Corrosion inhibition of aluminum by oxalate self-assembling monolayer

Abstract

Purpose

This paper aims to evaluate the inhibition efficiency (IE) of oxalate ions in controlling corrosion of aluminum at pH 10.

Design/methodology/approach

The IE has been determined by the classical weight loss method. The corrosion behavior of aluminum was investigated by using potentiodynamic polarization and electrochemical impedance measurements. Ultra violet (UV)-visible and Fluorescence spectra have been used to analyze the film formed on the aluminum surface after immersion.

Findings

The maximum IE was 88 per cent, which was offered by a mixture of 250 ppm oxalate ions and 50 ppm [Zn²⁺]. Potentiodynamic polarization data revealed that the protective film was formed on the metal surface. UV-visible and Fluorescence spectra indicated the presence of Al³⁺−oxalate complex in the protective film formed on aluminum substrate after immersion in [OX]/[Zn²⁺] solution.

Originality/value

The findings of this work shed more light on the corrosion inhibition of aluminum by oxalate self-assembling monolayers.

Citation

Satyabama, P., Rajendran, S. and Nguyen, T.A. (2019), "Corrosion inhibition of aluminum by oxalate self-assembling monolayer", Anti-Corrosion Methods and Materials, Vol. 66 No. 6, pp. 768-773. https://doi.org/10.1108/ACMM-01-2019-2061