Microstructure and properties of surface nanocrystallization CP-Ti

被引：0
|
作者：
Zhang C. [1 ]
Song W. [1 ]
Xie G. [1 ]
He X. [1 ]
Wang Y. [1 ]
Li F. [1 ]
机构：
[1] School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an
来源：
| 1600年 / Editorial Office of Chinese Journal of Rare Metals卷 / 40期
关键词：
Electrochemical corrosion behavior; Microhardness; Microstructure; Surface mechanical attrition treatment (SMAT);
D O I：
10.13373/j.cnki.cjrm.XY15010902
中图分类号：
学科分类号：
摘要：
By means of surface mechanical attrition treatment (SMAT), a nanostructured surface layer was formed on the surface of commercial pure titanium (CP-Ti). The microstructure and the microhardness were measured by optical microscope (OM) and microhardness tester. The corrosion performance of CP-Ti samples before and after SMAT was investigated by potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS) measurements, combined with X-ray photoelectron spectroscopy (XPS) in Hank's artificial body fluid. The results showed that the grain size on the surface was on the nanometer scale and increased gradually from the surface to matrix after SMAT. The microhardness achieved about HV 236.7 in the top surface, which was significantly higher than that of the matrix. Compared with untreated sample, the self corrosion potential of the SMAT samples was more positive, the corrosion current densities decreased. The size of the capacitive loop after SMAT was larger than that of the untreated sample. That indicated a compact and stable passive film formed on the surface. High density of the nano grain boundary and dislocation generated from the process of surface nanocrystallization provided more channels for Ti4+ to form the passive oxide films. The main component of the passive oxide films was TiO2. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.
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页码：982 / 989
页数：7
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