Pitting in the Water/Hydrocarbon Boundary Region of Pipelines-Effect of Corrosion Inhibitors

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• 作者：Guenter SchmittGilda KarbasiSrdjan Ne(s)i(c)Rudolf HauslerBrian KinsellaBruce Brown
• 会议时间：2013-09-01
• 关键词：pipelines ; steel ; pitting ; CO2 ; water/hydrocarbon ; inhibitors ; electrochemical noise
• 作者单位：Guenter Schmitt(IFINKOR-Institute for Maintenance and Corrosion Protection Technologies n.f.p.Ltd.Kalkofen 4,D-58638 Iserlohn,Germany)Gilda Karbasi(IFINKOR-Institute for Maintenance and Corrosion Protection Technologies n.f.p.Ltd.Kalkofen 4,D-58638 Iserlohn,Germany;Institute for Corrosion and Multiphase Technology Department of Chemical and Biomolecular Engineering,Ohio University,342 West State Street,Athens,Ohio 45701,USA)Srdjan Ne(s)i(c),Brian Kinsella,Bruce Brown(Institute for Corrosion and Multiphase Technology Department of Chemical and Biomolecular Engineering,Ohio University,342 West State Street,Athens,Ohio 45701,USA)Rudolf Hausler(Blade Energy Partners 8081 Diane Drive,Kaufman,Texas 75142,USA)
• 母体文献：2013中国国际管道会议暨第一届中国管道与储罐腐蚀与防护学术交流会论文集
• 会议名称：2013中国国际管道会议暨第一届中国管道与储罐腐蚀与防护学术交流会
• 会议地点：廊坊
• 主办单位：中国腐蚀与防护学会
• 语种：chi

摘要

The boundary conditions leading to pitting in pipelines in the water/hydrocarbon (HC) interface region of the bottom-of-the-line (BOL) liquid were studied using electrochemical noise (ECN) with specially developed evaluation software.It was proved that intermittent surface wetting with HC and brine can increase the likelihood of pitting in the HC/brine boundary region of the pipeline steel.The frequency of the phase boundary movement affects the pitting intensity.Corrosive effects were strongly dependent on the presence of inhibitors, its concentration and phase behaviour influenced by isopropanol.Increasing the inhibitor concentration mitigates pit formation in all surface regions.ECN measurements in combination with the in-house developed evaluation software proved to be a sensitive tool to quantify parameter effects in short exposure times.