Influence of Equal Channel Angular Pressing on Surface Performance of Ti-0.2Pd in Simulated Body Fluid
Ti-0.2Pd, a titanium alloy with higher crevice corrosion resistance is highlighted for implant applications.In this work, the surface performance of Ti-0.2Pd process by equal channel angular pressing is investigated by means of electrochemical impedance spectroscopy and soaking tests in simulated body fluid.The surface electrochemical behavior investigated by simulated equivalent electric circuits shows a larger charge transfer resistance of the surface of ECAPed specimens indicating a thicker layer formation on them, while a larger Warburg resistance of WQ specimen indicating a denser layer formation on it.The composition of the surface after soaking 60 days in a simulated body fluid containing 0.8g/L bovine serum albumin is detected by an EDS and an X-ray photoelectronic spectroscopy.The result shows larger attachment of the compound containing Ca, P, O and Ti on ECAPed pieces.Comparing with those of heat treated specimens, the attachment containing more Ca, P and O element on ECAPed specimens.The Ca∶P ratio is ranged from 1∶0.7 to 1∶ 4.4.From these results it is concluded that ECAP process promotes Ca, P and O element attachment on the surface of Ti-0.2Pd.Ti-0.2Pd processed by ECAP can be used as a kind of more biocompatible material.
corrosion EIS surface attachment ECAP Ti-0.2Pd
Cheng-Hong Zou Qing Zhou Lei Wang Wang-Tao Chang
College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
国内会议
广州
英文
122-128
2017-03-29（万方平台首次上网日期，不代表论文的发表时间）