Reoxidation process and corrosion behavior of TA15 alloy by laser ablation  

作　　者：Bo-Wen Liu Gao-Yang Mi Chun-Ming Wang 

机构地区：[1]School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Rare Metals》2021年第4期865-876,共12页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51861165202 and 51705173);the Science and Technology Planning Project of Guangdong Province(No.2017B090913001)。

摘　　要：The thermal oxide layer formed of TA15 alloy has poor corrosion resistance.In this paper,the changes of the elements and components on the surface after laser ablation with different energy densities(E) were researched.The formation process and corrosion behavior of laser-generated oxide layer were clarified.As E increases,the oxygen content decreases from 8.52% to 5.43% and then increases to 11.89%.The surface oxide layer changes from TiO_(2)(R)(i.e.,rutile) to Ti_(2) O_(3)+TiO_(2)(R) and finally becomes TiO_(2)(R)+TiO_(2)(A)(i.e.,anatase).The TiO_(2)(R) gasification was confirmed by calculating the surface temperature rise.The surface reoxidation process was illustrated by a thermodynamically calculated ΔGT(i.e.,the Gibbs free energy changes with temperature).When E≥17.5 J·cm^(-2),the oxide layer exhibits an agitated morphology,and oxide falls off at the bottom.As E increases,the corrosion rate decreases first and then increases.With energy density of 8.75 J·cm^(-2),the surface corrosion rate was 20.43 times slower than that of the untreated sample.The impedance spectrum and equivalent resistance results also prove the best corrosion resistance at 8.75 J·cm^(-2).The corrosion behavior of the oxide layer is analyzed from the properties of the oxide layer components and the reaction products with the electrolyte.

关 键 词：Laser ablation TA15 alloy Reoxidation process Corrosion behavior Elemental analysis 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TG146.23[一般工业技术—材料科学与工程]