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Zinc-plated trivalent chromium blue-white passivator

A passivating agent, blue-white technology, applied in the coating process of metal materials, etc., can solve the problems of not meeting the electroplating requirements of ordinary hardware, corrosion resistance and appearance, etc.

Inactive Publication Date: 2012-08-15
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chromium-free passivation systems include titanate, molybdate, tungstate, rare earth, and silicate. Although these chromium-free systems are non-toxic and environmentally friendly, their corrosion resistance and appearance are not as good as those of hexavalent chromium passivation. It cannot meet the electroplating requirements of ordinary hardware, let alone meet the requirements of high corrosion resistance, so the process of chromium-free passivation has never been widely used in industry

Method used

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  • Zinc-plated trivalent chromium blue-white passivator
  • Zinc-plated trivalent chromium blue-white passivator

Examples

Experimental program
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Effect test

Embodiment Construction

[0015] The specific preparation steps of this embodiment are as follows:

[0016] a. Prepare a common low-cyanide zinc plating solution and adjust the pH value for electroplating.

[0017] b. After a certain period of time, take out the sample, and conduct passivation treatment after light exposure in 3% nitric acid. The passivation time is 8-20s.

[0018] c. Observe the color of the conversion coating layer, and conduct a neutral salt spray test.

[0019] A kind of galvanized trivalent chromium blue-white passivating agent process specification is:

[0020]

[0021]

[0022] NOTE: The passivation time can be shortened when there is agitation.

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Abstract

The invention relates to a zinc-plated trivalent chromium blue-white passivator which is prepared by proportionally dissolving and evenly mixing chromium chloride, ammonium fluoride, cobaltous chloride, sodium nitrate and the like. The zinc-plated trivalent chromium blue-white passivator can obviously enhance the corrosion resistance of the plating, and endows the plating with bright and blue-white color.

Description

technical field [0001] The invention relates to a trivalent chromium blue-white passivator for galvanizing, in particular to the composition, function and preparation method of the trivalent chromium blue-white passivator for galvanizing. Background technique [0002] According to GB-2008 "Electroplating Pollutant Discharge Standard", for Pd, Hg, Cd, Cr 6+ , polybrominated diphenyl ethers and polybrominated biphenyls, etc., have lower restrictions on the emission standards of six first-class pollutants. The Directive on Certain Hazardous Substances (ROHs) prohibits six kinds of harmful substances including hexavalent chromium in electronic and electrical equipment put on the EU market. Therefore, it is an urgent requirement to replace hexavalent chromium passivation with environmentally friendly products. [0003] Environmentally friendly passivation mainly adopts two directions of trivalent chromium and chromium-free passivation. Chromium-free passivation systems include ...

Claims

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Application Information

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IPC IPC(8): C23C22/34
Inventor 石磊石璐丹曾琳刘科高李大勇李静
Owner SHANDONG JIANZHU UNIV
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