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Open AccessArticle

A Statistical Study on the Effect of Hydrostatic Pressure on Metastable Pitting Corrosion of X70 Pipeline Steel

1
Corrosion and Protection Center, Key Laboratory for Environmental Fracture (MOE), University of Science and Technology Beijing, Beijing 100083, China
2
Department of Mechanical Engineering, University of South Florida, Tampa, FL 33620, USA
*
Author to whom correspondence should be addressed.
Materials 2017, 10(11), 1307; https://doi.org/10.3390/ma10111307
Received: 28 September 2017 / Revised: 7 November 2017 / Accepted: 10 November 2017 / Published: 14 November 2017
Hydrostatic pressure effects on pitting initiation and propagation in X70 steel are investigated by evaluating metastable pitting probability using electrochemical methods and immersion corrosion tests in containing chlorine ion solution. Potentiodynamic tests indicated that hydrostatic pressure can decrease the breakdown potential and lead to a reduced transpassivity region. Metastable test results revealed that hydrostatic pressure can increase metastable pitting formation frequency and promote stabilization of metastable pitting growth. Electrochemical impedance spectroscopy (EIS) results indicate that Hydrostatic pressure decreases the charge transfer resistance and increases the dissolution rate within the cavities. Corrosion test results also indicated that pitting initiation and propagation are accelerated by hydrostatic pressure. Result validity was verified by evaluating metastable pitting to predict pitting corrosion resistance. View Full-Text
Keywords: X70 steel; SEM; scanning kelvin probe force microscopy (SKPFM); hydrostatic pressure; potentiostatic; pitting corrosion X70 steel; SEM; scanning kelvin probe force microscopy (SKPFM); hydrostatic pressure; potentiostatic; pitting corrosion
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Yang, Z.; Kan, B.; Li, J.; Qiao, L.; Volinsky, A.A.; Su, Y. A Statistical Study on the Effect of Hydrostatic Pressure on Metastable Pitting Corrosion of X70 Pipeline Steel. Materials 2017, 10, 1307.

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