2,5-二芳基-1,3,4-噻二唑衍生物的合成及缓蚀性能

发布时间：2018-06-23 23:08

本文选题：噻二唑衍生物 + 缓蚀剂　；参考：《化工学报》2015年07期

【摘要】：合成4种2,5-二芳基-1,3,4-噻二唑化合物,即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)。通过Tafel极化曲线和电化学阻抗研究4种油溶型噻二唑衍生物在50 mg·L-1硫-乙醇体系中的缓蚀性能,电化学测试表明:腐蚀液中添加噻二唑衍生物后,银片腐蚀得到抑制;随着缓蚀剂浓度增大,腐蚀电流密度减小,缓蚀效率增大;当缓蚀剂浓度为90 mg·L-1时,4种缓蚀剂DPTD、2-DHPTD、3-DHPTD和4-DHPTD的缓蚀效率分别为85.8%、94.6%、96.4%和97.1%。采用扫描电子显微镜和原子力显微镜观察其表面形貌,可知缓蚀剂在金属表面形成一层保护膜,阻止腐蚀物质与金属表面的接触,从而抑制银片腐蚀。经分子动力学分析可知,4种噻二唑衍生物吸附于金属表面遵循Langmuir等温方程,且吸附属于以化学吸附为主的混合型吸附。量子化学计算和分子动力学模拟研究表明,4种缓蚀剂均具有很好的缓蚀作用,且4种缓蚀剂的缓蚀效率大小顺序是[4-DHPDT][3-DHPDT][2-DHPDT][DPDT],这与实验结果一致。
[Abstract]:Four compounds of 2H5-diaryl-1-tiadiazole (2-DHPTD) were synthesized, that is, 2H _ 5-diphenyl -1o _ 3H _ 3H _ 3N _ 4-thiadiazole (DPTD) (DPTD), 2H _ 5- (2-hydroxybenzene) -1o _ (3) -thiadiazole (2-DHPTD), (2-DHPTD) -1HPTD (3-DHPTD), and (2-DHPTD) (2-DHPTD). Tafel polarization curve and electrochemical impedance were used to study the corrosion inhibition of four kinds of oil-soluble thiadiazole derivatives in 50 mg L-1 sulfur-ethanol system. The electrochemical tests showed that the silver strip corrosion was inhibited by adding thiadiazole derivatives to the corrosion solution. With the increase of the concentration of the inhibitor, the corrosion current density decreases and the corrosion inhibition efficiency increases. When the concentration of the inhibitor is 90 mg / L, the corrosion inhibition efficiencies of the four corrosion inhibitors are 85.8% 94.6% and 97.1%, respectively. Scanning electron microscope and atomic force microscope were used to observe the surface morphology of the metal. It was found that the corrosion inhibitor formed a protective film on the metal surface to prevent the contact between the corrosion substance and the metal surface and thus inhibit the silver sheet corrosion. The molecular dynamics analysis shows that the adsorption of four thiadiazole derivatives on the metal surface follows Langmuir isothermal equation, and the adsorption is a mixed adsorption with chemisorption. Quantum chemical calculation and molecular dynamics simulation show that the four inhibitors have good corrosion inhibition, and the order of corrosion inhibition efficiency of the four inhibitors is [4-DHPDT] [3-DHPDT] [2-DHPDT] [DPDT], which is consistent with the experimental results.
【作者单位】：渤海大学功能化合物的合成及应用辽宁省重点实验室;中国科学院大连化学物理研究所;
【基金】：国家自然科学基金项目(21176030) 辽宁省高等学校优秀人才支持计划项目(LN2011033)~~
【分类号】：TG174.42

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