Surface treating agent for metallic materials, method for surface treating metallic materials using the surface treating agent, and surface treated metallic materials

Abstract

Disclosed is a surface treating agent for metallic materials that can form, on the surface of metallic materials, a novel film, which can simultaneously realize, for example, heat resistance, weldability, continuous processability, electrical conductivity, fingerprint resistance, and coatability, and has excellent liquid stability. The surface treating agent for metallic materials contains a compound (A), which contains in one molecule two or more functional groups (a) represented by -SiR1R2R3 and a hydrophilic functional group (b), in which the molecular weight per functional group (b) (average molecular weight/number of functional groups) is in the range of 300 to 5000, at least one metal alkoxide (B) containing one element selected from the group consisting of Si, Ti, and Zr, at least one compound (C) selected from the group consisting of fluorine-containing compounds and phosphoric acid compounds, organic compounds (D) containing at least one hydrophilic functional group selected from the group consisting of a carboxylic acid group, a phosphonic acid group, and a sulfonic acid group, and water.

Description

technical field [0001] The present invention relates to a surface treatment agent for metal materials for forming a surface treatment agent capable of imparting excellent corrosion resistance to the surface of metal materials such as steel, galvanized steel sheets, and aluminum sheets, and a surface treatment method for metal materials using the same. (especially the corrosion resistance of the bending part) and the coating adhesion of the upper coating (upper coating り), as well as a film that is resistant to chemical agents such as acid resistance and alkali resistance. Background technique [0002] Metal materials represented by galvanized steel sheets are used in various fields such as automobiles, home appliances, and construction materials, but they have a disadvantage of being corroded in the atmosphere to form corrosion products called white rust. Therefore, conventionally, in order to improve corrosion resistance, a method called chromate treatment is generally perf...

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Problems solved by technology

[0009] However, these technologies have the following problems: electrical conductivity and anti-fingerprint properties are obviously lacking; for high-quality products, corrosion resistance and coating adhesion are difficult to achieve the target performance, etc.

[0015] However, in these technologies, since corrosion resistance and fingerprint resistance are expressed by coating the surface of the metal material with an organic resin, there is a problem that performance such as conductivity and spot weldability deteriorates.

In addition, the current situation is that since the main component is an organic polymer, thermal decomposition, coloring, and increased viscosity occur at high temperatures, so that it cannot be used for heat-resistant applications.

[0016] In this way, it is impossible to obtain a chromate film that can be used instead of a chromate film and that satisfies all aspects of corrosion resistance (especially the corrosion resistance of the bent part), chemical resistance, heat resistance, fingerprint resistance, and electrical conductivity. film with various characteristics

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