5-苯基-1H-四氮唑对铜片缓蚀性能的研究

Corrosion Inhibition Property of 5-Phenyl-1H-tetrazole on Copper Strips

通过金相显微镜和接触角测试研究了5-苯基-1H-四氮唑在硫-乙醇体系中对铜的缓蚀性能。结果显示,缓蚀剂可以在铜片表面形成疏水性保护膜,有效抑制了铜片的腐蚀。电化学测试表明,当缓蚀剂浓度为70 mg/L时缓蚀效率达到87%,对铜电极有明显的缓蚀作用。通过量子化学密度泛函理论研究了缓蚀剂分子结构与缓蚀性能的关系,分析了缓蚀剂分子的活性位点。通过分子动力学模拟研究了缓蚀剂分子在Cu的(111)表面的吸附行为。

The inhibitive effect of the 5-phenyl-1H-tetrazole（ PHT） on copper in 50 mg / L sulfur-ethanol system was investigated. The inhibition performance was evaluated by means of metallographic microscopic analysis and connect angle. Results showed that the inhibitor adsorbed onto metal surface and successfully inhibited the corrosion.The Tafel polarization curves indicated that the inhibition efficiency for 87% is reached when the inhibitor concentration of PHT was 70 mg / L,so there is an inhibition effect obviously. The active region and the relation of the structure and the inhibition efficiency were verified by quantum chemistry calculation. The molecular simulation had been used to simulate the adsorption model of inhibitor molecule on Cu（ 111） surface.