AZ31镁合金表面聚吡咯-钼酸盐膜的腐蚀性能（英文）

发布时间：2019-02-25 17:56

【摘要】：在水杨酸钠溶液中采用循环伏安法在AZ31镁合金表面分别电聚合聚吡咯(PPy)膜和聚吡咯-钼酸根膜(PPy-MoO_4~(2-))。利用扫描电子显微镜(SEM)观测PPy膜和PPy-MoO_4~(2-)膜层腐蚀前后的表面形貌,衰减全反射红外光谱(ATR-IR)反映了PPy膜和PPy-MoO_4~(2-)膜的特征吸收峰,研究了MoO_4~(2-)的存在对PPy特征吸收峰的影响。使用四探针法测量薄膜的表面电阻;采用开路电位(OCP),电化学交流阻抗谱(EIS)和动电位极化曲线测试PPy膜和PPy-MoO_4~(2-)膜在3.5%Na Cl溶液中浸泡12 h后的耐腐蚀性能。结果显示,PPy-MoO_4~(2-)膜层更紧凑,PPy-MoO_4~(2-)膜层的腐蚀电流密度比PPy膜的低3个数量级。钼酸根的存在使得PPy-MoO_4~(2-)膜的表面电阻比PPy膜小,且PPy-MoO_4~(2-)膜的耐腐蚀性能较好。
[Abstract]:Electropolymerization of polypyrrole (PPy) film and polypyrrole-molybdate membrane (PPy-MoO_4~ _ (2 -).) on AZ31 magnesium alloy by cyclic voltammetry in sodium salicylate solution Scanning electron microscopy (SEM) was used to observe the surface morphology of PPy and PPy-MoO_4~ (2 -) films before and after corrosion. The attenuated total reflection infrared spectroscopy (ATR-IR) reflected the characteristic absorption peaks of Py and PPy-MoO_4~ (2 -) films. The effect of the presence of MoO_4~ (2 -) on the characteristic absorption peak of PPy was studied. The surface resistance of the film is measured by four probe method. The corrosion resistance of Py and PPy-MoO_4~ (2 -) films after immersion in 3.5%Na Cl solution for 12 h was measured by open-circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curves. The results show that the PPy-MoO_4~ (2 -) layer is more compact and the corrosion current density of the PPy-MoO_4~ (2 -) film is three orders of magnitude lower than that of the PPy film. Because of the presence of molybdate, the surface resistance of PPy-MoO_4~ _ (2 -) film is smaller than that of PPy film, and the corrosion resistance of PPy-MoO_4~ _ (2 -) film is better than that of PPy-MoO_4~ _ (2 -) film.
【作者单位】：哈尔滨工程大学超轻材料与表面技术教育部重点实验室;
【基金】：National Natural Science Foundation of China(51305090,51479037) Natural Science Foundation of Heilongjiang(B201317)
【分类号】：TG174.4

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