Metal treatment – Compositions – Heat treating
Patent
1985-08-23
1987-04-28
Silverberg, Sam
Metal treatment
Compositions
Heat treating
C23C 818
Patent
active
046611711
ABSTRACT:
This disclosure is concerned with a method for treating a stainless steel surface by high temperature oxidation. The surface of a stainless steel article is cleaned. TiO.sub.2 and SiO.sub.2 are mixed in microparticles to form a coating agent, and water is added to the mixture to make a slip. The slip is coated on the steel surface to form a coating having a uniform thickness. The coating is dried and the article is subjected to a heat-treatment to form an oxide film. This treatment is performed in an oxidizing atmosphere for a time and a temperature suitable for the color tone to be produced. A desirable temperature for the heat-treatment is between 350.degree. C. to 700.degree. C. When a coating agent is used, it is later removed by washing, etc. after cooling the article.
Further, when less dissolution of iron from the stainless steel surface is required, a decolorization treatment is applied; that is, the colored oxide film is removed from the surface by dissolution using an acid or an electrolytic treatment.
REFERENCES:
patent: 1982179 (1934-11-01), Scharscher
patent: 2978361 (1961-03-01), Seidl
patent: 3125471 (1964-03-01), Conner
patent: 3437532 (1969-04-01), Helgert
patent: 3556871 (1971-01-01), Helgert
patent: 3968313 (1976-07-01), Perlman
patent: 4078949 (1978-03-01), Boggs
J. Electrochemical Tech., Bombara, Apr. 1971, pp. 676-631.
Patent Abstracts of Japan, unexamined applications, C field, vol. 4, No. 173, Nov. 29, 1980, The Patent Office Japanese Govt., p. 58 C 32; Kokai No. 55-110 783 (Sumitomo Kinzoku Kogyo K.K.) relevant to claims 1-3.
Goto Shigeo
Hata Tomihira
Shibata Mitsuaki
Takahashi Haruji
Takata Syuichi
Shinko-Pfaudler Company Ltd.
Silverberg Sam
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