| 简介 |
PROBLEM TO BE SOLVED : To provide a plating pretreatment method of a rare-earth magnet having, on the surface, a metallic plating film excellent in adhesion and an appearance, and also excellent in corrosion resistance.
SOLUTION : There is provided a plating pretreatment method of a rare-earth magnet, when forming a metallic film on the surface of the rare-earth magnet by electroless plating or electrolytic plating. In the plating pretreatment method of the rare-earth magnet, after performing an alkaline defatting treatment process, an acid activation treatment is performed in two stages of the first acid treatment process and the second acid treatment process, and smut removal by ultrasonic water washing is applied after each process.
SELECTED DRAWING : None
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