问题标题：
英语翻译Thecoatingofzincservestwopurposes:firstlyitcoverstheironandpreventsitsoxidation(ratherlikeacoatofpaint)andsecondlyitprovidesanodicprotection.Ifthegalvanizedsteelisscratched,allowingtheairtooxidizesomeiro
问题描述：
英语翻译
Thecoatingofzincservestwopurposes:firstlyitcoverstheironandpreventsitsoxidation(ratherlikeacoatofpaint)andsecondlyitprovidesanodicprotection.Ifthegalvanizedsteelisscratched,allowingtheairtooxidizesomeiron,theFe2+producedisimmediatelyreducedtoironbythezinc,andrustingdoesnotoccur.Similarapplicationsinwhichonemetalissacrificedtoprotectanotheraretheattachingofsacrificialblocksofmagnesiumtoundergroundsteelpipelinesandthehullsofshipstopreventtherustingofiron.
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程雄回答：
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.
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