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Trivalent chromium black zinc passivator

A passivation agent, trivalent chromium technology, applied in the direction of metal material coating process, can solve the problems of waste water treatment trouble, loose passivation film, poor appearance, etc., to improve product yield, simple sewage treatment, reduce The effect of production costs

Inactive Publication Date: 2018-05-04
江门市高信科技有限公司
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Problems solved by technology

However, the quality of the black zinc passivators in the trivalent chromium passivation solutions for electroplating zinc on the market is uneven, and generally there are the following disadvantages: poor appearance, loose passivation film, no corrosion resistance (neutral salt spray resistance) White rust test for 8-24 hours); using metal blackening agent, waste water treatment is troublesome, and the cost is increased; the passivation solution is unstable after opening the tank, the production fluctuates greatly, and the product yield is low

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  • Trivalent chromium black zinc passivator

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Embodiment Construction

[0010] A kind of trivalent chromium black zinc passivator of the present invention comprises the following components by mass ratio: (film-forming agent) main salt 10-20 parts, accelerator 5-15 parts, complexing agent 10-20 parts , 50-60 parts of pure water, 0.1-5 parts of sodium hydroxide. The trivalent chromium black zinc passivator also includes a blackening agent composed of 15-25 parts of organic sulfide, 5-10 parts of sealing agent and 65-80 parts of water. The main salt is one of chromium nitrate, chromium sulfate, chromium chloride or chromium oxalate. The accelerator is one of cobalt nitrate, sodium nitrate or potassium nitrate. The complexing agent is one of formic acid, oxalic acid, malic acid, citric acid, sodium fluoride, hydrofluoric acid or ammonium fluozirconate. During film formation, organic sulfides are introduced, and organic sulfides can be blackened by one or more of sodium thioglycolate, sodium polysulfide or sodium sulfide, and finally pass through th...

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Abstract

The invention discloses a trivalent chromium black zinc passivator. The trivalent chromium black zinc passivator comprises the following components, by mass, 10-20 parts of main salt, 5-15 parts of anaccelerant, 10-20 parts of a complexing agent, 50-60 parts of pure water and 0.1-5 parts of sodium hydroxide. The trivalent chromium black zinc passivator has the advantages that a steel part can beassisted in obtaining an excellent trivalent chromium black passivation film after being subjected to electrogalvanizing so that the corrosion resistance of the passivation film can be high, hexavalent chromium is not contained, the sewage treatment is simple, treatment can be carried out according to trivalent chromium sewage, and therefore effective reuse can be realized, the production cost canbe lowered, and the product yield can be improved.

Description

technical field [0001] The invention relates to a passivator in the field of electroplating, in particular to a trivalent chromium black zinc passivator. Background technique [0002] Steel parts are usually passivated after electro-galvanizing. The trivalent chromium black zinc passivator for electro-galvanizing has good appearance and corrosion resistance, and the output of various enterprises is increasing day by day. However, the quality of the black zinc passivators in the trivalent chromium passivation solutions for electroplating on the market is uneven, and generally there are the following disadvantages: poor appearance, loose passivation film, no corrosion resistance (neutral salt spray resistance) White rust test for 8-24 hours); using metal blackening agent, waste water treatment is troublesome, and the cost is increased; the passivation solution is unstable after opening the tank, the production fluctuates greatly, and the product yield is low. Contents of the...

Claims

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Application Information

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IPC IPC(8): C23C22/46C23C22/34C23C22/53C25D5/48
CPCC23C22/46C23C22/34C23C22/53C23C2222/10C25D5/48
Inventor 叶程辉
Owner 江门市高信科技有限公司
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