TY - JOUR
T1 - Effect of pH value on stress corrosion cracking of X70 pipeline steel in acidic soil environment
AU - Liu, Zhiyong
AU - Du, Cuiwei
AU - Zhang, Xin
AU - Wang, Fuming
AU - Li, Xiaogang
PY - 2013/8
Y1 - 2013/8
N2 - The effect of pH value on the stress corrosion cracking (SCC) of API X70 pipeline steel in simulated acidic soil solutions was investigated by using slow strain rate test, electrochemical polarization curves, electrochemical impedance spectroscopy, and scanning electron microscopy. pH plays an important role in the susceptibility and electrochemical mechanism of SCC. The pH higher than 5 has no significant effect on electrochemical processes. By contrast, the pH lower than 5 intensifies cathodic hydrogen evolution reactions, thus increasing the cathodic current and corrosion potential. Under different pH values, the SCC mechanism of X70 pipeline steel varies among anodic dissolution (AD), hydrogen embrittlement (HE), and the combination of AD and HE (AD + HE) with variations of applied potential. At -850 mVSCE, the SCC mechanism is HE if pH is less than 4 or AD + HE if pH value is more positive.
AB - The effect of pH value on the stress corrosion cracking (SCC) of API X70 pipeline steel in simulated acidic soil solutions was investigated by using slow strain rate test, electrochemical polarization curves, electrochemical impedance spectroscopy, and scanning electron microscopy. pH plays an important role in the susceptibility and electrochemical mechanism of SCC. The pH higher than 5 has no significant effect on electrochemical processes. By contrast, the pH lower than 5 intensifies cathodic hydrogen evolution reactions, thus increasing the cathodic current and corrosion potential. Under different pH values, the SCC mechanism of X70 pipeline steel varies among anodic dissolution (AD), hydrogen embrittlement (HE), and the combination of AD and HE (AD + HE) with variations of applied potential. At -850 mVSCE, the SCC mechanism is HE if pH is less than 4 or AD + HE if pH value is more positive.
KW - Soil environment
KW - Stress corrosion cracking
KW - X70 pipeline steel
KW - pH
UR - https://www.scopus.com/pages/publications/84880663258
U2 - 10.1007/s40195-012-0216-z
DO - 10.1007/s40195-012-0216-z
M3 - 文章
AN - SCOPUS:84880663258
SN - 1006-7191
VL - 26
SP - 489
EP - 496
JO - Acta Metallurgica Sinica (English Letters)
JF - Acta Metallurgica Sinica (English Letters)
IS - 4
ER -