没食子酸
腐蚀
铝
吸附
缓蚀剂
水溶液
无机化学
化学
极化(电化学)
介电谱
电化学
材料科学
核化学
电极
有机化学
抗氧化剂
物理化学
作者
Przemysław Kwolek,Kamil Dychtoń,Barbara Kościelniak,Andrzej Obłój,Agnieszka Podborska,Marek Wojnicki
出处
期刊:Metals
[Multidisciplinary Digital Publishing Institute]
日期:2022-01-28
卷期号:12 (2): 250-250
被引量:23
摘要
Plant extracts are intensively studied as green corrosion inhibitors of aluminum. Because these extracts are complex systems, the influence of their individual constituents on the corrosion of aluminum should be determined. In this work, gallic acid was tested for the first time as a corrosion inhibitor of aluminum in orthophosphoric acid aqueous solution. So far, its potential inhibiting properties in acidic solutions were only suggested based on promising results obtained for various plant extracts. Evaluation of the potential inhibiting properties of gallic acid was performed using electrochemical methods. The corrosion potential, polarization curves, and impedance spectra of aluminum in 0.5 M orthophosphoric acid, at T = 303 K, were determined. The corrosion potential, corrosion current density, and corrosion rate of aluminum in orthophosphoric acid were equal to −1.151 V vs. Ag|AgCl (3M KCl) reference electrode, 36 μA∙cm−2 and 0.39 mm∙year−1, respectively. These values did not change with the addition of gallic acid. The results obtained show that gallic acid does not inhibit aluminum corrosion. UV-Vis absorption spectra of gallic acid solutions and quantum mechanical calculations show that this organic compound did not adsorb onto the aluminum surface under the studied conditions.
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