Method of improving functions of surface of alloy steel by means

Details Method of improving functions of surface of alloy steel by means Method of improving functions of surface of alloy steel by means

1986-06-02

1987-09-08

Silverberg, Sam

Metal treatment

Compositions

Heat treating

148 62, C23C 2250

Patent

active

046921915

ABSTRACT:
A method of improving the functions of the surface of alloy steel by means of the irradiation of a laser beam is disclosed. In this method, the alloy steel is kept in contact with the aqueous solution of oxidizing acid or salt thereof and the irradiation of a laser beam is applied on the surface of the alloy steel through the aqueous solution, thereby concentrating an alloy component on the surface of the alloy steel. The aqueous solution contains at least one selected from the group consisting of nitric acid or nitrate, chromic acid or chromate, or permanganic acid or permanganate. In addition, the irradiation of the laser beam is applied so as to depict a given pattern on the surface, and a computer controls the shape and the size of the beam, the position of the alloy steel, and the like. The present method enables the improvement of a surface function of the alloy steel by providing various kinds of color-patterns.

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