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| SCC OF X70 PIPELINE STEEL IN SIMULATED ACID SOIL ENVIRONMENT |
| LIU Zhi-yong;Xiaogang LI |
| 北京科技大学腐蚀与防护中心 |
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Cite this article:
LIU Zhi-yong; Xiaogang LI. SCC OF X70 PIPELINE STEEL IN SIMULATED ACID SOIL ENVIRONMENT. Acta Metall Sin, 2008, 44(2): 209-214 .
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Abstract In order to study the SCC susceptibility of X70 pipeline steel in solutions which simulated the acid soil environment of Yingtan, China, slow strain rate testing (SSRT), microstructural observation of fracture areas by SEM and potentiodynamic polarization curves were used here. SCC did occur in the as-received material, with a transgranular cracking mode charged with different cathodic potential.The applied cathodic polarization potential played a important role in facilitating the occurrence of SCC.X70 pipeline steel was little sensitive to SCC in a athodic potential condition, but tended to be attacked by pits and uniform corrosion. However, as the applied cathodic potential droped, a combined electrochemical reaction of athode and cathode controlled the SCC behaviour of X70 steel, and as the applied cathodic potential droped further, cathodic reaction controlled SCC origination of X70 only. At the combined electrochemical condition, cracks occurred with pits together, which were more crowded than those at single cathodic condition at which cracks originated by themselves.
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Received: 14 June 2007
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