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为什么铁会生锈？

铁生锈是由于铁与氧气发生化学反应生成了铁氧化物。当铁暴露在潮湿的环境中，铁表面的水蒸气和氧气会与铁发生反应，形成铁氧化物（红锈）。这种反应称为氧化反应，需要水和氧气的存在。铁的生锈是由于铁氧化物相对于纯铁更加稳定，因此铁会逐渐形成铁氧化物的覆盖层。

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