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如何调整磷化液的pH值
更新时间: 2020-10-31 00:00:00  

可在磷化液里加入金属工件调整pH值。磷化液的主要成分是磷酸二氢盐,如Zn(H2PO4)2以及适量的游离磷酸和加速剂等。当金属工件一旦浸入加热的稀磷酸溶液中,就会生成一层膜。但由于这种膜的保护性差,所以通常的磷化在含有Zn、Mn等酸性溶液中进行。钢铁磷化主要用于耐蚀防护和油漆用底膜。

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