海底管道表面锈层对缓蚀剂效果的影响
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摘要
海底管道在投产前一般会经历输运过程和建造过程,期间饱受空气腐蚀和海水腐蚀,管道内壁极易形成锈层。本文重点讨论大气腐蚀初期薄锈层和海水腐蚀薄锈层的存在会如何影响缓蚀剂的作用效果。首先通过去离子水预浸泡和模拟海水预浸泡的方法,模拟空气腐蚀和海水腐蚀过程,然后再将带有锈层的试样进行模拟管道运行工况下的高温高压CO_2腐蚀实验,评价缓蚀剂的缓蚀效率,研究锈层对缓蚀剂效果的影响。结论显示:大气初期薄锈层及其腐蚀产物,不会显著影响缓蚀剂效果,而海水腐蚀锈层使得缓蚀剂效果明显降低。上述结论对于缓蚀剂的现场有效地应用具有一定的指导意义。
Submarine pipelines usually undergo transportation and construction before they are put into operation. During the period, they are subjected to air corrosion and seawater corrosion, and the rust layer is easily formed on the inner wall of the pipeline. This article focuses on how the presence of thin rust layer in atmospheric corrosion and thin layer of seawater corrosion affects the effectiveness of corrosion inhibitors. At first, this paper simulates air corrosion and seawater corrosion by means of pre-soaking with deionized water and seawater. Then, the sample with rust layer is subjected to high-temperature and high-pressure CO2 corrosion experiments under simulated pipeline operation conditions. The corrosion inhibition efficiency of the corrosion inhibitor was studied to investigate the effect of the rust layer on the corrosion inhibitor effectiveness. The conclusion shows that the thin rust layer and its corrosion products at the initial stage of atmosphere will not significantly affect the corrosion inhibitor effect, while the rust layer of seawater corrosion will significantly reduce the inhibition efficiency. The conclusion will provide about how the inhibitor apply in the field usefully.
Submarine pipelines usually undergo transportation and construction before they are put into operation. During the period, they are subjected to air corrosion and seawater corrosion, and the rust layer is easily formed on the inner wall of the pipeline. This article focuses on how the presence of thin rust layer in atmospheric corrosion and thin layer of seawater corrosion affects the effectiveness of corrosion inhibitors. At first, this paper simulates air corrosion and seawater corrosion by means of pre-soaking with deionized water and seawater. Then, the sample with rust layer is subjected to high-temperature and high-pressure CO2 corrosion experiments under simulated pipeline operation conditions. The corrosion inhibition efficiency of the corrosion inhibitor was studied to investigate the effect of the rust layer on the corrosion inhibitor effectiveness. The conclusion shows that the thin rust layer and its corrosion products at the initial stage of atmosphere will not significantly affect the corrosion inhibitor effect, while the rust layer of seawater corrosion will significantly reduce the inhibition efficiency. The conclusion will provide about how the inhibitor apply in the field usefully.
引文
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[2]RAMACHANDRAN S,JOVANCICEVIC V.Molecular Modeling of the Inhibition of Mild Steel CO2 Corrosion by Imidazolines[C].The 53th NACE Annual Conference.Houston:Nace,1998:17.
[3]曹楚南等.腐蚀电化学原理[M].第2版.北京:化学工业出版社,2004.
[4]RAMACHANDRAN S,CAMPBELL S,WARD M B.The Interactions and Properties of Corrosion Inhibitors with Byproduct Layers[C].The 55th NACE Annual Conference.Houston:Nace,2000:25.
[5]AMER J,SALEH S,SURYA P,et al.Corrosion and Interity Management of a Segment of Kuwait Oil Cmpany’s Pipeline Network[C].The 68th NACE Annual Conference.Houston:NACE,2013:2300.
[6]API SPEC 5L 45th(2013)《Specification for Line Pipe》[S].
[7]SY/T 5273-2014《油田采出水处理用缓蚀剂性能指标及评价方法》[S].
[8]ASTM G170-06(2012)《Standard Guide for Evaluating and Qualifying Oilfield and Refinery Corrosion Inhibitors in the Laboratory》[S].
[9]GB/T 16545-1996《金属和合金的腐蚀腐蚀试样上腐蚀产物的清除》[S].
[10]张天胜,张浩,高红等.缓蚀剂[M].第2版.北京:化学工业初版社,2008.