Stainless steel passivation solution, preparation method and application thereof

By forming a dense passivation film of metal oxides and rare earth metal compounds on the surface of stainless steel, the problem of insufficient corrosion resistance of low-Ni stainless steel without chromium passivating agents is solved, achieving significant improvement in corrosion resistance and environmental friendliness.

CN117684159BActive Publication Date: 2026-05-05GD MIDEA AIR CONDITIONING EQUIP CO LTD +1
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Patent Information

Application Number
CN202311691088.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-12-11
Publication Date
2026-05-05
Estimated Expiration
2043-12-11

AI Technical Summary

Technical Problem

The passivation film formed on the surface of low-Ni stainless steel by existing chromium-free passivating agents has insufficient corrosion resistance and also poses environmental and stability issues.

Method used

This stainless steel passivation solution, containing oxidants and rare earth metal salts, forms a dense passivation film on the stainless steel surface. This film, achieved through the orderly formation of metal oxides and rare earth metal compounds, is produced without chromium. Specifically, this dense passivation film exhibits excellent corrosion resistance. Compared to mainstream silane + resin passivation solutions on the market, this solution significantly improves the corrosion resistance of stainless steel by forming a dense passivation film through the orderly formation of metal oxides and rare earth metal compounds on the stainless steel surface without chromium.

Benefits of technology

Under test environments such as salt spray, pitting, corrosion current, and boiling salt water, its corrosion resistance is significantly improved, exceeding general expectations. It is also environmentally friendly, non-toxic, and easy to operate.

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Abstract

This invention relates to the field of surface treatment technology, providing a stainless steel passivation solution, its preparation method, and its application. The passivation solution comprises an oxidant and a rare earth metal salt. The oxidant forms a metal oxide on the stainless steel surface, and the rare earth metal salt forms a rare earth metal compound on the stainless steel surface. The metal oxide and the rare earth metal compound together constitute a passivation film on the stainless steel surface. This passivation solution forms a dense passivation film on the stainless steel surface in an orderly manner. This passivation film exhibits excellent corrosion resistance, significantly improving upon mainstream silane + resin passivation methods in testing environments such as salt spray, pitting corrosion, corrosion current, and boiling in salt water.
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