Treating composition, forming a mixed-carbide layer of Va-Group

Details Treating composition, forming a mixed-carbide layer of Va-Group Treating composition, forming a mixed-carbide layer of Va-Group

1978-08-08

1980-10-28

Ansher, Harold

Coating processes

Immersion or partial immersion

Chemical compound reducing agent utilized

106 122, 106 125, 148 611, 252184, 204 39, 427431, 428472, 428539, C23C 916, C25D 366, B32B 1518

Patent

active

042307511

ABSTRACT:
A method and treating material are presented for forming a mixed-carbide layer of at least one Va-Group element and of chromium on the surface of a carbon-containing ferrous-alloy material. A molten treating bath is prepared by introducing one or more Va-Group elements in oxide form and chromium in metal or alloy form or by introducing one or more Va-Group elements in metal or alloy form and at least one chromium oxide into a molten bath composed of boric acid, of at least one borate or of a mixture thereof. An article of carbon-containing ferrous alloy is immersed and maintained in the molten treating bath until a mixed-carbide layer is formed on its surface. The mixed-carbide layer formed on the surface of the article is very smooth, wear resistant and high-temperature-oxidation resistant.

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