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为什么在铜表面镀镍

更新时间: 2020-09-22 00:00:00     

1、镍不活泼,可以保护铜不被氧化;

2、镀镍后可以阻止铜原子的迁移,若直接在铜基体上镀铬,铜原子会迁移的铬镀层,致使镀层泛铜色;

3、铜的硬度较小,易变形,在铜表面镀镍可以提高他的强度;

4、铜的延展性与渗透性很强,直接镀金后,放置一段时间后铜的颜色会渗透出来,导致变色。

关键词: 为什么 表面

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