Acta Metallurgica Sinica (English Letters) >
Effect of pH Value on Stress Corrosion Cracking of X70 Pipeline Steel in Acidic Soil Environment
Received date: 2012-11-14
Revised date: 2013-04-02
Online published: 2013-07-11
Supported by
National Natural Science Foundation of China (Nos. 50901041 and 51131001), the China Postdoctoral Science Foundation (No. 20100480196), and the
Fundamental Research Funds for the Central Universities (No.FRF-TP-12-148A).
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.
Key words： X70 pipeline steel; Soil environment; pH; Stress corrosion cracking
Zhiyong LIU , Cuiwei DU , Xin ZHANG , Fuming WANG , Xiaogang LI . Effect of pH Value on Stress Corrosion Cracking of X70 Pipeline Steel in Acidic Soil Environment[J]. Acta Metallurgica Sinica (English Letters), 2013 , 26(4) : 489 -496 . DOI: 10.1007/s40195-012-0216-z
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