Study on polyaniline‐ZnO used as corrosion inhibitors of 57S aluminium in 2 M NaOH solution

Abstract

Purpose

The purpose of this paper is to study to minimize the self‐corrosion rate of Type 57S aluminium containing (97.7 per cent Al, 2 per cent Mn and 0.03 per cent Mg) in 2 M NaOH solution containing 0.2 M zinc oxide and 700 ppm of polyaniline.

Design/methodology/approach

The approach is used to measure weight loss and polarization measurements.

Findings

Results obtained show that as the amount of polyaniline is increased, the self‐corrosion rate of Alloy 57S aluminium decreases appreciably. Additionally, the open circuit potential is more in the case of 700 ppm level of polyaniline (−1.630 V) compare to 600 ppm level of polyaniline (−1.587 V). From this paper, it is also observed that the anodic polarization is greater than the cathodic polarization, thereby indicating that the overall corrosion of Alloy 57S 2 M NaOH containing 0.2 M ZnO and 700 ppm of polyaniline is under anodic control.

Originality/value

The results of the study clearly reveal that the overall corrosion of Alloy 57S aluminium in 2 M NaOH containing 0.2 M ZnO and 700 ppm of polyaniline is under anodic control. Hence, the 57S grade aluminium can be used as a potential candidate (anode) in alkaline batteries.

Citation

Elango, A., Periasamy, V.M. and Paramasivam, M. (2009), "Study on polyaniline‐ZnO used as corrosion inhibitors of 57S aluminium in 2 M NaOH solution", Anti-Corrosion Methods and Materials, Vol. 56 No. 5, pp. 266-270. https://doi.org/10.1108/00035590910989561