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/m 2 . 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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机译：本研究采用潜在监测技术，循环伏安法试验，交流电流（AC）伏安法，以及表面表征，以研究阴极保护的X80管道钢的交流腐蚀。在PH 7.2的非被动中性溶液中，足够负电位在100a / m 2的AC电流密度下完全保护钢。在pH9.6的碱性溶液中，在更负阴极保护（CP）电位下发生更严重的交流腐蚀，而无需CP，钢的腐蚀可忽略不计。另外，界面电容随AC幅度增加。基于这些结果，分析和描述了在各种条件下起作用的交流腐蚀机制。
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