Effect of Electropolishing on Electrochemical Behaviours of Titanium Alloy Ti-10V-2Fe-3Al  

作　　者：于美 刘建华 

机构地区：[1]School of Materials Science and Engineering,Beihang University

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2011年第3期469-477,共9页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(No.51001007)

摘　　要：The electrochemical behaviours of titanium alloy Ti-10V-2Fe-3Al after electropolishing in a self-developed electrolyte in comparison with conventional grinding were studied by electrochemical impedance spectroscopy （EIS）.Optical microscopy （OM）,scanning electron microscopy （SEM）,atomic force microscopy （AFM） and X-ray photoelectron spectroscopy （XPS） were used to evaluate the surface characteristics of the alloy.It was found from the EIS experiments that the polarization resistance （Rp） was increased,the double layer capacitance （Qc） was decreased and the electrochemical impedance of the alloy was enhanced by electropolishing.The electropolished surface was flat,smooth and bright and its roughness was 3.310 nm.To underline the advantage of electropolishing process against grinding to provide the anodic oxidation process with a higher quality substrate,the ground and electropolished titanium alloys were anodized in parallel under the same conditions.The corrosion behaviours of the two kinds of anodized titanium alloys were compared.It was revealed that electropolishing generated a high quality substrate and improved the corrosion resistance of anodic oxide film formed on titanium alloy Ti-10V-2Fe-3Al.Furthermore,the mechanism of electropolishing improving the corrosion resistance of the anodic oxide film was proposed.The electrochemical behaviours of titanium alloy Ti-10V-2Fe-3Al after electropolishing in a self-developed electrolyte in comparison with conventional grinding were studied by electrochemical impedance spectroscopy （EIS）.Optical microscopy （OM）,scanning electron microscopy （SEM）,atomic force microscopy （AFM） and X-ray photoelectron spectroscopy （XPS） were used to evaluate the surface characteristics of the alloy.It was found from the EIS experiments that the polarization resistance （Rp） was increased,the double layer capacitance （Qc） was decreased and the electrochemical impedance of the alloy was enhanced by electropolishing.The electropolished surface was flat,smooth and bright and its roughness was 3.310 nm.To underline the advantage of electropolishing process against grinding to provide the anodic oxidation process with a higher quality substrate,the ground and electropolished titanium alloys were anodized in parallel under the same conditions.The corrosion behaviours of the two kinds of anodized titanium alloys were compared.It was revealed that electropolishing generated a high quality substrate and improved the corrosion resistance of anodic oxide film formed on titanium alloy Ti-10V-2Fe-3Al.Furthermore,the mechanism of electropolishing improving the corrosion resistance of the anodic oxide film was proposed.

关 键 词：titanium alloy electropolishing electrochemical impedance spectroscopy X-ray photoelectron spectroscopy atomic force microscopy 

分 类 号：TG146.23[一般工业技术—材料科学与工程]