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In Situ Assessment of Pitting Corrosion and Its Inhibition Using a Localized Corrosion Monitoring Technique

机译：使用局部腐蚀监测技术现场评估点蚀及其抑制

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摘要

Pitting corrosion of pipelines remains a serious concern to operators in the oil and gas industry. Pitting is a particularly insidious and extremely rapid form of attack of a metal structure that can lead to unexpected system failures. The pipe wall can be perforated within a relatively short space of time with no appreciable metal loss on the pipeline as a whole. Corrosion inhibitors are widely used by operators to maintain asset integrity, and their effect on controlling general corrosion to acceptable levels is easily demonstrated by the use of weight-loss coupons or techniques such as linear polarization resistance (LPR). However, up to 80% of pipeline failures are ascribed to pitting, but very few monitoring methods are capable to show this outcome. This paper discusses a localized corrosion monitoring (LCM) technique, which has been utilized to provide in situ quantitative assessment of pitting corrosion under laboratory-simulated wet sour gas operating conditions. The predicted pitting damage by LCM was subsequently verified using a calibrated white light interferometer (WLI). Examples of the assessment of corrosion inhibitors in terms of their pitting inhibition performance using LCM and the WLI are provided. It should be noted that the primary purpose of this paper is not to evaluate the performance of corrosion inhibitors per se but the selected examples in this paper are to illustrate the capability of LCM in providing qualitative and quantitative information of pitting corrosion under laboratory testing conditions. [PUBLICATION ABSTRACT]
机译：管道的点蚀仍然是石油和天然气行业操作人员严重关注的问题。点蚀是对金属结构的特别隐蔽和极其快速的攻击形式，可能导致系统意外故障。可以在较短的时间内对管壁进行打孔，并且整个管道上不会出现明显的金属损失。运营商广泛使用腐蚀抑制剂来维持资产的完整性，并且通过使用减重片或诸如线性极化电阻（LPR）之类的技术很容易证明其在将一般腐蚀控制在可接受水平上的作用。但是，多达80％的管道故障归因于点蚀，但是很少有监测方法能够显示出这种结果。本文讨论了一种局部腐蚀监测（LCM）技术，该技术已用于在实验室模拟的湿含硫气体运行条件下对蚀坑腐蚀进行现场定量评估。随后使用校准的白光干涉仪（WLI）验证了LCM所预测的点蚀损伤。提供了使用LCM和WLI就腐蚀抑制剂的防点蚀性能进行评估的示例。应该注意的是，本文的主要目的不是评估腐蚀抑制剂本身的性能，而是本文中选择的例子是为了说明LCM在实验室测试条件下提供点蚀的定性和定量信息的能力。 [出版物摘要]

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  • 来源
    《Corrosion》 |2010年第6期|p.1-18|共18页
  • 作者

    J J Moloney W Y Mok C M Menendez;

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    J.J. Moloney/* W.Y. Mok,*andC.M. Menendez**Submitted for publication November 17, 2009.* Corresponding author. Email: jeremy.moloney@bakerhughes.com.* Baker Hughes Incorporated, Kirkby Bank Road, Knowsley Industrial Park, Liverpool, L33 7SY. United Kingdom.** Baker Hughes Incorporated, 12645 West Airport Blvd., Sugar Land, Texas, 77478.;

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