Study on preparation and anodic oxidation of gradient porous NiTi alloy
Gradient porous NiTi alloys were prepared by powder metallurgy method using NH4HCO3 as space-holder and modified by direct current-pulse anodic oxidation technology in low temperature.Pore characteristic and phase composition of gradient porous NiTi alloys were studied.Microstructure,composition,anti-corrosion and Ni ion release behavior of surface film were observed.The results show the porosity of porous NiTi alloys decreases from 53.2% to 42.8%,when the content of NH4HCO3 varying from uniformity to gradient distribution.The sintered gradient porous NiTi alloys composes with TiNi,Ti2Ni and TiNi3 phases.After anodic oxidation,Ti oxidation film with the thick of 240nm was formed on the gradient porous NiTi alloy.The corrosion resistance of gradient porous NiTi alloy was obviously improved and the rate of Ni release was significantly reduced.
Gradient porous NiTi alloy anodic oxidation preparation corrosion resistance
Qiang LI Jing-yuan YU Xu-dong SUN
The Key Laboratory of New Materials in Automobile of Liaoning Province, Liaoning University of Techn School of Material & Metallurgy, Northeastern University, Shenyang 110004, China
国际会议
厦门
英文
1373-1377
2012-01-04（万方平台首次上网日期，不代表论文的发表时间）