Method of manufacturing an immersion member with pore-sealing layer

Abstract

A manufacturing method for immersion members for molten metal baths, wherein a thermal sprayed coating including 1-50 wt % of tungsten boride, 3-25 wt % of one or more of Ni, Co, Cr, and Mo as a metal phase, and a remainder including tungsten carbide, is formed on the surface of a immersion member for use in molten metal baths, and subsequently, impregnation processing is conducted with respect to the thermal sprayed coating in a processing fluid having as a main component thereof chromic acid (H.sub.2 CrO.sub.4 and H.sub.2 Cr.sub.2 O.sub.7), and subsequently, baking processing is conducted. In accordance with this manufacturing method, a surface layer possessing fine microstructure and high bond strength not conventionally available is provided, and it is possible to manufacture a superior immersion member for use in molten metal baths which has superior resistance to corrosion, resistance to corrosive peeling, and resistance to abrasion, and to which metals do not easily adhere.

Dependencies are inferred from the claim text.