过去电刷镀都用镍镀层代替铬镀层，但镍镀层的耐磨性、硬度等性能不如铬镀层。
In conventional brush plating, Ni plate is used to replace Cr one, but the former is not as good as the latter in wear resistance, hardness and so on.
过去电刷镀都用镍镀层代替铬镀层，但镍镀层的耐磨性、硬度等性能不如铬镀层。
In conventional brush plating, Ni plate is used to replace Cr one, but the former is not as good as the latter in wear resistance, hardness and so on.
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