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Technique for preparing trivalent chromium white deactivation liquid

A passivation solution and trivalent chromium technology, which is applied in the field of trivalent chromium white passivation solution production process, can solve the problems of easy falling off, environmental pollution, affecting workers' health, etc., and achieves safe operation, strong corrosion resistance, stability and no The effect of pungent odors

Inactive Publication Date: 2008-06-04
TIANJIN HANLONG ZINC PLATING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in order to solve the problem that the existing galvanized white passivation process rainbow color flag bleaching affects the health of workers and causes environmental pollution, low chromic acid is used for passivation, but the passivation solution needs to be adjusted frequently, and the passivation solution will be aged and passivated. The chemical film is not bright, foggy, easy to fall off, has low anti-corrosion and decorative value, and cannot be widely used

Method used

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Examples

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Embodiment

[0006] Embodiment: A kind of trivalent chromium white passivation solution, under normal temperature and pressure, add 60 grams / liter of chromic anhydride and stir to dissolve, add potassium sodium tartrate 60 grams / liter, stir and dissolve reaction, leave several hours, stir, pH value is 4 Between -5, add sulfuric acid 50ml / liter, stir evenly, let it stand for several hours, immerse the galvanized parts with semi-brightness or above in the passivation solution for 5-23 seconds, wash with water, and dry.

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PUM

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Abstract

The invention relates to a trivalent chromium white passivating liquid, wherein, under normal temperature and pressure, water is added into chromium trioxide for mixture and dissolution; seignette salt is added into mixture for stirring, dissolution and reaction; the mixture is kept for a plurality of hours and then stirred; when PH value is between 4 and 5, sulphuric acids are added into the mixture for even stirring; the mixture is kept for a plurality of hours; galvanized parts with over half brightness are immersed into the passivating liquid; the trivalent chromium white passivating liquid is obtained after washing by clear water and drying. The invention has the advantages of capability of directly exhausting cleaning water after passivation, stable nonirritant odor, safe operation and strong corrosion resistance.

Description

technical field [0001] The invention relates to a process for preparing a trivalent chromium white passivation solution. Background technique [0002] At present, in order to solve the problem that the existing galvanized white passivation process rainbow color flag bleaching affects the health of workers and causes environmental pollution, low chromic acid is used for passivation, but the passivation solution needs to be adjusted frequently, and the passivation solution will be aged and passivated. The chemical film is not bright, foggy, easy to fall off, and has low anti-corrosion and decorative value, so it cannot be widely used. Contents of the invention [0003] The object of the present invention is to overcome above-mentioned defect, a kind of trivalent chromium white passivation liquid production process is provided. [0004] The technical solution of the present invention is: a trivalent chromium white passivation liquid production process, characterized in that:...

Claims

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Application Information

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IPC IPC(8): C23C22/53
Inventor 刘贵喜
Owner TIANJIN HANLONG ZINC PLATING
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