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合成了一系列含有羟基的双子表面活性剂:1,3-双(十二烷基二甲基氯化铵)-2-丙醇(12-3OH-12),1,3-双(十四烷基二甲基氯化铵)-2-丙醇(14-3OH-14),1,3-双(十六烷基二甲基氯化铵)-2-丙醇(16-3OH-16)和1,3-双(十八烷基二甲基氯化铵)-2-丙醇(18-3OH-18).采用静态失重法、极化曲线和交流阻抗技术研究了其在H2S/CO2腐蚀环境中对L360钢的缓蚀作用.结果表明,三种研究方法取得的结论是一致的,缓蚀效果为14-3OH-14>12-3OH-12>16-3OH-16>18-3OH-18.其中,12-3OH-12和14-3OH-14都表现出很好的缓蚀效果,在35mg·L-1的较低浓度下缓蚀率就达95%以上.极化曲线测试结果表明n-3OH-n(n=12,14,16,18)型双子表面活性剂是一种以阳极抑制为主的混合型缓蚀剂.除n=18外,其它三种双子表面活性剂n-3OH-n(n=12,14,16)在L360钢表面的吸附服从朗缪尔等温线,并且属于物理和化学混合吸附.提出了一个用来解释双子表面活性剂在H2S/CO2溶液中缓蚀机理的吸附模型.
A series of hydroxyl-containing gemini surfactants were synthesized: 1,3-bis (dodecyldimethylammonium chloride) -2-propanol (12-3OH-12), 1,3-bis Alkyldimethylammonium chloride) -2-propanol (14-3 OH-14), 1,3-bis (hexadecyldimethylammonium chloride) ) And 1,3-bis (octadecyldimethylammonium chloride) -2-propanol (18-3OH-18) were synthesized by the method of static weight loss method, polarization curves and AC impedance techniques. Corrosion inhibition of L360 steel in CO2 corrosion environment was studied.The results showed that the results obtained by the three methods were consistent and the corrosion inhibition effect was 14-3OH-14> 12-3OH-12> 16-3OH-16> 18- 3OH-18. Among them, 12-3OH-12 and 14-3OH-14 all showed good inhibition effect, and the inhibition rate reached 95% at the lower concentration of 35 mg · L-1. The results showed that n-3OH-n (n = 12, 14, 16, 18) gemini surfactant was a kind of mixed inhibitor with anode inhibition mainly.With n = 18, the other three gemini surfaces The adsorption of surfactant n-3OH-n (n = 12, 14, 16) on the surface of L360 steel obeys the Langmuir isotherm and belongs to the physical and chemical mixed adsorption.An experiment to explain the gemini surfactants’ Slow CO2 solution The mechanism of adsorption model.