Relationship between electrochemical characteristics and SCC of X70 pipeline steel in an acidic soil simulated solution

doi:10.1016/S1006-7191(08)60071-X

Acta Metallurgica Sinica (English Letters) ›› 2009, Vol. 22 ›› Issue (1): 58-64.DOI: 10.1016/S1006-7191(08)60071-X

• Research paper • Previous Articles Next Articles

Relationship between electrochemical characteristics and SCC of X70 pipeline steel in an acidic soil simulated solution

Zhiyong LIU¹,Xiaogang LI¹,Yingrui ZHANG²,Cuiwei DU¹,Guoli ZHAI¹

1) Key Lab of Corrosion Erosion and Surface Technique Beijing, Corrosion and Protection Center, University of Science and Technology Beijing, Beijing100083, China
2) Mechanical Engineering Department, University of Rochester, NY, 14627, USA

Received:2008-03-03 Revised:2008-08-31 Online:2009-02-25 Published:2009-10-10
Contact: Xiaogang LI

Abstract

Abstract:

Stress corrosion cracking (SCC) of X70 pipeline steel in simulated solution of the acidic soil in Yingtan in China was investigated using slow strain rate test (SSRT), SEM and potentiodynamic polarization technique. Experiment results indicate that X70 steel is highly susceptible to SCC as applied potential reduces, which is manifested in loss of toughness and brittle fracture. Constant polarization current can detect the occurrence of SCC. The lower the polarization current is the sooner stress corrosion cracking occurs. The SCC mechanisms are different at varying potentials. When potential is higher than open circuit potential, anodic process controls SCC, whereas when potential is far lower than open circuit potential, cathodic process controls SCC, and between these two potential regions, a combined electrochemical process controls the SCC. Stress or strain has a synergistic effect with electrochemical reactions to accelerate the cathodic hydrogen evolution process, which makes the X70 pipeline steel to be more susceptible to SCC.

Key words: X70 steel, SCC, Electrochemical process, Acidic soil

Zhiyong LIU,Xiaogang LI,Yingrui ZHANG,Cuiwei DU,Guoli ZHAI. Relationship between electrochemical characteristics and SCC of X70 pipeline steel in an acidic soil simulated solution[J]. Acta Metallurgica Sinica (English Letters), 2009, 22(1): 58-64.

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Relationship between electrochemical characteristics and SCC of X70 pipeline steel in an acidic soil simulated solution

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