Steel and iron surface passivating treatment liquid

Abstract

The invention discloses steel and iron surface passivating treatment liquid which contains 1-15% of hydrofluoric acid, 0.1-5% of fluosilicate, 0.1-5% of cerate, 0.1-5% of oxidants, 0.1-5% of sodium benzoate, 0.001-0.5% of dimeric surfactants, 0.001-0.005% of hexamethylenetetramine and the balance of water. Hydrochloric acid is utilized to adjust pH of the treatment liquid to 2-5, the oxidants are at least one of H2O2, sodium peroxide, ammonium persulfate and peracetic acid, and the dimeric surfactants are at least one of dodecyl dimethyl ammonium chloride and myristyl dimethyl ammonium chloride. Coatings formed on the surfaces of steel and iron are smooth, compact and high in stability, generated passivation films are excellent in corrosion resistance, and the treatment liquid is nontoxic, easy to degrade and capable of lowering environment pollution and is an environment-friendly treatment agent.

Description

technical field

[0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a steel surface passivation treatment solution. Background technique

[0002] The output of steel is huge and its application is very wide. There are steel products in every corner of life. However, steel structures are easily corroded in humid atmospheres and polluted environments. The direct loss caused by steel corrosion is mainly manifested in the waste of steel resources and the loss of repeated manufacturing due to corrosion. The indirect losses caused by steel corrosion are mainly manifested in the shutdown of factories, low efficiency and environmental pollution caused by corrosion. The two most commonly used steel anti-corrosion treatment techniques in steel corrosion protection are chromate passivation treatment and phosphating treatment on the steel surface.

[0003] Although, chromate conversion coating has the advantages of dense struct...

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