Method for preparing of composition for surface treatment of metal, surface-treated steel sheet using same and method for manufacturing same

Abstract

The present invention relates to a method for preparing a composition for the surface treatment of metal, a surface-treated steel sheet which is surface-treated with the composition and to a method for manufacturing the surface-treated steel sheet. To accomplish the objective, the method of the present invention may involve the preparing of a composition for the surface treatment of metal using graphene having superior characteristics such as corrosion resistance, electrical conductivity and thermal conductivity. The composition may be effectively coated onto the metal surface by means of electrophoresis, and thus a highly functional surface-treated steel sheet can be obtained.

Description

technical field [0001] The present invention relates to a method for manufacturing a composition for metal surface treatment, a surface-treated steel plate subjected to surface treatment using the composition, and a method for manufacturing the same. Background technique [0002] Typically, the steel panels used in the body of a car are phosphated and painted after the car company assembles the body. In this case, there are several places where the steel plates overlap in the assembled vehicle body, and it is difficult for phosphate or paint to penetrate into the overlapping parts, so there is a problem that the corrosion resistance becomes weak. [0003] In order to solve this kind of problem, it was previously adopted a plan to cut off the access of corrosion factors to this part by sealing the overlapping part of the steel plate. However, such a proposal brings about a problem of lowering the productivity of the final product and increasing the cost. Therefore, a surface...

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Problems solved by technology

[0005] However, in order to manufacture a coated steel sheet, the base steel sheet is dipped into a plating solution containing a large amount of some oxide-forming elements such as Zn, Al, or Mg, and manufactured. At this time, since the oxide-forming elements diffuse to the base steel sheet and Oxide is formed on the surface, resulting in degradation of coating performance, etc., and the problem that the resulting coating is peeled off

[0006] Furthermore, the surface-treated steel sheet with an organic thin film layer has the advantage of ensuring corrosion resistance even in parts that have not been phosphate-treated and painted, but there is a problem that the resistance weldability decreases due to the thickness of the organic thin film layer

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