Metallic material having chromate-free-treated surface excellent in corrosion resistance, heat resistance, anti-fingerprint property, conductivity, coating property and black deposit resistance during

Abstract

Disclosed is a metallic material having a chromate-free-treated surface which satisfies all of corrosion resistance, heat resistance, anti-fingerprint property, conductivity, coating property and black deposition resistance during processing which have been difficult to overcome by conventional chromate-free techniques. The metallic material comprises a metallic material and a composite coating film formed on the surface of the metallic material. The composite coating film is formed by coating an aqueous metal surface treatment agent on the surface of the metallic material and then drying theagent. The aqueous metal surface treatment agent comprises: an organic silicon compound (W) produced by compounding a silane coupling agent (A) having one amino group in the molecule with a silane coupling agent (B) having one glycidyl group in the molecule at a ratio [(A) / (B)] of 0.5 to 1.7 by mass in terms of solid content; at least one fluoro compound (X) selected from titanium hydrofluoride and zirconium hydrofluoride; phosphoric acid (Y); and a vanadium compound (Z), and the composite coating film contains all of the components (W), (X), (Y) and (Z).

Description

Non-chromate surface-treated metal material with excellent corrosion resistance, heat resistance, fingerprint resistance, electrical conductivity, paintability, and blackening resistance during processing technical field The present invention relates to a non-chromate surface-treated metal material that is excellent in corrosion resistance, heat resistance, fingerprint resistance, electrical conductivity, paintability, and black deposition resistance during processing. Background technique Generally, as a technique for imparting corrosion resistance or fingerprint resistance to the surface of a metal material with excellent adhesion to the surface of a metal material, the following method is known: using a material containing chromic acid, dichromic acid, or a salt thereof as a main component A method of chromate treatment, a method of phosphate treatment, a method of using a silane coupling agent monomer, a method of organic resin film treatment, etc. on the surface of met...

AI Technical Summary

Problems solved by technology

However, the above-mentioned technologies cannot satisfy all properties such as corrosion resistance, heat resistance, fingerprint resistance, electrical conductivity, and blackening resistance during processing, and there are still problems in practical application.

Therefore, the current situation is that no surface treatment agent that can replace the chromate film can be obtained in any method, so the development of a surface treatment agent and a treatment method that can comprehensively satisfy the above-mentioned properties is strongly demanded.