Effect of SRB and Applied Potential on Stress Corrosion Behavior of X80 Steel in High-pH Soil Simulated Solution
Abstract
:1. Introduction
2. Materials and Methods
2.1. Experimental Preparation
2.2. SSRT
2.3. Electrochemical Testing
3. Results
3.1. The Results of SSRT
3.2. SEM Analysis of Fracture Morphology
3.3. Polarization Curve
4. Discussion
5. Conclusions
- (1)
- X80 pipeline steel showed SCC sensitivity in a high-pH simulated solution, and the crack growth mode was TGSCC.
- (2)
- In a sterile environment, the SCC sensitivity of X80 steel greatly increased with a negative shift of applied potential. At −850 mV, the SCC mechanism was AD + HE. However, in inoculated SRB solution, the SCC sensitivity of X80 steel was the minimum at −1000 mV potential, indicating that −1000 mV had a good cathodic protection effect and significantly inhibited SRB growth. At −850 mV with SRB, the SCC mechanism was AD–membrane rupture mechanism. At −1000 mV and −1200 mV with and without SRB, the SCC mechanism was controlled by HE.
- (3)
- The applied cathodic potentials affected the X80 electrode surface state, and the metabolic activity of SRB significantly accelerated the corrosion rate of X80 steel. Poorly protective and overprotective potentials could enhance the probability of SCC.
- (4)
- The sulfide produced by SRB also promoted hydrogen penetration into the steel matrix, thus increasing the steel’s HE sensitivity. The synergistic effect of Cl− and SRB formed an oxygen concentration cell and an acidification microenvironment, which promoted the formation of pitting and induced crack nucleation, thus improving the SCC sensitivity of X80 steel.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Parameter | E (mV) | ba (mV) | bc (mV) | icorr (A/cm2) | Ecorr (mV) | |
---|---|---|---|---|---|---|
Environmental | ||||||
Without SRB | −850 mV | 126.6 | 153.1 | 0.58 × 10−5 | −863 | |
−1000 mV | 215.9 | 162.9 | 3.13 × 10−5 | −744 | ||
−1200 mV | 195.7 | 167.9 | 3.41 × 10−5 | −749 | ||
With SRB | −850 mV | 211.96 | 133 | 3.24 × 10−5 | −733 | |
−1000 mV | 278.5 | 213.4 | 1.73 × 10−5 | −828 | ||
−1200 mV | 211.3 | 174.3 | 3.48 × 10−5 | −789 |
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Xu, C.; Gao, H.; Zhu, W.; Wang, W.; Sun, C.; Chen, Y. Effect of SRB and Applied Potential on Stress Corrosion Behavior of X80 Steel in High-pH Soil Simulated Solution. Materials 2021, 14, 6981. https://0-doi-org.brum.beds.ac.uk/10.3390/ma14226981
Xu C, Gao H, Zhu W, Wang W, Sun C, Chen Y. Effect of SRB and Applied Potential on Stress Corrosion Behavior of X80 Steel in High-pH Soil Simulated Solution. Materials. 2021; 14(22):6981. https://0-doi-org.brum.beds.ac.uk/10.3390/ma14226981
Chicago/Turabian StyleXu, Congmin, Haoran Gao, Wensheng Zhu, Wenyuan Wang, Can Sun, and Yueqing Chen. 2021. "Effect of SRB and Applied Potential on Stress Corrosion Behavior of X80 Steel in High-pH Soil Simulated Solution" Materials 14, no. 22: 6981. https://0-doi-org.brum.beds.ac.uk/10.3390/ma14226981