NDLI: Effect of SRB and Applied Potential on Stress Corrosion Behavior of X80 Steel in High-pH Soil Simulated Solution

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Effect of SRB and Applied Potential on Stress Corrosion Behavior of X80 Steel in High-pH Soil Simulated Solution

Content Provider	MDPI
Author	Xu, Congmin Gao, Haoran Zhu, Wensheng Wang, Wenyuan Sun, Can Chen, Yueqing
Copyright Year	2021
Description	The effect of SRB and applied potential on the stress corrosion sensitivity of X80 pipeline steel was analyzed in high-pH soil simulated solution under different conditions using a slow strain rate tensile test, electrochemical test, and electronic microanalysis. The experimental results showed that X80 pipeline steel has a certain degree of SCC sensitivity in high-pH simulated solution, and the crack growth mode was trans-granular stress corrosion cracking. In a sterile environment, the SCC mechanism of X80 steel was a mixture mechanism of anode dissolution and hydrogen embrittlement at −850 mV potential, while X80 steel had the lowest SCC sensitivity due to the weak effect of AD and HE; after Sulfate Reducing Bacteria (SRB) were inoculated, the SCC mechanism of X80 steel was an AD–membrane rupture mechanism at −850 mV potential. The synergistic effect of $Cl^{−}$ and SRB formed an oxygen concentration cell and an acidification microenvironment in the pitting corrosion pit, and this promoted the formation of pitting corrosion which induced crack nucleation, thus significantly improving the SCC sensitivity of X80 steel. The strong cathodic polarization promoted the local corrosion caused by SRB metabolism in the presence of bacteria, whereby the SCC sensitivity in the presence of bacteria was higher than that in sterile conditions under strong cathodic potential.
Starting Page	6981
e-ISSN	19961944
DOI	10.3390/ma14226981
Journal	Materials
Issue Number	22
Volume Number	14
Language	English
Publisher	MDPI
Publisher Date	2021-11-18
Access Restriction	Open
Subject Keyword	Materials Soil Science X80 Pipeline Steel High-ph Soil Simulated Solution Stress Corrosion Sensitivity Cathodic Protection Potential Sulfate-reducing Bacteria
Content Type	Text
Resource Type	Article

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