HCl溶液中1,2-二(苯并咪唑-2-硫基)乙烷对碳钢的缓蚀行为研究

Inhibitive performance of 1,2-bis((1H-benzo[d]imidazol-2-ylthio) ethane for mild steel in HCl solution

合成了缓蚀剂1,2-二(苯并咪唑-2-硫基)乙烷((bit)_2E),用元素分析、红外光谱、核磁共振谱和液质联用技术确证了缓蚀剂的分子结构。用静态失重法、动电位极化曲线法和扫描电子显微镜评价了(bit)_2E在HCl溶液中对碳钢的缓蚀性能。结果表明(bit)_2E是一种混合型缓蚀剂,缓蚀率随缓蚀剂浓度增加而增大,随HCl浓度增大而减小,受腐蚀体系温度和放置时间影响较小。在30℃的1.0 mol·L^(-1)HCl溶液中,(bit)_2E浓度为1.0×10^(-3)mol·L^(-1)时的缓蚀率为95.68%。(bit)_2E作为新型缓蚀剂在碳钢表面上的吸附符合Langmuir吸附等温方程式,属于自发进行的物理和化学吸附。

A organic inhibitor, 1,2-bis（ li/-benzo[ d] imidazol-2-ylthio） ethane （ （ bit） 2 E ） , was synthe sized and characterized b y ele-mental analysis,IR,NMR and LCMS. The synthesized compound of（bit）2E as a novel corrosion inhibitor for mild steel in HC1 solu-tion was evaluated by weight loss measurement,potentiodynamic polarization and SEM analysis. The results showed that（bit）2E ac-ted as a mixed type inhibitor,the inhibition efficiency increased with（ bit）2E concentration increasing,which was up to 95. 6 8 % with （bit） 2E concentration of 1. O× 10 .3 mol · L -1 in 1. 0 mol ·L -4 HCl solution at 30℃. M eanwhile, the inhibition efficiency w a s less af-fected by temperature of corrosion solution and storage time,and it decreased with HC1 concentration. In addition,the adsorption of （bit）2E on mild steel surface obeied Langmuir isotherm,and the corrosion inhibition belonged to both physic-and chemisorptions.