| 简介 |
PROBLEM TO BE SOLVED : To provide a plating liquid capable of forming a protective film excellent in adhesiveness, corrosion resistance and heat resistance on the surface of a conductive raw material such as rare earth magnet without corroding the conductive raw material such as rare earth magnet. SOLUTION : The plating liquid comprises a nickel salt compound and an amine compound which forms a complex with a nickel ion, and has pH 8 to 12. Molar ratio of the nickel ion to the amine compound is 1.0 to 3.0 times of coordination number of the amine compound to the nickel ion and stepwise formation constant K1of a primary step reaction when the amine compound forms the complex with the nickel ion preferably falls into the range of K1= 4.0 to 15.0. COPYRIGHT : (C)2008, JPO&INPIT |
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