Process for producing a protective coating on iron-based tools intended to be placed in contact with a molten ferrous metal or alloy, coating thus obtained and tool comprising such a coating

摘要

To produce a protective surface coating on tools (1, 5) made of iron-based material and intended to be brought into contact with a molten nonferrous metal or alloy, a thin layer (3, 6, 7) of an alloy of iron and of a nonferrous second metal is formed on the surface of the said tools (1, 5), this alloy being chosen so that the molten nonferrous metal or alloy has a lower tendency than iron to take up the said iron alloy and the nonferrous second metal. Application for tools for casting nonferrous metals and alloys. <IMAGE>