TY - JOUR
T1 - Effect of pH and chloride on the micro-mechanism of pitting corrosion for high strength pipeline steel in aerated NaCl solutions
AU - Wang, Yafei
AU - Cheng, Guangxu
AU - Wu, Wei
AU - Qiao, Qiao
AU - Li, Yun
AU - Li, Xiufeng
N1 - Funding Information:
The authors gratefully acknowledge the financial support by the National Natural Science Foundation of China (grant no. 51175403 ).
Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.
PY - 2015/9/15
Y1 - 2015/9/15
N2 - The pitting corrosion mechanism of high strength pipeline steel in aerated NaCl solutions with different pH and chloride content was investigated, using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and scanning electron microscope (SEM). The pitting behavior in alkaline solutions was found to be significantly different from that in neutral and acidic solutions. Electrochemical results and SEM images indicate that the product film formed on the steel surface results in different corrosion behavior in an alkaline solution. SEM images show that pH and chloride concentration in the bulk solution have a great influence on the pitting morphology. Unique large pit morphology due to corrosion in neutral/acidic solutions with 0.05 mol/L NaCl was observed. The relationship between solution pH and the effect of chloride concentration is also discussed.
AB - The pitting corrosion mechanism of high strength pipeline steel in aerated NaCl solutions with different pH and chloride content was investigated, using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and scanning electron microscope (SEM). The pitting behavior in alkaline solutions was found to be significantly different from that in neutral and acidic solutions. Electrochemical results and SEM images indicate that the product film formed on the steel surface results in different corrosion behavior in an alkaline solution. SEM images show that pH and chloride concentration in the bulk solution have a great influence on the pitting morphology. Unique large pit morphology due to corrosion in neutral/acidic solutions with 0.05 mol/L NaCl was observed. The relationship between solution pH and the effect of chloride concentration is also discussed.
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U2 - 10.1016/j.apsusc.2015.05.053
DO - 10.1016/j.apsusc.2015.05.053
M3 - Article
AN - SCOPUS:84937719673
SN - 0169-4332
VL - 349
SP - 746
EP - 756
JO - Applied Surface Science
JF - Applied Surface Science
ER -