TY - JOUR
T1 - Effect of electropolishing on electrochemical behaviours of titanium alloy Ti-10V-2Fe-3Al
AU - Yu, Mei
AU - Yi, Junlan
AU - Liu, Jianhua
AU - Li, Songmei
AU - Wu, Guolong
AU - Wu, Liang
PY - 2011/6
Y1 - 2011/6
N2 - 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 fl at, 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 fi lm formed on titanium alloy Ti-10V-2Fe-3Al. Furthermore, the mechanism of electropolishing improving the corrosion resistance of the anodic oxide fi lm was proposed.
AB - 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 fl at, 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 fi lm formed on titanium alloy Ti-10V-2Fe-3Al. Furthermore, the mechanism of electropolishing improving the corrosion resistance of the anodic oxide fi lm was proposed.
KW - Atomic force microscopy
KW - Electrochemical impedance spectroscopy
KW - Electropolishing
KW - Titanium alloy
KW - X-ray photoelectron spectroscopy
UR - https://www.scopus.com/pages/publications/81255129593
U2 - 10.1007/s11595-011-0251-z
DO - 10.1007/s11595-011-0251-z
M3 - 文章
AN - SCOPUS:81255129593
SN - 1000-2413
VL - 26
SP - 469
EP - 477
JO - Journal Wuhan University of Technology, Materials Science Edition
JF - Journal Wuhan University of Technology, Materials Science Edition
IS - 3
ER -