| 硝酸钙对镁合金锰系磷化膜耐蚀性的影响 |
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| 引用本文： | 宋政伟,丁莉峰.硝酸钙对镁合金锰系磷化膜耐蚀性的影响[J].电镀与涂饰,2021,40(1):75-79. |
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| 作者姓名： | 宋政伟 丁莉峰 |
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| 作者单位： | 太原工业学院化学与化工系,山西 太原 030000;太原工业学院化学与化工系,山西 太原 030000 |
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| 基金项目： | 太原工业学院青年学术带头人(2018);山西省教育厅科技创新项目 |
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| 摘 要： | 在由Mn(H2PO4)2、C6H8O7、NaOH和H3PO4组成的磷化液中加入Ca(NO3)2,考察了体系pH、磷化时间和硝酸钙用量对镁合金AZ31B锰系磷化膜耐蚀性的影响,利用扫描电子显微镜、能谱仪和X射线衍射仪表征了磷化膜的微观结构、元素成分和相结构,用硫酸铜点滴腐蚀试验、动电位极化曲线测量和电化学阻抗谱技术测试了它的耐蚀性。结果表明,添加0.2 g/L硝酸钙所得磷化膜致密、少孔,耐蚀性最好。
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| 关 键 词： | 镁合金 锰系磷化膜 硝酸钙 耐蚀性 电化学 |
Effect of calcium nitrate on corrosion resistance of Mn-based phosphating film on Mg alloy |
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| SONG Zhengwei,DING Lifeng.Effect of calcium nitrate on corrosion resistance of Mn-based phosphating film on Mg alloy[J].Electroplating & Finishing,2021,40(1):75-79. |
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| Authors: | SONG Zhengwei DING Lifeng |
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| Affiliation: | (Department of Chemistry and Chemical Engineering,Taiyuan Institution of Technology,Taiyuan 030000,China) |
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| Abstract: | Ca(NO3)2 was added to a phosphating bath composed of Mn(H2PO4)2,C6H8O7,NaOH,and H3PO4.The effects of bath pH,phosphating time,and Ca(NO3)2 dosage on corrosion resistance of Mn-based phosphating film on AZ31B magnesium alloy were studied.The microstructure,elemental composition,and phase constitution of the phosphating film were characterized by scanning electron microscopy,energy-dispersive spectroscopy,and X-ray diffractometry,and its corrosion resistance was tested by CuSO4 dropping corrosion test,potentiodynamic polarization measurement,and electrochemical impedance spectroscopy.The results showed that the phosphating film prepared with 0.2 g/L Ca(NO3)2 was compact and pore-free,and had the best corrosion resistance. |
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| Keywords: | magnesium alloy manganese-based phosphating film calcium nitrate corrosion resistance electrochemistry |
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