Effect of SRB and Applied Potential on Stress Corrosion Behavior of X80 Steel in High-pH Soil Simulated Solution
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...
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2021
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oai:doaj.org-article:78ef5539d84e4924a3b272fc845792bc2021-11-25T18:15:26ZEffect of SRB and Applied Potential on Stress Corrosion Behavior of X80 Steel in High-pH Soil Simulated Solution10.3390/ma142269811996-1944https://doaj.org/article/78ef5539d84e4924a3b272fc845792bc2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/22/6981https://doaj.org/toc/1996-1944The 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<sup>−</sup> 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.Congmin XuHaoran GaoWensheng ZhuWenyuan WangCan SunYueqing ChenMDPI AGarticleX80 pipeline steelhigh-pH soil simulated solutionstress corrosion sensitivitycathodic protection potentialsulfate-reducing bacteriaTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6981, p 6981 (2021) |
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DOAJ |
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DOAJ |
| language |
EN |
| topic |
X80 pipeline steel high-pH soil simulated solution stress corrosion sensitivity cathodic protection potential sulfate-reducing bacteria Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 |
| spellingShingle |
X80 pipeline steel high-pH soil simulated solution stress corrosion sensitivity cathodic protection potential sulfate-reducing bacteria Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Congmin Xu Haoran Gao Wensheng Zhu Wenyuan Wang Can Sun Yueqing Chen Effect of SRB and Applied Potential on Stress Corrosion Behavior of X80 Steel in High-pH Soil Simulated Solution |
| 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<sup>−</sup> 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. |
| format |
article |
| author |
Congmin Xu Haoran Gao Wensheng Zhu Wenyuan Wang Can Sun Yueqing Chen |
| author_facet |
Congmin Xu Haoran Gao Wensheng Zhu Wenyuan Wang Can Sun Yueqing Chen |
| author_sort |
Congmin Xu |
| title |
Effect of SRB and Applied Potential on Stress Corrosion Behavior of X80 Steel in High-pH Soil Simulated Solution |
| title_short |
Effect of SRB and Applied Potential on Stress Corrosion Behavior of X80 Steel in High-pH Soil Simulated Solution |
| title_full |
Effect of SRB and Applied Potential on Stress Corrosion Behavior of X80 Steel in High-pH Soil Simulated Solution |
| title_fullStr |
Effect of SRB and Applied Potential on Stress Corrosion Behavior of X80 Steel in High-pH Soil Simulated Solution |
| title_full_unstemmed |
Effect of SRB and Applied Potential on Stress Corrosion Behavior of X80 Steel in High-pH Soil Simulated Solution |
| title_sort |
effect of srb and applied potential on stress corrosion behavior of x80 steel in high-ph soil simulated solution |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/78ef5539d84e4924a3b272fc845792bc |
| work_keys_str_mv |
AT congminxu effectofsrbandappliedpotentialonstresscorrosionbehaviorofx80steelinhighphsoilsimulatedsolution AT haorangao effectofsrbandappliedpotentialonstresscorrosionbehaviorofx80steelinhighphsoilsimulatedsolution AT wenshengzhu effectofsrbandappliedpotentialonstresscorrosionbehaviorofx80steelinhighphsoilsimulatedsolution AT wenyuanwang effectofsrbandappliedpotentialonstresscorrosionbehaviorofx80steelinhighphsoilsimulatedsolution AT cansun effectofsrbandappliedpotentialonstresscorrosionbehaviorofx80steelinhighphsoilsimulatedsolution AT yueqingchen effectofsrbandappliedpotentialonstresscorrosionbehaviorofx80steelinhighphsoilsimulatedsolution |
| _version_ |
1718411444905574400 |