Anodic dissolution mechanism of TA15 titanium alloy during counter-rotating electrochemical machining

作     者：CAO WenJian WANG DengYong CUI GuoWei ZHU Di CAO WenJian;WANG DengYong;CUI GuoWei;ZHU Di

作者机构：College of Mechanical and Electrical EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China Jiangsu Key Laboratory of Precision and Micro-Manufacturing TechnologyNanjing 210016China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2022年第65卷第6期

页      面：1253-1262页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：supported by the National Natural Science Foundation of China(Grant No.51805259) the National Natural Science Foundation of China for Creative Research Groups(Grant No.51921003) the China Postdoctoral Science Foundation(Grant No.2019M661833) the Postgraduate Research&Practice Innovation Program of Jiangsu Province(Grant No.KYCX21_0192) 

主　　题：counter-rotating electrochemical machining(CRECM) anode dissolution behaviour current signal quantitative model TA15 titanium alloy 

摘      要：Counter-rotating electrochemical machining(CRECM)is a novel shaping method with advantages in processing revolving parts,especially engine ***,few researchers have studied the anodic behaviour of the counter-rotating *** paper aims to analyse the anode dissolution behaviour of TA15 and obtain desired surface qualities in *** anodic characteristics were measured by polarization and cyclic voltammetry curves,and the passive-trans passive behaviour of TA15 was *** electrode surface structures at different stages were analysed using electrochemical impedance spectroscopy(EIS),and a quantitative dissolution model was established to illustrate the electrochemical dissolution and structural evolution of the revolving surfaces.A series of CRECM experiments were conducted,and three stages(pitting corrosion,pitting expansion,and smoothing)were detected according to the current *** the first stage,an oxide film with small pores was formed initially on the metal surface when exposed to *** air-formed oxide film was broken down locally during the electrochemical reaction process,resulting in the occurrence of *** the increase of electricity,the oxide layer became thinner,and the pitting areas expanded and began to connect with each *** this stage,the surface quality was poor owing to the uneven material *** the amount of electricity approximately reached a constant,the oxide layer was completely removed,and a very thin salt film was generated at the metal-electrolyte *** this stage,the material was dissolved uniformly,and the surface was smooth without pitting *** on the obtained results,anode workpieces with grid-like convex structures were fabricated using *** the revolving surface and the sidewalls of the convex structures can be controlled from pitting to smoothness.