New surface blackening process with heteropoly acid - CuSO 4 is stated and its possible mechanism discussed.

报道了杂多酸 - 硫酸铜在钢铁表面发黑新工艺,探讨了可能的发黑机理.

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CuSO 4 crystal containing water number usually determine with heating - losing heavy, microwave drying etc.

硫酸铜晶体所含结晶水的测定,常用加热失重 、 微波加热等方法.

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