新型抗温抗酸含磺酸基咪唑啉缓蚀剂的合成及其性能

Synthesis of a Novel Corrosion Inhibitor with Good Endurance against High Temperature and Acid and Evaluation of Its Inhibition Performance for Steel

为提高咪唑啉类缓蚀剂的抗酸抗温性能,用3-氯-2-羟基丙磺酸钠对羟基月桂酸咪唑啉进行改性,得到了一种新型的含磺酸基的抗温抗酸型咪唑啉缓蚀剂。采用红外光谱仪及核磁共振仪分析缓蚀剂及其合成中间体的结构;采用静态失重法、极化曲线法和交流阻抗法研究了不同温度下缓蚀剂在1 mol/L HCl中对P110钢的抗温抗酸性能,并探讨了其在P110钢表面的吸附行为;采用扫描电镜观察P110钢表面腐蚀形貌,采用能谱仪分析腐蚀产物成分。结果表明:缓蚀剂在HCl中对P110钢有良好的缓蚀效果,缓蚀效率均在90%以上;在相同缓蚀剂浓度下,缓蚀效率随温度升高而增大,表现出良好的抗温性能;缓蚀剂在P110钢表面的吸附过程为吸热过程,且遵循Langmuir吸附等温式,属物理吸附和化学吸附共存的混合吸附类型,且呈现出很强的化学吸附特征。

Baohu 2015,48( 05),27 ~ 30( Ch). Imidazoline hydroxyl laurate was modified with sodium 3-chloro-2-hydroxyl propyl sulfonate to afford a novel sulfonic-group-containing imidazoline inhibitor with improved endurance against high temperature and acid. The structure of as-synthesized inhibitor and its intermediates was analyzed by infrared spectrometry and nucleart resonance spectroscopy.The inhibition performance of the as- synthesized inhibitor forP110 steel in 1 mol / L HCl solution under different temperature was evaluated by weight loss method as well as polarization curve method and electrochemical impedance spectroscopy, and the adsorption behavior of the inhibitor on the steel surface was also examined. Moreover,the morphology of the corroded steel surface was observed with a scanning electron microscope,and the composition of the corrosion products was determined by energy dispersive spectrometry. Results indicated that the as-synthesized imidazoline inhibitor exhibited good inhibition performance towards P110 in HCl solution,and it provided an inhibition efficiency of above 90%. Besides,the inhibition efficiency under the same inhibitor concentration tended to rise with elevating temperature,showing good endurance against high temperature. Moreover,the adsorption process of the as-synthesized inhibitor on the steel surface was an endothermic process and followed the Langmuir isotherm,and it was a kind of physical-chemical mixed adsorption dominated by strong chemical adsorption.