Effect of AC current on corrosion behavior of cathodically protected Q235 steel
Effect of AC current on corrosion behavior of cathodically protected Q235 steel
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DOI：
10.1002/maco.201307234
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发表时间：
2015-03
期刊：
影响因子：
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通讯作者：
D. Tang;Yanxia Du;Min-xu Lu;Zitao Jiang;Liang Dong;J. J. Wang-J.
中科院分区：
文献类型：
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作者：
D. Tang;Yanxia Du;Min-xu Lu;Zitao Jiang;Liang Dong;J. J. Wang-J.
采用自行设计的实验电路，研究了交流电对阴极保护Q235钢在4 g/L硫酸钠模拟土壤溶液中的腐蚀速率和阴极保护电位的影响。结果表明，当交流电流密度小于300 A/m2时，增大阴极保护电流可以有效地控制腐蚀。但CP电流过大会加速Q235钢的腐蚀。此外，Q235钢的CP电位在交流电流作用下发生了较大的偏移，偏移的方向取决于外加的CP电流。在此基础上，引入考虑微电子转移的交流电流和阴极电流的共同作用，探讨了交流腐蚀的机理。
A self‐designed experiment circuit was adopted to investigate the effect of alternating current (AC) on corrosion rate and cathodic protection (CP) potential of cathodically protected Q235 steel in the simulated soil solution of 4 g/L sodium sulfate. It is found that the corrosion induced by AC current can be controlled by increasing CP current when AC current density is below 300 A/m2. However, in case that CP current is too large the corrosion of Q235 steel will be accelerated. Moreover, CP potential of Q235 steel shifts considerably due to AC current and the shift direction depends on the applied CP current. Based on the experimental results, a combination role of CP current and AC current considering micro‐electrons transfer is introduced to explore the mechanism of AC corrosion.