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首页> 外文期刊>International Journal of Electrochemical Science >Mechanism of Corrosion and Corrosion Inhibition of Tin in Aqueous Solutions Containing Tartaric Acid
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Mechanism of Corrosion and Corrosion Inhibition of Tin in Aqueous Solutions Containing Tartaric Acid

机译：含酒石酸水溶液中锡的腐蚀与缓蚀机理

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摘要

The electrochemical behavior of tin metal in tartaric acid solutions of different concentrations wasinvestigated. Some amino acids, namely, alanine, glycine, glutamic acid and histidine were used asenvironmentally safe inhibitors for the tin dissolution process. Different electrochemical techniquesincluding, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were used.The metal surface was examined via scanning electron microscopy (SEM). The E/I curves showed thatthe anodic behavior of tin exhibits active/passive transition. The active dissolution of tin was increasedby increasing tartaric acid concentration. Glycine was found to give the highest corrosion inhibition-3 efficiency at a concentration of 0.02 mol dm . The corrosion inhibition process is based on theadsorption of the amino acid molecules on the metal surface. The adsorption process was found toobey the Freundlich isotherm, and the adsorption of glycine on Sn has an adsorption free energy of - 10.2 kJ/mol which reveals physical adsorption of the amino acid molecules on the metal surface. Theexperimental impedance data are in good agreement with the polarization experiments. An equivalentcircuit model was proposed for fitting of the experimental impedance data, and to simulate theelectrode/electrolyte interface.
机译：研究了锡金属在不同浓度的酒石酸溶液中的电化学行为。一些氨基酸，即丙氨酸，甘氨酸，谷氨酸和组氨酸被用作锡溶解过程的环境安全抑制剂。使用了不同的电化学技术，包括电势极化和电化学阻抗谱（EIS）。通过扫描电子显微镜（SEM）检查金属表面。 E / I曲线表明，锡的阳极行为表现出主动/被动转变。锡的活性溶解通过增加酒石酸浓度而增加。发现甘氨酸在0.02mol dm 2的浓度下具有最高的腐蚀抑制-3效率。腐蚀抑制过程是基于氨基酸分子在金属表面上的吸附。发现其吸附过程遵循弗氏等温线，甘氨酸在Sn上的吸附自由能为-10.2 kJ / mol，表明氨基酸分子在金属表面上的物理吸附。实验阻抗数据与极化实验吻合良好。提出了等效电路模型，用于拟合实验阻抗数据，并模拟电极/电解质界面。

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