合金钢黑色磷化膜研制及耐蚀性研究

Alloy Steel Black Phosphating Film Preparation and Corrosion Resistance Research

通过单因素实验和正交试验确定了一种合金钢的黑色磷化液的组成和操作条件,并用中性盐雾试验和电化学测试表征了黑色磷化膜的耐腐蚀性。结果表明,最优黑色磷化液的成分为:30 g/L马日夫盐,20 g/L Zn(H2PO4)2·2H2O,8 g/L Zn(NO3)2·6H2O,10 g/L Mn(NO3)2。在最优磷化液中得到的黑色磷化膜耐中性盐雾试验6h未见腐蚀。通过X-射线衍射分析,黑色磷化膜由Mn2Zn(PO4)2·4H2O、Zn2Fe(PO4)2·4H2O和Zn3(PO4)2·4H2O组成。

A black phosphating solution for alloy steel was developed by single factor experiment and orthogonal experiment.Corrosion resistance of the black phosphating film was characterized by neutral salt spray test and electrochemical test.Results showed that the optimal composition of the black phosphating solution was：30g/L manganese dihydrogen phosphate,20 g/L Zn （H2PO4） 2· 2H2O,8 g/L Zn （NO3） 2·6H2O,10g/L Mn（NO3）2;and no corrosion occurred in the film after 6h neutral salt spray test.Major components of the film were Mn2Zn（PO4）2 ·4H2O,Zn2Fe（PO4）2 ·4H2O and Zn3 （PO4）2 ·4H2O by X-ray diffraction （XRD） analysis.