月桂酸咪唑啉硫酸酯盐缓蚀剂在A3钢表面吸附成膜行为

摘要

The inhibition performance and adsorption mechanism of lauryl imidazoline sulfuric ester on the A3 steel surface have been studied using weight loss method,contact angle test,atomic force microscope,and X-ray photoelectron spectroscopy. The film-forming mechanism on the A3 steel surface was also discussed. The results indicated that LIMS molecules adsorption film could inhibit the corrosion of A3 steel significantly. Inhibition efficiency increased with the increase of mass concentration. The inhibition efficiency was above 90% at a mass concentration of 800mg/L at the temperature range of 298—318K. LIMS could form adsorbed film on metal surface,it was from hydrophobic film of long chain alkyl and strong effect between N,S,O and metal surface. Contact angle of film-forming steel surface increased with the mass concentration of LIMS. The contact angle was up to 103.51°. The higher the contact angle was,the higher the density of the adsorption film was.%采用失重法、接触角测试、原子力显微镜和 X 射线光电子能谱等分析方法研究了实验室自制月桂酸咪唑啉硫酸酯盐缓蚀剂（LIMS）在盐酸溶液中对A3钢的缓蚀吸附行为，同时探讨了LIMS在A3钢表面的成膜行为和作用机理。结果表明，月桂酸咪唑啉硫酸酯盐缓蚀剂LIMS分子可以明显抑制A3钢在盐酸溶液中的腐蚀，随着盐酸溶液中LIMS质量浓度的增加，缓蚀率增加。当LIMS质量浓度为800mg/L时，在298～318K温度范围内缓蚀效果良好，缓蚀率可达90%以上。LIMS可在金属表面形成一层吸附膜，这种吸附膜来源于长链烷基在金属表面形成的疏水薄膜和N、S、O与金属表面的强烈作用，成膜试片表面的接触角随着缓蚀剂质量浓度的增加而增大，接触角可达103.51°，接触角增大，吸附膜作用增强，致密性越好。