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首页> 外文会议>ASME international pipeline conference >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：论埋地管道AC辅助腐蚀的机制及其CP缓解

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摘要

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: 1. 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, 2. to devise some aspects on the mechanistic view of the phenomenon and, 3. 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：阴极保护（CP）下管道的AC辅助腐蚀机制，以及其缓解的CP标准仍然是争议的仍然受试者。本文提出了对AC辅助腐蚀现象的基本理解以及一些实验室调查的关键综述;如使用拉曼光谱，同时记录潜在和电流的腐蚀产品的腐蚀产品，并将这种实验总电流分离成其法拉克和对双层电容贡献的充电。对于后者，使用钢/解决方案界面的简化等效电路模型，考虑到界面和运输现象。讨论了所得的结果：1。为了突出对腐蚀速率和腐蚀特征的影响，一些关键参数即AC电流密度，交流电压幅度，CP水平，涂层缺陷和远程地球之间的土壤阻力，以及氧化铁层的开发，2.制定某些方面对该现象的机制视图，3.评论目前正在使用的CP标准，特别关注CP保护水平与交流电流密度和电压幅度的依赖性。

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