Method for forming an anticorrosive oxide layer on steels

Details Method for forming an anticorrosive oxide layer on steels Method for forming an anticorrosive oxide layer on steels

1977-11-17

1979-05-08

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 315, 252373, C23F 704

Patent

active

041534808

ABSTRACT:
A method is provided for forming an anti-corrosive oxide layer on steel. The steel surface is subjected to superheated steam for a period of one to several hours. Before subjecting the steel to the superheated steam, the steel surface is initially subjected to a gaseous formic acid atmosphere at a raised temperature of up to 480.degree. C. The treatment with superheated steam takes place during a further heating period in which a temperature between 450.degree. C. and 520.degree. C. is maintained under steam flow-through conditions in which the steam flow has a Reynolds number greater than 900.

REFERENCES:
patent: 1105251 (1914-07-01), Carnahan
patent: 1346473 (1920-07-01), Swan
patent: 2543710 (1951-02-01), Schmidt et al.
patent: 3954512 (1976-05-01), Kanter
Grobner et al., Chem. Zentralbl, (1960).

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