ISSN 2305-6894

Anthocyanins as a corrosion inhibitor for 2024-T3 aluminum alloys: a study of electrochemical behavior

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Post-Graduate Program in Chemistry, Federal University of Rio Grande do Sul, Avenida Bento Gonçalves, 9500, Porto Alegre, Brasil

Abstract: Grape anthocyanin efficiency as a corrosion inhibitor for 2024-T3 aluminum alloy was evaluated by electrochemical techniques such as, electrochemical impedance spectroscopy and cathodic and anodic potentiodynamic polarization. The inhibitor behavior for 2024-T3 aluminum alloy was investigated in 800, 1000, 2000, 3000, 5000 and 7200 ppm of the grape anthocyanin solution in the presence of 0.025 mol·L–1 NaCl. According to electrochemical impedance spectroscopy results, the measured point dispersion in the low frequencies region decreased when the 2024-T3 aluminum alloy immersion time in the grape anthocyanin solution increased from 1 h to 3 days. It was also observed for samples after 3 days immersion that there was a reduction in the inductive behavior in the same region, and a considerable increase in the polarization resistance and inhibition efficiency for the 1000 ppm grape anthocyanin sample. Under anodic and cathodic polarization a generally better performance was also observed in the anticorrosive properties as potential and current corrosion and anti-corrosion protection efficiency for the above mentioned concentration sample. The grape anthocyanin adsorption characteristics, on the AA2024-T3 indicated similar behavior to Langmuir isotherm.

Keywords: anthocyanins; corrosion inhibition; aluminium alloy

Int. J. Corros. Scale Inhib., , 6, no. 3, 291-306 PDF (1 325 K)
doi: 10.17675/2305-6894-2017-6-3-5

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