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Materials 2017, 10(8), 851; https://doi.org/10.3390/ma10080851

Effect of Alternating Current on the Cathodic Protection and Interface Structure of X80 Steel

1
Corrosion & Protection Center, University of Science & Technology Beijing, Beijing 100083, China
2
Shanxi Electric Power Research Institute, State Grid Corporation of China, Xi’an 710054, China
*
Author to whom correspondence should be addressed.
Received: 12 June 2017 / Revised: 10 July 2017 / Accepted: 15 July 2017 / Published: 25 July 2017
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Abstract

This study employs potential-monitoring techniques, cyclic voltammetry tests, alternating current (AC) voltammetry methods, and surface characterization to investigate the AC corrosion of cathodically protected X80 pipeline steel. In a non-passive neutral solution at pH 7.2, a sufficiently negative potential completely protects steel at an AC current density of 100 A/m2. In an alkaline solution at pH 9.6, more serious AC corrosion occurs at more negative cathodic protection (CP) potential, whereas without CP the steel suffers negligible corrosion. In addition, the interface capacitance increases with AC amplitude. Based on these results, the AC corrosion mechanisms that function under various conditions are analyzed and described. View Full-Text
Keywords: AC corrosion; cathodic protection; neutral; alkaline; passivation; capacitance AC corrosion; cathodic protection; neutral; alkaline; passivation; capacitance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Wang, H.; Du, C.; Liu, Z.; Wang, L.; Ding, D. Effect of Alternating Current on the Cathodic Protection and Interface Structure of X80 Steel. Materials 2017, 10, 851.

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