Trivalent chromium concentrated blue and white zinc passivant and passivation method by means of blue and white zinc passivant

Abstract

The invention belongs to the field of passivation treatment and discloses a trivalent chromium concentrated blue and white zinc passivant. The trivalent chromium concentrated blue and white zinc passivant is prepared from 8-50g / L of chromic chloride, 10-60g / L of aluminium potassium sulfate, 3-10g / L of aluminium potassium sulfate, 3-20g / L of cobalt nitrate, 8-15ml / L of coupling agent, and 0.5-5g / L of rare earth element. The invention further discloses a passivation method by means of the trivalent chromium concentrated blue and white zinc passivant. The passivation method includes a first step of galvanizing the surface of a product, washing the product with water, activating the product with concentrated hydrochloric acid, and washing the product with water, a second step of processing the product by means of the blue and white zinc passivant, washing the product with water, and sealing the product with hot water, and a third step of drying the product. The trivalent chromium concentrated blue and white zinc passivant and the passivation method by means of the trivalent chromium concentrated blue and white zinc passivant are environment-friendly, wide in technology tolerance, easy to operate, good in stability, firm in film formation, little in consumption, and low in cost.

Description

technical field [0001] The invention relates to the field of passivation treatment, in particular to a trivalent chromium concentrated blue-white passivator and a passivation method using the blue-white passivator. Background technique [0002] At present, most of the passivators on the market contain hexavalent chromium, which is not conducive to the protection of the environment. At the same time, the process tolerance is narrow when using this passivator for passivation treatment, heating is required, and there are special requirements for the pH value. The technological process is complicated, and it is not easy to operate and control. At the same time, the finished product has poor stability, and poor corrosion and collision resistance. Contents of the invention [0003] In order to solve the above technical problems, the purpose of the present invention is to provide a more environmentally friendly, wide process tolerance, easy to operate, good stability, fast film f...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the passivators on the market contain hexavalent chromium, which is not conducive to the protection of the environment. At the same time, the process tolerance is narrow when using this passivator for passivation treatment, heating is required, and there are special requirements for the pH value. The process is complex, not easy to operate and control, and the finished product has poor stability, and poor corrosion and collision resistance