2,5-二芳基-噻二唑的合成及其缓蚀性能研究

Synthesis of 2,5-diaryl-thiadiazole and its corrosion inhibition for silver strip

合成了四种噻二唑衍生物:2,5-二苯基-1,3,4-噻二唑(DPTD),2,5-二(2-羟基苯)-1,3,4-噻二唑(2-DHPTD),2,5-二(3-羟基苯)-1,3,4-噻二唑(3-DHPTD)和2,5-二(4-羟基苯)-1,3,4-噻二唑(4-DHPTD)。采用Tafel极化测试、电化学阻抗谱(EIS)和扫描电子显微镜(SEM)研究了噻二唑衍生物在50 mg·L-1硫-乙醇体系中对银的缓蚀作用。实验结果表明:添加缓蚀剂后,银片腐蚀得到抑制,且缓蚀效率大小顺序为:[DPDT]<[2-DHPDT]<[3-DHPDT]<[4-DHPDT]。通过量子化学计算和分子动力学模拟进一步研究了四种噻二唑衍生物的缓蚀机理,理论计算结果与实验结果一致。

Four thiadiazole derivatives,namely,2,5-diphenly-1,3,4-thiadiazole（ DPTD）,2,5-di（ 2-hydroxyphenly）-1,3,4-thiadiazole（ 2-DHPTD）,2,5-di（ 3-hydroxyphenly）-1,3,4-thiadiazole（ 3-DHPTD）,and 2,5-di（ 4-hydroxy phenly）-1,3,4-thiadiazole（ 4-DHPTD） were synthesized. The inhibition of silver strip corrosion in 50 mg·L^-1 sulfur-ethanol system by thiadiazole derivatives were evaluated using Tafel polarization technique,electrochemical impedance spectroscopy（ EIS）,and scanning electron microscopy（ SEM）. The results indicated that the addition inhibited silver strip corrosion,and the inhibition efficiency increase in the order[DPDT][2-DHPDT][3-DHPDT][4-DHPDT]. The mechanism of corrosion inhibition was studied by quantum chemistry calculation and molecular dynamics simulation. The theoretical results agreed with the experimental results.