交流电对X80钢阴极保护及界面结构的影响

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

作者信息

Wang Huiru, Du Cuiwei, Liu Zhiyong, Wang Luntao, Ding De

机构信息

Corrosion & Protection Center, University of Science & Technology Beijing, Beijing 100083, China.

Shanxi Electric Power Research Institute, State Grid Corporation of China, Xi'an 710054, China.

出版信息

Materials (Basel). 2017 Jul 25;10(8):851. doi: 10.3390/ma10080851.

DOI:10.3390/ma10080851

PMID:28773211

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5578217/

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.

摘要

本研究采用电位监测技术、循环伏安测试、交流（AC）伏安法和表面表征来研究阴极保护的X80管线钢的交流腐蚀。在pH值为7.2的非钝化中性溶液中，足够负的电位在100 A/m²的交流电流密度下能完全保护钢材。在pH值为9.6的碱性溶液中，在更负的阴极保护（CP）电位下会发生更严重的交流腐蚀，而没有阴极保护时钢材的腐蚀可忽略不计。此外，界面电容随交流振幅的增加而增大。基于这些结果，分析并描述了在各种条件下起作用的交流腐蚀机制。