Electrochemical behavior of Ti-6.5Al-2Zr-1Mo-1V alloy under rotating condition with periodically fluctuating current density  

作　　者：Zhiyuan REN Dengyong WANG Juchen ZHANG Huayong LE Di ZHU 

机构地区：[1]College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China [2]Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology,Nanjing 210016,China [3]School of Mechanical Engineering,Hefei University of Technology,Hefei 230009,China

出　　处：《Chinese Journal of Aeronautics》2022年第5期484-496,共13页中国航空学报（英文版）

基　　金：funded by the National Natural Science Foundation of China(No.51805259);the National Natural Science Foundation of China for Creative Research Groups(No.51921003);the Natural Science Foundation of Jiangsu Province,China(Nos.BK20180431 and BK20190419);China Postdoctoral Science Foundation(Nos.2019M661833 and 2018M642246);Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology,China;the Young Elite Scientists Sponsorship Program by CAST,China。

摘　　要：Titanium alloy plays a crucial role in the electrochemical field due to its excellent corrosion resistance.The passivation and dissolution behaviors of Ti-6.5Al-2Zr-1Mo-1V(TA15)alloy in Na Cl solution were studied by simulating the electrochemical machining process in a rotating condition,which made the anode in a state with alternating high and low current density.Electron probe micro analysis,ultra-depth microscope,scanning electron microscope,and X-ray photoelectron spectrometer were used to reveal the evolution of TA15 under fluctuating current density.The existence state of the passivation film on TA15 surface was closely related to the pulse frequency of the periodically fluctuating current density.At higher pulse frequency of 0.20 Hz,the material was hardly dissolved because passivation dominated the electrolysis behavior,while at lower pulse frequency of 0.01 Hz,the passivation and dissolution behaviors occurred alternately with the variation of the current density.Herein,the thickness of the passivation film was inversely proportional to the applied current density.Due to the different electrochemical characteristics of a phase andβphase,the surface of the TA15 changed from being smooth to porous after a period.In addition,the change of microstructure affected the content of O^(2–)and exposed the suboxides of titanium.In a word,the change of pulse frequency and current density affected the electrochemical behavior of TA15,which was different from the conventional steady condition.

关 键 词：Dissolution Electrochemical behavior Passivation Rotating condition Ti-6.5Al-2Zr-1Mo-1V alloy 

分 类 号：V252[一般工业技术—材料科学与工程]