Tribocorrosion Behavior and Degradation Mechanism of 316L Stainless Steel in Alkaline Solution:Effect of Tribo-Film  

作　　者：Jingyi Zou Zhongwei Wang Yanlong Ma Liwen Tan 

机构地区：[1]College of Material Science and Engineering,Chongqing University of Technology,Chongqing 400054,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2022年第8期1365-1375,共11页金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China under grant No.51801016;the Natural Science Foundation of Chongqing under grant No.cstc2019jcyj-msxmX0134;the Science and Technology Research Program of Chongqing Municipal Education Commission under grant No.KJQN201901132;the University Innovation Research Group of Chongqing under grant No.CXQT20023;the Scientific Research Foundation of Chongqing University of Technology under grant No.2019ZD02。

摘　　要：Tribocorrosion behavior and degradation mechanism of 316L stainless steel(SS)in alkaline solution were studied.The SS was worn in 0.1 mol/L NaOH solution with different potentials to investigate the synergism between wear and corrosion.The SS showed larger material loss at a cathodic potential of-0.8 V and lower material loss at anodic potential when compared with that under pure wear condition.This was inverse when compared with that in other corrosive media,such as H_(2)SO_(4)and NaCl solutions.The formation of Tribo-films with different properties at different potentials played decisive role in the degradation process.Tribo-films were formed at cathodic potential(-0.8 V)and anodic potentials(0 and 0.4 V).The tribo-film formed at-0.8 V had the highest O content and was very brittle.It resulted in the easily peeling off of the film and then the acceleration of material degradation.By contrast,the Tribo-films formed at anodic potentials were more complete and the O content was much lower.Such kind of ductile Tribo-films could protect the SS from wear.The locally high concentration of OH-produced in the reduction reaction of oxygen at-0.8 V could react with the tribo-film which consist of nano-particles(NPs)with high chemical activity and finally led to deep oxidation and embrittlement of the film.The passivation of the NPs at the anodic potentials could inhibit the oxidation of tribo-film to maintain its ductility.

关 键 词：TRIBOCORROSION 316L stainless steel NAOH Tribo-film NANO-PARTICLES 

分 类 号：TG178[金属学及工艺—金属表面处理]