Anyone who is a industrial waste gas, waste gas fuel have pollution atmosphere, zinc coating the corrosion resistance than at sea or plating, cadmium in the ocean in the opposite.
凡属有工业废气、燃料废气污染的大气中，锌镀层的耐蚀性优于镉镀层，在海上或海水中则相反。
Red copper, atmosphere and sea water corrosion and excellent electric conductivity. Welding of red copper such as electrical copper row.
紫铜，耐大气，海水腐蚀，导电性好。紫铜焊接用，如导电铜排。
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