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白铁皮要比马口铁耐用:马口铁碰破一点，很快会烂掉;可是白铁皮即使碰破一大块，也不容易被锈蚀。这是因为锌的化学性质比铁活泼，当外界的空气和水份向白铁皮“进攻”时，锌首先与氧气化合，而保护了铁的安全。不过，白铁皮要比马口铁贵。