锌涂层有两个目的：第一,覆盖在铁表面防止氧化（和油漆涂层不同）；第二,提供阴极保护.如果镀锌钢材表面被刮伤,空气则会氧化铁,锌就会立即减少产生的二价铁,进而不会发生锈蚀.牺牲一些金属以保护另一些金属的类似应用有：在地下钢管和船体上附加牺牲镁块来防止铁生锈.
英语翻译The coating of zinc serves two purposes:firstly it cover
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翻译 purpose of the event
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serve one's purpose