物理化学学报 >> 2011, Vol. 27 >> Issue (01): 120-126.doi: 10.3866/PKU.WHXB20110117

电化学和新能源 上一篇    下一篇

抑制Q235钢CO2腐蚀的气液双相咪唑啉衍生物缓蚀剂的缓蚀行为

王彬, 杜敏, 张静   

  1. 中国海洋大学化学化工学院, 海洋化学理论与工程技术教育部重点实验室, 山东青岛266100
  • 收稿日期:2010-09-20 修回日期:2010-10-30 发布日期:2010-12-31
  • 通讯作者: 杜敏 E-mail:sdm06@126.com
  • 基金资助:

    国家自然科学基金(40806030)资助项目

Inhibition Performance of an Imidazoline Derivative as a Gas-Liquid Two-Phase Inhibitor for Q235 Steel against CO2 Corrosion

WANG Bin, DU Min, ZHANG Jing   

  1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education,College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, Shandong Province, P. R. China
  • Received:2010-09-20 Revised:2010-10-30 Published:2010-12-31
  • Contact: DU Min E-mail:sdm06@126.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (40806030).

摘要:

采用失重法、交流阻抗(EIS)及傅里叶变换红外光谱(FT-IR)、原子力显微镜(AFM)、X射线光电子能谱(XPS)等表面分析测试方法首次研究了硫脲基咪唑啉衍生物(TAI)作为抑制CO2腐蚀的气液双相缓蚀剂的缓蚀行为. 结果表明, 该硫脲基咪唑啉缓蚀剂能有效地抑制Q235 钢在气液双相中的CO2腐蚀. AFM测试结果表明该缓蚀剂能显著地降低碳钢表面的腐蚀破坏, 并且由于碳钢表面形成的缓蚀剂吸附膜的疏水作用,可在AFM探头和碳钢表面之间检测到更大的粘附力, 而探针与试样表面之间的长程静电斥力在气相中增加,在液相中由于表面电荷的屏蔽效应而减小. XPS和FT-IR 光谱测试表明液相中和气相中在碳钢表面形成吸附膜的缓蚀剂成分分别是硫脲基咪唑啉衍生物和其酸水解产物——酰胺. 以上结果也进一步证实了咪唑啉衍生物在酸性溶液中的水解机理.

关键词: CO2腐蚀, 咪唑啉衍生物, 酸水解, 傅立叶变换红外光谱, 原子力显微镜, X射线光电子能谱

Abstract:

We investigated the inhibition performance of a new imidazoline derivative inhibitor, TAI, which can be used as a gas-liquid two-phase inhibitor against CO2 corrosion by weight-loss method, electrochemical impedance spectroscopy (EIS), Fourier-transform infrared (FT-IR) spectroscopy, atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS). Results revealed that the thioureido imidazoline inhibitor was an effective inhibitor against CO2 corrosion in gas and liquid two phases. Surface analysis by AFM showed that damage to the metallic surface was considerably reduced in the presence of the TAI inhibitor. A bigger adhesive force between the AFM probe and the steel surface was detected owing to hydrophobic interaction from the inhibitors in the two phases. The long range-repulsive force between the AFM probe and the steel surface increased in gas phase but decreased in liquid phase by the screening effect of surface charges. XPS and FT-IR spectroscopy proved that the adsorption films on the metal surfaces with protective properties of TAI and acid hydrolysis products of the TAI (amides) were present in liquid phase and in gas phase, respectively. The above results further confirmed the hydrolysis mechanism of imidazoline derivatives in acid solution.

Key words: CO2 corrosion, Imidazoline derivative, Acid hydrolysis, Fourier transform infrared spectroscopy, Atomic force microscopy, X-ray photoelectron spectroscopy

MSC2000: 

  • O646