The Pitting Corrosion Behavior of the Austenitic Stainless Steel 308L-316L Welded Joint
Abstract
:1. Introduction
2. Materials and Methods
3. Results
3.1. Microstructure of the 308L-316L Welded Joint
3.2. Microhardness Distribution of 308L-316L Welded Joint
3.3. Electrochemical Test and Pitting Corrosion Morphology of 308L-316L Welded Joint
3.4. XPS Analysis of 308L-316L Welded Joint
4. Discussion
5. Conclusions
- WM is the most vulnerable for pits to initiate in the 308L-316L welded joint. By statistical study, there are 53.8% pits initiating at Mn, Al, and Si oxides, 23.0% in austenite, and 23.2% at interface between ferrite and austenite.
- The passive film is inhomogeneous due to lots of Cr-depleted zones such as Mn, Al, and Si oxides, carbides at interface, and austenite. It is also unstable owing to few Mo content and large residual strain.
- HAZ is slightly easier for pits corrosion, compared with the BM even though austenite distribution in the two sections is similar. This is because the residual strain in HAZ is estimated to be 9.96%, about five times higher than the BM, which accelerates the concentration of Cl ion and promotes pitting corrosion.
Author Contributions
Funding
Conflicts of Interest
References
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Section | Ecorr (mVSCE) | Epit (mVSCE) |
---|---|---|
WM | −299 ± 35 | 217 ± 77 |
HAZ | −319 ± 4 | 485 ± 23 |
BM | −295 ± 9 | 545 ± 12 |
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He, J.; Xu, S.; Ti, W.; Han, Y.; Mei, J.; Wang, X. The Pitting Corrosion Behavior of the Austenitic Stainless Steel 308L-316L Welded Joint. Metals 2020, 10, 1258. https://doi.org/10.3390/met10091258
He J, Xu S, Ti W, Han Y, Mei J, Wang X. The Pitting Corrosion Behavior of the Austenitic Stainless Steel 308L-316L Welded Joint. Metals. 2020; 10(9):1258. https://doi.org/10.3390/met10091258
Chicago/Turabian StyleHe, Jinshan, Shiguang Xu, Wenxin Ti, Yaolei Han, Jinna Mei, and Xitao Wang. 2020. "The Pitting Corrosion Behavior of the Austenitic Stainless Steel 308L-316L Welded Joint" Metals 10, no. 9: 1258. https://doi.org/10.3390/met10091258