Method for surface treatment and treating material therefor

Details Method for surface treatment and treating material therefor Method for surface treatment and treating material therefor

1987-06-30

1988-10-18

Brody, Christopher W.

Metal treatment

Compositions

Heat treating

148 20, 148 28, 427431, C21D 148

Patent

active

047785403

ABSTRACT:
A method and a bath agent for forming a carbide or diffusion layer on the surface of an article to be treated by immersing the article in a molten salt bath. The salt bath comprises borax, at least one oxide of a surface layer forming element (SFE) selected from the group consisting of an oxide of a Va-Group element of the Periodic Table and an oxide of chromium, and aluminum. The amounts of the SFE-oxide and of aluminum to the whole amount of the bath are 9.5 to 21.5 wt% and 4 to 7.5 wt%, respectively. The treating method provides the extended life of the bath, the facilitation of washing off the bath agent adhered to the treated article, etc.

REFERENCES:
patent: 3930060 (1975-12-01), Komatsu et al.
patent: 4158578 (1979-06-01), Komatsu et al.
patent: 4230751 (1980-10-01), Komatsu et al.
patent: 4400224 (1983-08-01), Arai et al.
patent: 4453987 (1984-06-01), Arai et al.

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