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Inhibition of Tryptophan on AA 2024 in Chloride-Containing Solutions

机译：色氨酸对含氯溶液中AA 2024的抑制作用

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摘要

The inhibitory effects of tryptophan on the corrosion of AA 2024 in 1 M HCl, 20% (wt.%) CaCl_2, and 3.5% (wt.%) NaCl solutions were investigated via polarization techniques, electrochemical impedance spectroscopy, and weight loss methods. The scanning electron microscope technique was employed to observe corrosion morphology. The results suggest that AA 2024 was corroded in these three corrosive media to some extent and that tryptophan can significantly inhibit the corrosion of aluminum alloys. The inhibition efficiency (η) increased with increasing concentrations of tryptophan, and the best inhibition efficiency exhibited was about 87% in 1 M HCl solution with 0.008 M tryptophan. Tryptophan acted as a cathodic corrosion inhibitor and affected the hydrogen evolution reaction, which was the main electrode reaction in the 1 M HCl solution. In solutions with 20% CaCl_2 and 3.5% NaCl, tryptophan was adsorbed onto anodic areas, thus increasing the activation energy of the interface reaction as an anodic corrosion inhibitor. The Dmol~3 program of Material Studio 4.0 was used to obtain the optimized geometry of the tryptophan inhibitor and some quantum-chemical parameters. Front orbital distributions and Fukui indices indicate that the molecular active reaction zones were located in the indole ring of tryptophan.
机译：通过极化技术，电化学阻抗谱和失重法研究了色氨酸对AA 2024在1 M HCl，20％（wt。％）CaCl_2和3.5％（wt。％）NaCl溶液中的腐蚀的抑制作用。用扫描电子显微镜技术观察腐蚀形态。结果表明AA 2024在这三种腐蚀介质中均受到一定程度的腐蚀，色氨酸可以显着抑制铝合金的腐蚀。抑制效率（η）随着色氨酸浓度的增加而增加，在含0.008 M色氨酸的1 M HCl溶液中，表现出的最佳抑制效率约为87％。色氨酸充当阴极腐蚀抑制剂，并影响氢的释放反应，这是1 M HCl溶液中的主要电极反应。在含20％CaCl_2和3.5％NaCl的溶液中，色氨酸被吸附到阳极区域，因此增加了作为阳极腐蚀抑制剂的界面反应的活化能。使用Material Studio 4.0的Dmol〜3程序获得色氨酸抑制剂的最佳几何构型和一些量子化学参数。前轨道分布和Fukui指数表明分子活性反应区位于色氨酸的吲哚环中。

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