吕祥鸿,刘乐乐,李健,于浩波,谢俊锋.高pH值完井液中钛合金管材的腐蚀行为研究[J].稀有金属材料与工程,2020,49(7):2326~2332.[Lv Xianghong,Liu Lele,Li Jian,Yu Haobo,Xie Junfeng.Corrosion behavior of titanium alloy OCTG in high pH value completion fluid[J].Rare Metal Materials and Engineering,2020,49(7):2326~2332.]
高pH值完井液中钛合金管材的腐蚀行为研究
投稿时间:2019-05-28  修订日期:2019-06-13
中文关键词:  高pH值完井液  钛合金  腐蚀行为  钝化膜  热力学稳定性
基金项目:国家自然科学基金资助项目(51601148);陕西省自然科学基金资助项目(2016JM5064, 2018JQ5108)
中文摘要:
      在钛合金管材高温高压腐蚀实验的基础上,通过原位电化学测试以及钛合金钝化膜稳定性的分子动力学模拟和反应焓变的第一性原理计算,探讨钛合金管材在高pH值完井液的腐蚀机理。结果表明:TC4钛合金在180℃的高pH值磷酸盐完井液中的腐蚀极为严重,其均匀腐蚀速率高达0.4429mm/a;TC4钛合金在高pH值磷酸盐完井液中的腐蚀反应为阳极反应过程控制,随着温度升高,其腐蚀电位、腐蚀产物膜的膜阻和极化电阻显著降低,腐蚀反应的热力学驱动力增大、动力学阻力降低,TC4钛合金的腐蚀电流密度显著升高;在碱性溶液中,TiO2钝化膜的钛氧键发生不同程度断裂,并且随着温度升高、碱性增强,TiO2与溶液的界面结合能逐渐增大,钝化膜的热力学稳定性明显降低;在碱性焦磷酸钾溶液中,TiO2钝化膜均可与K2HPO4、K3PO4反应生成疏松多孔的KTiOPO4腐蚀产物膜,但TiO2与K3PO4反应的热力学倾向更大。
Corrosion behavior of titanium alloy OCTG in high pH value completion fluid
英文关键词:high pH value completion fluid  titanium alloy  corrosion behavior  passivation film  thermodynamic stability
英文摘要:
      Based on the high temperature and high pressure corrosion tests, the corrosion behavior of titanium alloy OCTG (oil country tubular goods) in high pH value completion fluid was studied by in-situelectrochemical measurement, the stability of titanium alloy passivation film was investigated by molecular dynamic simulation of thermodynamic, and the reaction enthalpy was calculated by using first-principles method. The results show the corrosion of TC4 alloy in high pH value phosphate completion fluid is very serious, and the uniform corrosion rate is as high as 0.4429 mm/a.The corrosion reaction of TC4 alloy in high pH value phosphate completion fluid is controlled by anodic reaction process.With the increase of temperature, the corrosion potential, the film resistance of corrosion product scale and the polarization resistance decrease significantly, the thermodynamic driving force of corrosion reaction increases, while the dynamic resistance decreases, and the corrosion current density of TC4 alloy increases significantly. In TiO2 passivation film, the titanium-oxygen bonds of TiO2 is tending to break due to the immersion of alkaline solution. Furthermore, the interfacial bonding energy between TiO2 and aqueous solution increases gradually with the increasing of temperature and alkalinity, so the thermodynamic stability of passivation film decreases. In alkaline potassium pyrophosphate solution, TiO2 passivation film can react with K2HPO4 and K3PO4 to form porous KTiOPO4 corrosion product scale, but the thermodynamic tendency of the reaction between TiO2 and K3PO4 is more obvious.
作者单位E-mail
吕祥鸿 西安石油大学材料科学与工程学院 lxhong71@sina.com.cn 
刘乐乐 西安石油大学材料科学与工程学院  
李健 西安石油大学材料科学与工程学院  
于浩波 中国石油大学(北京)新能源与材料学院  
谢俊锋 塔里木油田分公司油气工程研究院  
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