Treating fluid for surface treatment of metal and method for surface treatment

Abstract

The present invention provides surface treatment liquid for a surface treatment capsule, which contains no ingredients that are harmful to the environment, produces no waste sludge, is capable of separating coating on a metal surface, and has excellent corrosion resistance; and the present invention provides a surface treatment method. In particular, the present invention provides metal surface treatment liquid and aqueous surface treatment liquid that can be used for the surface treatment of one or more than two metal materials that are chosen from iron materials, zinc materials, aluminum materials and magnesium materials. The liquid contains metal elements that contain 5ppm to 5000ppm of more than one compound that are chosen from zirconium compounds and titanium compounds, and 0.1ppm to 100 ppm of free fluorion; and the pH value is 2 to 6. Thus the treatment liquid can contain calcium compounds, magnesium compounds or strontium compounds, nitrate, oxyacid and / or oxysalt, polymers and surfactants. The capsule can be formed when a metal material contacts the treatment liquid or is electrolyzed in the liquid.

Description

technical field [0001] The present invention relates to a treatment liquid for surface treatment and a surface treatment method, which are applied to structures containing iron-based materials, zinc-based materials, aluminum-based materials, and magnesium-based materials alone or two to four kinds thereof, represented by automobile bodies. On the surface of metal materials, it is possible to separate the surface treatment film with excellent corrosion resistance after painting alone or two to four kinds of it simultaneously. Background technique [0002] As a method of depositing a surface-treated film excellent in corrosion resistance after painting on the metal surface, zinc phosphate treatment or chromate treatment is generally used at present. Zinc phosphate treatment can deposit a film with excellent corrosion resistance on the surface of steel such as cold-rolled steel sheets, galvanized steel sheets, and some aluminum alloys. However, when zinc phosphate treatment is...

AI Technical Summary

Problems solved by technology

However, similar to the invention disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2000-204485, since the film is formed by coating and drying, it is difficult to apply a uniform film treatment to complex structures such as automobile bodies.

[0007] Therefore, the following surface treatment cannot be performed with the prior art: iron-based materials such as cold-rolled steel sheets such as automobile bodies and galvanized Simultaneous treatment of two to four types of zinc-based materials such as steel sheets, aluminum-based and magnesium-based materials, and surface treatment with excellent corrosion resistance and adhesion

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