Technique for preparing trivalent chromium white deactivation liquid

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:...

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, b...