| 简介 |
PROBLEM TO BE SOLVED : To provide a method for manufacturing a magnet with a highly adhesive protective film deposited thereon and excellent in resistance to corrosion and heat and to provide a surface-treating method for depositing the protective film excellent in adhesion on the surface of a material such as a rare-earth magnet where it is difficult to deposit a protective film. SOLUTION : The surface of a magnet containing rare-earth elements is electroplated by the use of a copper plating solution containing at least a copper salt compound, a phosphorus compound, an aliphatic phosphonic acid compound and a hydroxide to deposit a first protective film consisting of a copper coating film, and then a second protective film is deposited on the first protective film to manufacture the permanent magnet. |
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