304不锈钢管生锈的缘由是不锈钢外表具有富铬氧化膜(维护膜)以避免氧原子浸透和氧化，从而取得抗腐蚀才能。一旦出于某种缘由，这种薄膜不时被毁坏，空气或液体中的氧原子将继续浸透或金属中的铁原子将继续别离出来。

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