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Passivation formula of zincification trivalent chromium

A passivation solution and trivalent chromium technology, applied in the direction of metal material coating process, etc., can solve the problems of poor corrosion resistance of passivation film, low lifespan of passivation solution, unstable product quality, etc., and achieve excellent corrosion resistance and performance. stable effect

Inactive Publication Date: 2012-02-01
贵阳华科电镀有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing trivalent chromium passivation process has defects such as unstable product quality, short passivation solution life, difficult control of the passivation process, and poor corrosion resistance of the passivation film.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0007] Example 1 of the present invention. Zinc plating trivalent chromium passivation solution, by weight, including the following substances, Cr(NO 3 ) 3 5-15 parts, cobalt nitrate 3-5 parts, phosphate 1-3 parts, nitric acid 1.5-5 parts, boric acid 2-10 parts, citric acid 1-10 parts, malonic acid 2-8 parts, malic acid 1- 5 servings. Add the above-mentioned raw materials into 1000 parts of water to prepare a passivation solution, adjust the PH value of the passivation solution to 1.8-2.3, and pass the electroplating product through the following process, pre-treatment-galvanizing-countercurrent washing-light out-countercurrent washing-trivalent passivation Chemical-countercurrent washing-sealing-drying; wherein the passivation temperature is 30-50℃, and the time is 30-60 seconds.

[0008] Example 2 of the present invention. For zinc plating trivalent chromium passivation solution, a better solution is to add Cr(NO 3 ) 3 8-12 parts, 4 parts cobalt nitrate, 2 parts phosphate, 3 ...

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PUM

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Abstract

The invention discloses a passivation solution of zincification trivalent chromium, which is characterized in that: the formula comprises the following components in parts by weight: 35-15 of Cr (NO3), 3-5 of cobalt nitrate, 1-3 of phosphate, 1.5-5 of nitric acid, 2-10 of boric acid, 1-10 of citric acid, 2-8 of malonic and 1-5 of malic acid. By adopting trivalent chromium for passivation, the invention is more environmental-friendly, after the applicant does experiments, the parameters such as passivation temperature, pH, time and the like can be controlled well by the formula of the invention, and good trivalent chromium passivation film with stable property and corrosion resisting can be obtained, which completely meets ROHS standards. In electroplating products, white rust resistance neutral salt spray test is for 72 hours, and red rust resistance neutral salt spray test is more than 240 hours.

Description

Technical field [0001] The invention relates to a trivalent chromium passivation solution for zinc plating, and belongs to the technical field of zinc plating passivation treatment. Background technique [0002] Steel parts are usually passivated after electro-galvanizing or hot-dip galvanizing to prevent white rust from being generated in a short time. The color passivation process can form a color passivation film on the galvanized layer, which is not only beautiful but also has an excellent anti-corrosion effect. Traditional hexavalent chromium color passivators cause serious pollution to the environment. With the strict requirements of many countries on environmental protection standards, the electroplating industry increasingly uses trivalent chromium passivators. However, the existing trivalent chromium passivation process has defects such as unstable product quality, low passivation liquid life, difficult control of the passivation process, and poor corrosion resistance o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/27C25D3/22C23C2/06
CPCC23C2222/10
Inventor 谭润清葛黔峰张相志袁丽红魏雯
Owner 贵阳华科电镀有限公司