喹啉季铵盐与金属阳离子作为盐酸酸化缓蚀剂的协同作用

Synergistic Effects of Quinoline Quaternary Ammonium Salt and Metal Cations as Hydrochloric Acid Acidizing Corrosion Inhibitor

季铵盐类缓蚀剂与金属阳离子的协同缓蚀作用广泛应用于高温酸化缓蚀剂领域,开展相关研究对于诠释高温酸化缓蚀剂多组分协同作用机理具有重要意义。合成了喹啉季铵盐缓蚀剂,研究了不同浓度的Sb2O3,CuI及NiSO4与喹啉季铵盐在20%盐酸,140℃环境中对N80钢的协同作用效果。结果表明,最优化的缓蚀剂配方为2%(质量分数)喹啉季铵盐+0.5%(质量分数)Sb2O3。针对这一最优化配方,通过表面SEM,EDS及XRD分析,研究了两种缓蚀剂组分之间的协同缓蚀作用机理。研究结果表明,喹啉季铵盐与锑化物协同作用形成复合膜是缓蚀的主要原因。增效剂Sb2O3在固液界面还原为单质Sb,沉积于金属表面,与酸化缓蚀剂主剂(成膜物质,喹啉季铵盐)共同形成复合膜,达到缓蚀作用。

Synergistic inhibition of quaternary ammonium salts and metal cations is widely used in the field of high temperature acidizing corrosion inhibitor. So it is of great significance to study the mechanism of multicomponent synergistic actions. In the study, Quinoline quaternary ammonium salt corrosion inhibitor was synthesized. The synergistic effects on N80 steel of quinoline quaternary ammonium salt and three metal cations, Sb2O3, CuI and NiSO4, were evaluated in 20%HCl at 140 ℃. The optimal formulation was obtained as follows: 2% quinoline quaternary ammonium salt+0.5% Sb2O3. Furthermore, its synergistic inhibition mechanism was studied by SEM, EDS and XRD. The results showed that the composite film formed by quinoline quaternary ammonium salt and antimony was responsible for inhibition effects. Sb2O3 was reduced to Sb at the solid-liquid interface, which formed a composite film together with the main agent of acidizing inhibitor(film-forming substance, quinoline quaternary ammonium salt) and hence produced corrosion inhibition.