PROCESS FOR PRODUCING IMMERSION MEMBER OF MOLTEN METAL BATH

摘要

A process for producing an immersion member of a molten metal bath, which comprises forming on the surface of the base for said immersion member a flame spray coating comprising 1 to 50 wt % of tungsten boride, 3 to 25 wt % of at least one metal selected among nickel, cobalt, chromium and molybdenum and the balance of tungsten carbide and inevitable impurities, impregnating the formed coating with a liquid treatment mainly comprising chromic acid (H2CrO4 and H2Cr2O7), and burning the resulting coating. This process provides an excellent immersion member which has a dense and firm surface coating layer which has not been available heretofore, is excellent in the resistances to erosion, erosive peeling and abrasion, and scarcely undergoes adhesion of metal.