一种咪唑啉类缓蚀剂的合成及其缓蚀性能评价

实验以1-甲基咪唑、1,4-丁烷磺内酯和浓硫酸为原料合成咪唑类缓蚀剂。采用失重法和电化学方法研究该缓蚀剂浓度以及腐蚀溶液温度对X100管线钢在5% (质量分数) HCl溶液中缓蚀性能的影响。结果表明：该缓蚀剂为混合型缓蚀剂,同一温度条件下,缓蚀效率随着浓度的增加而增加,同一浓度条件下,缓蚀效率则随着温度升高而降低。为了进一步阐述缓蚀剂吸附机理,对腐蚀活化能及相关热力学参数如焓 (H)、熵 (S)、吸附平衡常数 (K_ads) 和标准自由能 (G_ads) 进行了计算,结果表明该缓蚀剂在X100表面为物理吸附。

Synthesis Corrosion Inhibition Performance of a New Imidazoline Inhibitor

A new imidazoline inhibitor was synthesized using 1-methylimidazole, 1,4-butane sultone and concentrated sulfuric acid as raw materials and then of which the corrosion inhibition on X100 pipeline steel in 5%HCl was examined by means of weight loss method and electrochemical technology. The results showed that the inhibitor is a mixed type inhibitor. The inhibition efficiency increased with the increasing inhibitor concentration, while decreased with the increase of temperature. The activation energy of corrosion and the relevant thermodynamic parameters such as enthalpy, entropy, adsorption equilibrium constants and standard free energy ect were acquired so that to reveal the mechanism of corrosion inhibition. The results showed that the corrosion inhibitor was physically adsorbed on the X100 steel surface.