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Technique for preparing trivalent chromium white deactivation liquid

A passivation solution and trivalent chromium technology, 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 achieve 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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Embodiment

[0006] Embodiment: a kind of trivalent chromium white passivation liquid, galvanized piece is immersed in chromic anhydride 40 grams / liter, potassium sodium tartrate 50 grams / liter, sulfuric acid 30ml / liter, nitric acid 10ml / liter, will obtain white passivation film again The galvanized parts are immersed in chromic anhydride 5 g / L, sodium sulfate 1-2 g / L, nitric acid 3-5 ml / L, potassium permanganate 1-1.5 g / L in low chromic acid passivation solution and then passivated. Low chromium iridescent passivation film can be obtained.

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PUM

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Abstract

The invention relates to a trivalent chromium white passivating liquid, wherein, galvanized parts are immersed into chromium trioxide, seignette salt, sulphuric acids and nitric acids; galvanized parts obtaining white passive films are immersed into chromium trioxide, sodium sulfate, sulphuric acids, nitric acids and potassium permanganate low chromic acid passivating liquid; after passivation again, low chromium iridescent passive films can be obtained. 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 scheme of the present invention is: a trivalent chromium white passivation liquid production process, characterized in that: i...

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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