Resumo

VASHI, R. T.; ZELE, S. A.  e  PRAJAPATI, N. I.. Inhibitive Action of Aniline on Zinc Corrosion in a H₂SO₄ Solution: Electrochemical Study. Port. Electrochim. Acta [online]. 2022, vol.40, n.2, pp.107-116.  Epub 30-Abr-2022. ISSN 0872-1904.  https://doi.org/10.4152/pea.2022400205.

Aniline corrosion inhibitor effect on zinc in a H2SO4 solution has been evaluated by weight loss (WL), potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS) and Scanning Electron Microscope (SEM) techniques. The corrosion rate increased with higher acid concentrations. At constant inhibitor content, with higher acid concentrations, the corrosion rate increased. With higher inhibitor concentrations the corrosion rate decreased, while inhibition efficiency (IE) percentage increased. The maximum IE of 90.18% was obtained at 60 mM of aniline in a 0.5 M H2SO4 solution. Polarization studies revealed that aniline acts as a mixed type inhibitor. EIS spectra are semicircular, which indicates that zinc corrosion was mainly controlled by a charge transfer process. SEM reveals the appearance of a smooth surface on zinc in aniline presence, probably due to the formation of an adsorptive film of electrostatic character. It was found that there is a good agreement between the different tested techniques.

Palavras-chave : Zinc; H₂SO₄; aniline effect; polarization; EIS.

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