Electropolishing of titanium alloy under hydrodynamic mode  

作　　者：Pei Huang Junhui Lai Lianhuan Han Fang-Zu Yang Li-Min Jiang Jian-Jia Su Zhao-Wu Tian Zhong-Qun Tian Dongping Zhan 

机构地区：[1]State Key Laboratory of Physical Chemistry of Solid Surfaces,Department of Chemistry College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,China [2]School of Material Science and Engineering,Nanchang Hangkong University,Nanchang 330034,China

出　　处：《Science China Chemistry》2016年第11期1525-1528,共4页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China (91323303, 21327002, 21573054, 21321062)

摘　　要：Titanium(Ti) alloys are widely used in aerospace industry due to the low density and high corrosion resistance. However, machining and polishing remain great challenges because of the hardness and chemical stability. With a home-made electrochemical machining workstation, cyclic voltammetry is performed at a wide potential range of [0 V, 20 V] to record the details of passivation and depassivation processes under a hydrodynamic mode. The results show that the thickness of viscous layer formed on the alloy surface plays a crucial effect on the electropolishing quality. The technical parameters, including the mechanical motion rate, polishing time and electrode gap, are optimized to achieve a surface roughness less than 1.9 nm, which shows a prospective application in the electrochemical machining of Ti and it alloys.Titanium（Ti） alloys are widely used in aerospace industry due to the low density and high corrosion resistance. However, machining and polishing remain great challenges because of the hardness and chemical stability. With a home-made electrochemical machining workstation, cyclic voltammetry is performed at a wide potential range of [0 V, 20 V] to record the details of passivation and depassivation processes under a hydrodynamic mode. The results show that the thickness of viscous layer formed on the alloy surface plays a crucial effect on the electropolishing quality. The technical parameters, including the mechanical motion rate, polishing time and electrode gap, are optimized to achieve a surface roughness less than 1.9 nm, which shows a prospective application in the electrochemical machining of Ti and it alloys.

关 键 词：electrochemical machining electropolishing titanium alloy hydrodynamic viscous layer 

分 类 号：TG175.3[金属学及工艺—金属表面处理]