Anodically dissolving group v-a element into molten borate bath

Details Anodically dissolving group v-a element into molten borate bath Anodically dissolving group v-a element into molten borate bath

C - Chemistry, Metallurgy

25

D

204/80.5

C25D 9/04 (2006.01) C23C 10/24 (2006.01) C23C 30/00 (2006.01) C25D 11/00 (2006.01)

Patent

CA 1036976

ABSTRACT OF THE DISCLOSURE: A method for forming a carbide layer of an element of group V-a of the Periodic Table on the surface of an iron, ferrous alloy or cemented carbide article in a treating molten bath, comprising heating a boric acid or borate up to its molten state to form a molten bath, dipping a metal block containing a V-a group element into the molten bath, applying an electric current to the molten bath through the metal block being used as anode for anodically dissolving at least part of metal block to supply at least 1% of the V-a group element into the molten bath for preparing the treating molten bath, and immersing the article containing at least 0.05% of carbon in the treating molten bath, thereby forming a very hard carbide layer of the V-a group element on the surface of the article. The method of this inven- tion can form a very smooth carbide layer on the surface of the article.

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