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Materials 2017, 10(7), 720; doi:10.3390/ma10070720

Corrosion Behavior of X80 Steel with Coupled Coating Defects under Alternating Current Interference in Alkaline Environment

1
Department of Chemical and Biomolecular Engineering, Institute for Corrosion and Multiphase Technology, Ohio University, Athens, OH 45701, USA
2
Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Received: 7 May 2017 / Revised: 19 June 2017 / Accepted: 20 June 2017 / Published: 28 June 2017
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Abstract

The corrosion behavior of X80 steel in the presence of coupled coating defects was simulated and studied under the interference of alternating current (AC) in an alkaline environment. The results from electrochemical measurements showed that the electrode potential of the coating defect with the smaller exposed area was lower than that with the larger area, which indicated that the steel with the smaller coating defect was more prone to corrosion. The result of weight loss tests also showed that the smaller coating defect had induced a higher corrosion rate. However, the corrosion rate of X80 steel at the larger coating defect decreased gradually with the increase of the larger defect area at a constant smaller defect area. The corrosion morphology images showed that the coating defects with smaller areas suffered from more severe pitting corrosion. View Full-Text
Keywords: corrosion; X80 steel; coating defect; alternating current interference corrosion; X80 steel; coating defect; alternating current interference
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Li, Z.; Li, C.; Qian, H.; Li, J.; Huang, L.; Du, C. Corrosion Behavior of X80 Steel with Coupled Coating Defects under Alternating Current Interference in Alkaline Environment. Materials 2017, 10, 720.

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