PURPOSE: To eliminate the need for Ni-P plating and to reduce cost by forming a coating layer of a metal which forms an alloy harder than aluminum by reacting with the aluminum on the surface of an aluminum or aluminum alloy surface, then subjecting the coating layer to a heating diffusion treatment, thereby forming the alloy layer.
CONSTITUTION: The coating layer of the metal which forms the alloy harder than the aluminum by reacting with the aluminum is formed on the surface of the aluminum or aluminum alloy layer and is then subjected to the heating diffusion treatment, by which the alloy layer of the metal and aluminum forming the coating layer is formed on the surface of the aluminum or aluminum alloy substrate. Cu, Ni, Au, Fe, etc., are usable as the metal to form the alloy harder than the aluminum and the thickness of the metallic coating layer is preferably specified to 5W20μm. The temp. of the heating diffusion treatment is preferably 500±20°C if the metal to constitute the metallic coating layer is Cu.
SAKAGUCHI MASASHI
NISHIZAWA KAZUYOSHI
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