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锌的优异抗蚀性是由于它暴露在自然环境过程中,在表面生成不溶的锌氧化物或碱式碳酸盐膜。这个保护膜需几天才能形成、并要求表面大部分是处于干燥的空间里。如新沉积的锌层连续地维持在潮湿的条件下,锌就很快发生腐蚀,减少锌层的保护寿命。这现象就如同通常的白锈或潮湿贮存时的变色。长期以来一直采用含铬酸盐溶液处理锌表面,以形成一层转化膜。阻止在潮湿环境中所遇到的腐蚀。铬酸盐钝化
The excellent corrosion resistance of zinc is due to its exposure to the natural environment, the formation of insoluble zinc oxide or carbonate film on the surface. This protective film takes days to form and requires most of the surface to be in a dry place. If the newly deposited zinc layer is continuously maintained under wet conditions, zinc quickly corrodes, reducing the protective life of the zinc layer. This phenomenon is like the usual white rust or moisture discoloration when stored. Chromate solutions have long been used to treat zinc surfaces to form a conversion coating. Prevent corrosion encountered in humid environments. Chromate passivation