Stainless steel passivation treatment method

Abstract

The invention relates to the technical field of stainless steel surface treatment, and particularly relates to a stainless steel passivation treatment method. The stainless steel passivation treatmentmethod comprises the following steps that (A1), a stainless steel product is soaked in an electrolyzing pickling solution for electrolyzing pickling treatment for 3-5 minutes, and then the stainlesssteel product is washed with water; (A2), the stainless steel product treated in the step (A1) is soaked in an electrolysis passivation agent for electrolysis passivation for 3-8 minutes, wherein thecurrent density is 0.05-0.3 A / dm<2> and the temperature is 20-40 DEG C, and then the stainless steel product is washed with water; and (A3), the stainless steel product treated in the step (A2) is soaked in a chromium-free passivation solution for chemical passivation for 3-5 minutes, and then the stainless steel product is washed with water. According to the stainless steel passivation treatmentmethod, the three steps of the electrolyzing pickling, the electrolysis passivation and the chemical passivation are adopted to complete the stainless steel passivation treatment, so that the passivation efficiency is improved, the corrosion risk is greatly reduced, the passivated stainless steel surface is uniform in color and luster, and is brightened.

Description

technical field [0001] The invention relates to the technical field of stainless steel surface treatment, in particular to a stainless steel passivation treatment method. Background technique [0002] Stainless steel materials have strong corrosion resistance and decorative characteristics. Stainless steel products, especially stainless steel workpieces that have been stretched, often have complex structures and many components that need to be welded in order to meet the functional requirements. The metallographic structure of the material changes, and the crystal structure of the material surface is broken or deformed, resulting in a sharp decrease in the corrosion resistance of the tank, especially the welding parts are very prone to corrosion. If no appropriate method is taken for anti-rust treatment, it is easy to pollute the water body in contact with it and affect human health. [0003] At present, the conventional antirust treatment methods for stretched stainless s...

AI Technical Summary

Problems solved by technology

Stainless steel products, especially stainless steel workpieces that have been stretched, often have complex structures and many components that need to be welded in order to meet the functional requirements. The metallographic structure of the material changes, and the crystal structure of the material surface is broken or deformed, resulting in a sharp decrease in the corrosion resistance of the tank, especially the welding part is very prone to rust

If you do not take appropriate methods for anti-rust treatment, it is easy to pollute the water body in contact with it and affect human health.

[0003] At present, the conventional antirust treatment methods for stretched stainless steel workpieces are: 1. Perform electrolytic polishing to improve the corrosion resistance by improving the surface finish of the stainless steel, but this method is costly and the polishing solution contains Phosphorus, the waste liquid after polishing treatment is likely to cause environmental pollution; 2. Using traditional chromic acid passivation or nitric acid passivation, because it belongs to chemical microscopic reaction, the passivation treatment time is usually longer than 30min, and the passivation efficiency is low; 3. In order to prevent the welding parts from rusting, some enterprises use artificial coating of epoxy resin or metal glue. There will be a risk of aging and falling off with prolonged use

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