镀锌钢管防腐锌层对钢铁有屏蔽维护作用。锌在大气或其它环境下在钢铁基体表面构成屏蔽层。锌的腐蚀进程添加了其构成屏蔽层的才能,这是因为锌和空气中的氧、二氧化碳、潮气等反响,生成一种抗腐蚀副产物碱式碳酸锌膜。
介于基体与纯锌层之间的锌铁合金层含锌在90%,对钢有与锌近似的电化学维护作用;镀层越厚,经用年限也越长,经用年限与厚度根本成正比。


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