A process for the preparation of a carbide layer of an element of the group va of the periodic table, to the surface of an iron -, iron alloy - or sintered carbide against state

摘要

A method for forming a carbide layer of a V-a group element 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 containing a V-a group element into the molten bath, applying an electric current to the molten bath through said metal, which works as its anode, for anodically dissolving said metal into the molten bath to prepare the treating molten bath, and immersing the article in the treating molten bath, thereby forming a very hard carbide layer of said V-a group element on the surface of said article. The method of this invention can form a very smooth carbide layer on the surface of the article.