滚镀：主要适用于尺寸较小、批量较大的零件。
Roll plating: mainly used in the small in size, batch larger parts.
滚镀：主要适用于尺寸较小、批量较大的零件。
Hang plating: mainly used in the overall size of the larger parts.
分析了小五金产品滚镀黄铜层易产生棕黑斑点的原因，论述了黄铜层出现棕黑斑点是零件基材腐蚀的开始。
Causes of brown or black spots in brass barrel plating of small hardware were analyzed and some counter measures were put forward.
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