选择酒石酸钠环保电解液,用恒电势法在不同浓度条件(1,5,15,30和50 g/L)下制备TA2纯钛阳极氧化膜.采用原子力显微镜分析膜层的微观三维形貌,使用电化学工作站研究试样在3.5％ NaCl溶液低电位下的极化曲线和电化学交流阻抗谱,探讨微观三维形貌对耐腐蚀性能的影响.结果表明:15 g/L浓度时,氧化膜层细小均匀,生长完整,粗糙度较低,具有宽广的钝化区,最大的极化电阻值,较小的致钝电流值和自腐蚀电流值,耐腐蚀性能最佳.
Anodic oxide films on TA2 commercially pure titanium surface were prepared with sodium tartrate environmental solution by a potentiostatic method at the concentrations of 1,5,15,30 and 50 g/L.The microstructure of the films was analyzed by atomic force microscope,the Tafel polarization curves and electrochemical impedance spectra of the samples at low potential of 3.5％ NaCl were analyzed by electrochemical workstation,and the influence of microstructure on corrosion resistance was discussed.The results show that when the concentration is about 15 g/L,the oxide film has a good micro morphology,a broad passivation area,a maximum polarization resistance value,smaller passivation current and self corrosion current,when it has the best corrosion resistance.
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