交流干扰和阴极保护协同作用下的腐蚀评判标准与机理研究进展

大量交流腐蚀案例显示传统的阴极保护有效性判据在交流干扰存在时出现失效,尤其在高阴极保护水平下交流腐蚀加剧,如何评判交流干扰和阴极保护协同作用下的交流腐蚀风险,选择合适的阴极保护参数已成为实际生产的迫切需求和研究热点。本文分析了近年来国际上交流干扰评判标准的最新发展,总结了相关文献中对交流干扰及阴极保护参数的要求,并系统地阐述了高阴极保护条件下管道交流腐蚀机理的最新研究成果,分析了目前的交流腐蚀模型存在的主要问题,展望了该领域的发展趋势。

Research Progress on Evaluation Criteria and Mechanism of Corrosion Under Cathodic Protection and AC Interference

Corrosion survey on alternative current(AC)interference associated corrosion cases showed that the traditional criteria for cathodic protection(CP)is not applicable in the presence of AC interference.It is known about that in the presence of AC interference,the corrosion rate of buried pipeline even under CP of high quality is not negligible.Therefore,it was urgent to know how to evaluate the corrosion risk for the cathodically protected buried-pipelines in the presence of AC interference and how to choose the applicable CP parameter to protect pipelines.Base on that,the present criteria related with AC corrosion were analyzed and several corrosion theories have been proposed about the mechanism by which AC induces and enhances the corrosion of carbon steel in CP condition.After summarizing the AC corrosion mechanisms,the key problems are indicated and the development trend of this research field is predicted.