席夫碱与硝酸铈复配物对1060纯铝的缓蚀作用

Inhibition Effect of Schiff Base and Ce(NO3)3 Complex on the Corrosion of 1060 Pure Aluminum

摘要:

采用极化曲线、电化学阻抗谱、扫描电镜和能谱分析,研究合成的3-吡啶-4-氨基-1,2,4-三唑-5-硫酮席夫碱及其复配物硝酸铈在质量分数为3.5%NaCl溶液中对1060纯铝的缓蚀作用。结果表明：在293 K时席夫碱可有效抑制纯铝在3.5%NaCl溶液中的腐蚀,当席夫碱浓度为0.4 g.L_-1时缓蚀率最高,可达76.0%。席夫碱为混合型缓蚀剂,其在1060纯铝表面的吸附符合Langmuir吸附模型,且同时存在物理吸附和化学吸附。0.2 g.L_-1席夫碱与0.03 g.L_-1硝酸铈复配缓蚀率可达88.2%,二者具有协同缓蚀作用。

Abstract:

A kind of triazole Schiff base was synthesized: 3-pyridine-4-amino-1,2,4-triazole-5-thione. The inhibition effects of Schiff base and Ce(NO₃)₃ complex on corrosion of 1060 pure aluminum in 3.5% NaCl have been studied by potentiodynamic polarization, electrochemical impedance spectroscopy and scanning electron microscopy with energy dispersive spectrometer. The results show that Schiff base can effectively inhibit the corrosion of pure aluminum in NaCl solution at 293 K. When concentration of Schiff base is 0.4 g.L_-1, the inhibition efficiency is up to the highest, 76.0%. Schiff base is a mixed inhibitor, the adsorption of Schiff base on the 1060 pure aluminum surface was well fit by the Langmuir isotherm model, and there are both physisorption and chemisorption. Schiff base can inhibit the corrosion of pure aluminum and possesses a good synergistic effect with Ce(NO₃)₃, the corrosion inhibition efficiency of 0.2 g.L_-1 Schiff base and 0.03 g.L_-1 Ce(NO₃)₃ is up to 88.2%.