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Published on: March 15, 2017
Effect of Alternating Current on the Cathodic Protection and Interface Structure of X80 Steel
Huiru Wang1, Cuiwei Du2, Zhiyong Liu3
1Corrosion & Protection Center, University of Science & Technology Beijing, Beijing 100083, China. huiruwangustb@163.com.
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.
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