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首页> 外文期刊>Journal of loss prevention in the process industries >A mathematical model of crevice corrosion for buried pipeline with disbonded coatings under cathodic protection
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A mathematical model of crevice corrosion for buried pipeline with disbonded coatings under cathodic protection

机译：阴极保护下脱层地下管道裂缝腐蚀的数学模型

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摘要

Crevice corrosion occurs in a holiday and disbonded region between coating and pipeline steel. Cathodic protection (CP) is generally recognized as the most effective method for corrosion prevention of pipeline, but its effectiveness may be reduced at defects in a disbonded coating. It is difficult to measure and probe corrosion parameters accurately based on experimental work. Therefore, a mathematical model is necessary to identify the phenomena and mechanisms that contribute to the crevice corrosion process. In this work, a mathematical model was developed to determine the evolution of chemical and electrochemical transient processes of crevice corrosion in NaCl dilute solution, and the effect of cathodic protection and crevice width on corrosion of 20# steel pipeline with disbonded coatings. Results have demonstrated that the extent of crevice corrosion depends on the crevice geometry and could be influenced by the increase of crevice depth and decrease of its width. The oxygen concentrations drop significantly inside a crevice whether CP is applied or not and whether crevice width decreased or not. The pH values and conductivity of crevice solution increase with the time. The research provides a theoretical foundation for cathodic protection of pipelines and establishes an effective corrosion model which can identify the phenomena and mechanisms of the crevice corrosion process. This work could be used to help mitigate the corrosion failure of pipelines to prevent catastrophic accidents in oil, gas and chemical process industries. (C) 2016 Elsevier Ltd. All rights reserved.
机译：缝隙腐蚀发生在涂层和管线钢之间的空隙和脱开区域。阴极保护（CP）通常被认为是预防管道腐蚀的最有效方法，但是在剥离涂层的缺陷处其有效性可能会降低。根据实验工作很难准确地测量和探测腐蚀参数。因此，必须有一个数学模型来识别造成缝隙腐蚀过程的现象和机理。在这项工作中，建立了一个数学模型来确定NaCl稀溶液中缝隙腐蚀的化学和电化学瞬态过程的演变，以及阴极保护和缝隙宽度对带剥离涂层的20＃钢管腐蚀的影响。结果表明，缝隙腐蚀的程度取决于缝隙的几何形状，并可能受缝隙深度增加和宽度减小的影响。无论是否施加CP以及缝隙宽度是否减小，缝隙内的氧气浓度都会显着下降。缝隙溶液的pH值和电导率随时间增加。该研究为管道的阴极保护提供了理论基础，并建立了有效的腐蚀模型，可以识别出缝隙腐蚀过程的现象和机理。这项工作可用于帮助减轻管道的腐蚀故障，以防止石油，天然气和化学加工行业发生灾难性事故。 （C）2016 Elsevier Ltd.保留所有权利。

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