Passivating agent for zinc plating and zinc plating passivation method

Abstract

The invention provides a passivating agent for zinc plating and a zinc-plating passivation method. The passivating agent for zinc plating provided by the invention comprises 50-150 parts of chromic salts, 10-50 parts of oxidants, 5-30 parts of film-forming accelerators, 5-30 parts of complexing agents, 5-30 parts of metal salts and 0.1-10 parts of dyestuffs. The dyestuffs comprise one or more of the aniline blue, the methyl blue and the methylene blue. According to the passivating agent for zinc plating and the zinc-plating passivation method, workpieces passivated by the passivating agent have a good appearance.

Description

technical field [0001] The invention belongs to the technical field of electroplating chemistry, and in particular relates to a passivating agent for galvanizing and a galvanizing passivation method. Background technique [0002] Electrogalvanizing is an effective way to improve the corrosion resistance of steel parts, and is widely used in many fields such as construction, transportation, machinery, electronics, and aviation. However, in a humid environment, the galvanized layer is prone to corrosion, causing the surface of the coating to form a dark gray or white loose corrosion product, that is, white rust; after a long time, red rust will appear, thus losing the anti-corrosion effect. In order to improve the corrosion resistance of the coating, it is necessary to electro-galvanize the steel parts and immerse the parts in a passivation solution for passivation treatment to form a dense passivation film on the surface of the galvanized layer, thereby further improving the ...

AI Technical Summary

Problems solved by technology

However, the current trivalent chromium blue passivation technology is immature. The blue color obtained by galvanized trivale

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