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首页> 外文会议>ASME international pipeline conference 2008 >ON THE MECHANISM OF AC ASSISTED CORROSION OF BURIED PIPELINES AND ITS CP MITIGATION
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ON THE MECHANISM OF AC ASSISTED CORROSION OF BURIED PIPELINES AND ITS CP MITIGATION

机译：埋管交流腐蚀的机理及其CP缓解

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Mechanisms of AC assisted corrosion of pipelines under cathodic protection (CP), and CP criteria for its mitigating remain still subjects of controversy. This paper presents a critical review of the fundamental understanding of the AC assisted corrosion phenomenon and also some laboratory investigation; such as the analysis of corrosion products obtained under carefully controlled AC corrosion tests using Raman spectroscopy, simultaneous recording of potential and current, and separation of this experimental overall current into its faradic and charging of the double layer capacitance contributions. For the latter, a simplified equivalent circuit model of the steel / solution interface, taking account of the interfacial and transport phenomenon was used. Results obtained are discussed:rn1. to highlight the effect on corrosion rate and corrosion feature, of some critical parameters namely AC current density, AC voltage amplitude, CP level, soil resistance between the coating defect and remote earth, and development of iron oxide layers,rn2. to devise some aspects on the mechanistic view of the phenomenon and,rn3. to comment on the CP criteria currently in use, with a special focus on the dependency of CP protection level with AC current density and voltage amplitude.
机译：在阴极保护（CP）下，交流电辅助腐蚀管道的机理及其缓解的CP标准仍然是有争议的主题。本文对AC辅助腐蚀现象的基本理解进行了批判性综述，并进行了一些实验室研究。例如使用拉曼光谱仪在经过仔细控制的交流腐蚀测试下分析腐蚀产物，同时记录电势和电流，以及将实验性总电流分离成法拉第峰并充电双层电容。对于后者，考虑了界面和传输现象，使用了钢/溶液界面的简化等效电路模型。讨论结果：为了突出对腐蚀速率和腐蚀特性的影响，需要考虑一些关键参数，例如交流电流密度，交流电压幅度，CP水平，涂层缺陷与偏远土壤之间的土壤电阻以及氧化铁层的发育，rn2。从现象的机理角度设计一些方面，对当前使用的CP标准进行评论，特别关注CP保护级别与AC电流密度和电压幅度之间的关系。

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