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高文平,谢俊峰,计玲,赵密锋,梁建军,梁伟,吕祥鸿,赵国仙.苛刻环境中钛合金石油管材的抗腐蚀性能研究[J].稀有金属材料与工程(英文),2018,47(1):151~156.[Gao Wenping,Xie Junfeng,Ji Ling,Zhao Mifeng,Liang Jianjun,Liang Wei,Lv Xianghong and Zhao Guoxian.Study on the Corrosion Resistance of Titanium Alloy OCTG in Severe Environment[J].Rare Metal Materials and Engineering,2018,47(1):151~156.]
Study on the Corrosion Resistance of Titanium Alloy OCTG in Severe Environment
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Received:November 28, 2016  Revised:November 28, 2016
DOI:
Key words: TC4 titanium alloy  CO2 corrosion  Corrosion rate  SCC  Pitting potential  Polarization resistance.
Foundation item:国家自然科学51271146;陕西省自然科学基础研究计划2016JM5064;陕西省石油专用管腐蚀与防护重点科技创新团队基金;
Author NameAffiliation
Gao Wenping,Xie Junfeng,Ji Ling,Zhao Mifeng,Liang Jianjun,Liang Wei,Lv Xianghong and Zhao Guoxian  
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Abstract:
      The corrosion behavior and corrosion mechanism of TC4 titanium alloy OCTG in severe CO2 environment were studied with high temperature and high pressure and stress corrosion cracking (SCC) test, as well as electrochemical in-situ measurement techniques. The results show TC4 titanium alloy dominates the excellent resistance to uniform corrosion, local corrosion and SCC in high temperature and high pressure CO2 corrosion environment, and the uniform corrosion rate is only 0.0012mm/a at the temperature up to 220℃. The anodic polarization curves of TC4 titanium alloy have the obvious passivation zone in CO2 environment, and the corrosion reaction is controlled by anodic process. With temperature increased, the corrosion potential and polarization resistance of TC4 titanium alloy decrease, which indicate that the thermodynamic driving force increase, while the dynamic resistance decrease of the electrochemical corrosion, thus the corrosion rate of TC4 titanium alloy increase. However, the protective potential and pitting potential of TC4 titanium alloy are higher enough in high temperature CO2 corrosion environment, and the polarization resistance is up to 2328.2Ω.cm2 at 180℃, which still give TC4 titanium alloy the good passivation and re-passivation ability and the superior resistance to CO2 corrosion at high temperature.