in that: comprise (1) preparation zinc oxide, select the zinc oxide of purity more than 90% and sodium hydroxide, first by zinc oxide use water furnishing pasty state, slowly add sodium hydroxide, zinc oxide and sodium hydroxide mass ratio are 1:10-12, and limit edged stirs, until transparent shape; (2) by the burnett's solution after modulation, coating bath is added, until Zn content is 30g/L; (3) in groove, add softening agent 8-15ml/L, brightening agent 8-15ml/L, cleaner 3-6ml/L, scavenging agent 2-4 mg/litre successively, prevent burning open cylinder agent 12-15 mg/litre.
2. the compound method of a kind of non-cyanide alkali rack plating galvanization liquid according to claim 1, it is characterized in that: in the burnett's solution modulated in step (1), add 1g/L gac and 2g/L zinc powder, stir after 30 minutes and filter, then low current electrolysis 4 hours.
3. the compound method of a kind of non-cyanide alkali rack plating galvanization liquid according to claim 1, is characterized in that, adds gac 1g/L and hydrogen peroxide 3ml/L in step (3) in electroplate liquid.
4. the technique that a kind of non-cyanide alkali rack plating according to claim 1 is zinc-plated, is characterized in that, in (1) molten zinc groove, add burnett's solution 8-12g/L, sodium hydroxide 110-150g/L, and limit edged stirs, until transparent shape; (2) by the burnett's solution after modulation, coating bath is added, until Zn content is 30g/L; (3) in groove, add softening agent 8-15ml/L, brightening agent 8-15ml/L, cleaner 3-6ml/L, scavenging agent 2-4 mg/litre successively, prevent burning open cylinder agent 12-15 mg/litre; (4) plating piece is put into coating bath, adjustment electroplating voltage: 7-8V, cathode current density 0.5-5A/dm
2, temperature 20 ~ 40 DEG C, electroplating time is 10 ~ 30min.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106222709A (en) * | 2016-08-11 | 2016-12-14 | 桥运精密部件（苏州）有限公司 | A kind of zincincation of rod iron |
| CN110684997A (en) * | 2019-10-10 | 2020-01-14 | 广州三孚新材料科技股份有限公司 | Zinc-plating electroplating liquid and preparation method thereof |
| CN112593173A (en) * | 2020-12-03 | 2021-04-02 | 常州大学 | Silicon-containing steel hot dipping method capable of avoiding silicon reaction |
| CN114808065A (en) * | 2022-03-15 | 2022-07-29 | 兴化市兆泰金属材料有限公司 | Galvanizing treatment process for improving steel adhesion capacity |
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| CN101255581A (en) * | 2007-12-14 | 2008-09-03 | 陈伯荣 | Alkaline chloride galvanizing additive and preparation method thereof |
| EP2038453A2 (en) * | 2006-06-21 | 2009-03-25 | Atotech Deutschland Gmbh | Aqueous alkaline bath, devoid of cyanide, for the deposition of electroplated zinc and zinc alloy coatings |
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| EP2038453A2 (en) * | 2006-06-21 | 2009-03-25 | Atotech Deutschland Gmbh | Aqueous alkaline bath, devoid of cyanide, for the deposition of electroplated zinc and zinc alloy coatings |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106222709A (en) * | 2016-08-11 | 2016-12-14 | 桥运精密部件（苏州）有限公司 | A kind of zincincation of rod iron |
| CN110684997A (en) * | 2019-10-10 | 2020-01-14 | 广州三孚新材料科技股份有限公司 | Zinc-plating electroplating liquid and preparation method thereof |
| CN112593173A (en) * | 2020-12-03 | 2021-04-02 | 常州大学 | Silicon-containing steel hot dipping method capable of avoiding silicon reaction |
| CN114808065A (en) * | 2022-03-15 | 2022-07-29 | 兴化市兆泰金属材料有限公司 | Galvanizing treatment process for improving steel adhesion capacity |
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Address after: 212300 Zhenjiang city of Jiangsu province Danyang Yanling Town South Applicant after: JIANGSU MENGDE NEW MATERIALS TECHNOLOGY CO., LTD. Address before: 212300 Zhenjiang city of Jiangsu province Danyang Yanling Town South Applicant before: JIANGSU MENGDE PLATING CHEMICALS CO., LTD. |
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Application publication date: 20151230 |