Effects of thiosulfate and dissolved oxygen on crevice corrosion of Alloy 690 in high-temperature chloride solution  

作　　者：Fangqiang Ning Jibo Tan Ziyu Zhang Xinqiang Wu Xiang Wang En-Hou Han Wei ke 

机构地区：[1]CAS Key Laboratory of Nuclear Materials and Safety Assessment,Liaoning Key Laboratory for Safety and Assessment Technique of Nuclear Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang J10016,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China

出　　处：《Journal of Materials Science & Technology》2021年第7期163-176,共14页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 51671201, 51971230);the National Science and Technology Major Project (No. 2017ZX06002003004-002);the Key Programs of the Chinese Academy of Sciences (Research on the Development of Nuclear Power Materials and Service Security Technology), (No. ZDRW-CN-2017-1)。

摘　　要：The crevice corrosion behavior of Alloy 690 was investigated in high-temperature chloride solution containing different concentrations of thiosulfate(S_(2)O_(3)^(2-)) and dissolved oxygen(DO). The S2O32- inhibited corrosion of Alloy 690 through consuming oxygen in aerated chloride solution. In deaerated chloride solution,the S_(2)O_(3)^(2-) was reduced to S° and S^(2-) and subsequently incorporated into the oxide films, which promoted the pitting corrosion at locations of both TiN inclusions and matrix inside the crevice during the crevice corrosion as well as influenced the composition and thickness of the oxide films. The effect mechanisms of S_(2)O_(3)^(2-) and DO on crevice corrosion in high-temperature chloride solution are discussed.

关 键 词：ALLOY Crevice corrosion Pitting corrosion High-temperature corrosion THIOSULFATE OXIDATION 

分 类 号：TL353.13[核科学技术—核技术及应用] TG174.3[金属学及工艺—金属表面处理]