Galvanizing inactivating liquid and preparation method

Abstract

The invention discloses a galvanization passivation solution and a preparation method thereof. The components of the passivation solution are that (reagent content in each litre of water): 8 g to 24 g of galvanization colorized passive film powder and 5 ml to 15 ml of nitric acid. 8 g to 24 g of galvanization colorized passive film powder is added with little amount of water and dissolved, then 5ml to 15 ml of nitric acid is added in and mixed with the solution and then water is added to 1 litre. The PH value of the solution is adjusted between 1.0 and 3.8 and the galvanization passivation solution is acquired. The galvanization passivation solution of the invention has extremely low sexavalent chrome content and the cleaning solution can be discharged directly; the passivated liquid is stable, thus being not harmful to operators. By adopting the passivated liquid to carry out surface treatment to galvanized metal, the metal can be ensured to have good corrosion resistance and strongtarnish resisting ability.

Description

Zinc plating passivation solution and preparation method Technical field The invention relates to a metal passivation solution, in particular to a color galvanizing passivation solution and a preparation method thereof. Background technique The alloy layer or galvanized layer of metal parts often needs to be passivated on the surface to increase corrosion resistance and decoration. The method currently used is to passivate the surface of the alloy layer or the galvanized layer with chromic anhydride, sulfuric acid and nitric acid. The chromic anhydride, sulfuric acid and nitric acid triacid passivation solution used in this method has the advantages of thick coating texture and bright color, but due to the large consumption of chromic acid, the toxic hexavalent chromium content in the cleaning water is high and cannot be directly Discharge, and sewage treatment is difficult. Due to the strong volatility of chromic acid and the toxicity of hexavalent chromium in the volatile ...

AI Technical Summary

Problems solved by technology

Although the chromic anhydride, sulfuric acid and nitric acid triacid passivation solution used in this method have the advantages of thick coating texture and bright color, due to the large consumption of chromic acid and the high content of toxic hexavalent chromium in the cleaning water, it cannot be directly Discharge, and sewage treatment is difficult

Due to the strong volatility of chromic acid and the toxicity of hexavalent chromium in the volatile gas, it is harmful to the health of operators. At the same time, the passivation film formed on the metal surface with tri-acid passivation solution has poor anti-corrosion performance and anti-color change ability.