Mechanism of the dual effect of Te addition on the localised corrosion resistance of 15-5PH stainless steel

被引：37
作者：
Yang, Shufeng [1 ,2 ]
Che, Zhichao [1 ,2 ]
Liu, Chao [3 ,4 ]
Liu, Wei [1 ,2 ]
Li, Jingshe [1 ]
Cheng, Xuequn [3 ,4 ]
Li, Xiaogang [3 ,4 ]
机构：
[1] Univ Sci & Technol Beijing, Sch Met & Ecol Engn, Beijing, Peoples R China
[2] Univ Sci & Technol Beijing, State Key Lab Adv Met, Beijing, Peoples R China
[3] Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Key Lab Corros & Protect, Minist Educ, Beijing, Peoples R China
[4] Univ Sci & Technol Beijing, Natl Mat Corros & Protect Data Ctr, Beijing, Peoples R China
来源：
CORROSION SCIENCE | 2023年 / 212卷
基金：
中国国家自然科学基金;
关键词：
Stainless steel; AFM; Inclusion; Pitting corrosion; RARE-EARTH-ELEMENTS; PITTING CORROSION; MNS INCLUSIONS; NONMETALLIC INCLUSIONS; SULFIDE INCLUSIONS; ELECTROCHEMICAL-BEHAVIOR; WEATHERING STEEL; PIT INITIATION; PASSIVE FILM; MICROSTRUCTURE;
D O I：
10.1016/j.corsci.2023.110970
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of tellurium (Te) on the localised corrosion mechanism in 15-5PH stainless steel is studied in a simulated marine environment. The addition of Te changed the composition and size of the inclusions, which significantly affected the localised corrosion mechanism of the steel. Scanning Kelvin probe force microscopy and current-sensing atomic-force microscopy results show that the inclusions have good electrical conductivity and are always electrochemically dissolved. During the corrosion process, MnS acted as the anodic phase and was preferentially dissolved. The portion of Te in Te-containing complex inclusions increased the Volta potential of the inclusions and changed the localised corrosion mechanism. The appropriate addition of Te increased the pitting potential of 15-5PH stainless steel, thereby improving its localised corrosion resistance. However, su-perfluous addition of Te resulted in corrosion-resistance attenuation. This can be attributed to the continuous cathodic effect of the larger Te portion in the complex inclusion. The dissolution of Te oxides destabilised the passivation film.
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页数：15
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