Passivating solution and passivating treatment method

Abstract

The invention discloses a passivating solution which consists of the following components: hydrogen peroxide with mass fraction being 0.4%-0.6%, triethanolamine with volume fraction being 0.15%-0.2%, and trisodium phosphate with mass concentration being 2g / L-3g / L. The passivating solution can form a compact passivating film on a metal surface, so that corrosion resistance and rust resistance are achieved, and service life of metal is prolonged.

Description

technical field [0001] The invention relates to metal surface treatment technology, in particular to passivation treatment and passivation solution after metal cleaning. Background technique [0002] Smooth metal surfaces usually require a thin protective film to resist corrosion and rust. Traditionally, passivation solutions that can form passivation films for metals generally include sodium nitrite, hydrazine, polyphosphate, hydrogen peroxide, etc. Among them, hydrogen peroxide belongs to the emerging green passivating agent and is being widely used, but in actual implementation, the passivation film on the metal surface is prone to pitting corrosion and secondary rust, so the corrosion resistance of the passivation film is not ideal. [0003] Therefore, there is an urgent need for an improved passivation solution and passivation method to overcome the above-mentioned defects. Contents of the invention [0004] The purpose of the present invention is to provide a passi...

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Problems solved by technology

Among them, hydrogen peroxide belongs to the emerging green environmental passivation agent and is being widely used, but in actual implementation, the passivation film on the metal surface is prone to pitting corrosion and secondary rust, therefore, the corrosion resistance of the passivation film is not ideal