Effect of pH Value on Stress Corrosion Cracking of X70 Pipeline Steel in Acidic Soil Environment

doi:10.1007/s40195-012-0216-z

Acta Metallurgica Sinica (English Letters) ›› 2013, Vol. 26 ›› Issue (4): 489-496.DOI: 10.1007/s40195-012-0216-z

Effect of pH Value on Stress Corrosion Cracking of X70 Pipeline Steel in Acidic Soil Environment

Zhiyong LIU^1,3), Cuiwei DU¹⁾, Xin ZHANG²⁾, Fuming WANG²⁾,Xiaogang LI¹⁾

1)Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
2)Nuclear and Radiation Safety Center,Ministry of Environmental Protection of China, Beijing 100082,China

3)School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received:2012-11-14 Revised:2013-04-02 Online:2013-08-25 Published:2013-07-11
Contact: Xiaogang LI
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).

Abstract

Abstract:

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 mV_SCE, 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.

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Effect of pH Value on Stress Corrosion Cracking of X70 Pipeline Steel in Acidic Soil Environment

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