硫脲基松香咪唑啉季铵盐的合成、性能及缓蚀机理

Synthesis,Performance and Inhibition Mechanism of Thiourea Base Rosin Imidazoline Quaternary Ammonium Salt

以松香、二乙烯三胺、3-氯-2-羟基丙烷磺酸钠和硫脲为主剂合成了硫脲基松香咪唑啉季铵盐,对其结构进行了红外和核磁(^(13)CNMR)表征。通过静态失重法和电化学方法考察了硫脲基松香咪唑啉季铵盐在酸性介质中的缓蚀性能,结合成膜理论以及缓蚀剂的分子结构,对自制缓蚀剂的缓蚀机理做出了解释。结果表明:303 K下,在质量分数为15%的盐酸介质中加入占盐酸质量0.4%的硫脲基松香咪唑啉季铵盐,其缓蚀率可达90.81%;自制缓蚀剂吸附在碳钢表面形成吸附膜,从而起到缓蚀作用。

Thiourea base rosin imidazoline quaternary ammonium salt was synthesized from rosin,diethylenetriamine,3-chlorinum-2-hydroxyl propane sulfonic acid sodium and thiourea. Its structure was characterized by FTIR and ^（13）CNMR. Its corrosion inhibition was evaluated by methods of static weight loss test and electrochemical test in acidic medium. The corrosion-inhibition mechanism of the corrosion inhibitor was explained by the theory of film formation and the molecular structure of the corrosion inhibitor. The results showed that the resulting inhibitor had excellent corrosion inhibition efficiency. The inhibition efficiency could reach 90. 81% in 15% mass fraction of hydrochloric acid and 0. 4% imidazoline corrosion inhibitor（based on hydrochloric acid mass） at 303 K. The prepared corrosion inhibitor could form a absorption film on the surface of carbon steel,which protected the metal against further corrosion.