| 摘要 |
PROBLEM TO BE SOLVED: To provide a multilayer coating film which has a high hardness and is not easily peeled. SOLUTION: The multilayer coating film 10 is formed from materials each having a hardness higher than that of an aluminum alloy 11. The multilayer coating film 10 has a bright nickel layer 13, a nickel phosphate layer 15 and a titanium nitride layer 17 laminated in this order on the aluminum alloy 11. The hardness is increased in the order of the aluminum alloy, the bright nickel layer, and the nickel phosphate layer, and the hardness of the titanium nitride layer is highest. The titanium nitride layer is hardly peeled even when scratch is caused, because the intermediate layers are laminated in the order of hardness although the difference between the hardnesses of the titanium nitride layer and the aluminum alloy is large. COPYRIGHT: (C)2007,JPO&INPIT
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