Advanced search

Acid‐dyes as corrosion inhibitors for mechanically pretreated aluminum

I. Tsangaraki‐Kaplanoglou (Department of Chemistry, University of Athens, Athens, Greece)
,
A. Kanta (Department of Chemistry, University of Athens, Athens, Greece)
S. Theohari (Department of Chemistry, University of Athens, Athens, Greece)
V. Ninni (Athens University of Economics and Business, Athens, Greece)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Publication date: 12 January 2010

Abstract

Purpose

–

The purpose of this paper is to provide acid‐dyes, known for the dyeing of porous aluminum oxide films, as inhibitors of the corrosion of aluminum in neutral chloride solutions.

Design/methodology/approach

–

Potentiodynamic polarization plots are recorded on mechanically pretreated aluminum using a three‐electrode cell containing 0.01 M NaCl solution with or without 0.025 mM of the acid‐dyes monosulfonic methyl orange (MO), disulfonic chromotrop RR (CH), disulfonic alphazurine A (AZ) and trisulfonic light green SF yellowish (LG). The X‐ray fluorescence technique is used in certain cases for the estimation of sulfur net content of the surface of the probes and thus of the concentration of the adsorbed dye.

Findings

–

The inhibition efficiency of acid dyes on corrosion of mechanically pretreated aluminum seems to be related more to the presence of a following quinonoid structure which probably contributes more to the formation of mono‐ or bi‐dentate compounds with the aluminum cations in the substrate than to the number of sulfonic groups in their molecule. Thus, the triphenylmethane dyes LG and, to a greater extent AZ, having this quinonoid structure means they are more efficient as corrosion inhibitors in near‐neutral chloride solution than the azo dyes MO and CH, that do not have it.

Practical implications

–

Selected acid‐dyes such as triphenylmethane sulfonic‐dyes, which have found wide application in the dyeing industry, seem to protect aluminum against the corrosive action of chlorides.

Originality/value

–

This paper is intended to be the nucleus for the electrochemical studies of the effectiveness of acid dyes as corrosion inhibitors for aluminum.

Keywords

Citation

Tsangaraki‐Kaplanoglou, I., Kanta, A., Theohari, S. and Ninni, V. (2010), "Acid‐dyes as corrosion inhibitors for mechanically pretreated aluminum", Anti-Corrosion Methods and Materials, Vol. 57 No. 1, pp. 6-12. https://doi.org/10.1108/00035591011009673

Download as .RIS

Publisher

:

Emerald Group Publishing Limited

Copyright © 2010, Emerald Group Publishing Limited

Please note you might not have access to this content

You may be able to access this content by login via Shibboleth, Open Athens or with your Emerald account.
To rent this content from Deepdyve, please click the button.
Rent from Deepdyve
If you would like to contact us about accessing this content, click the button and fill out the form.
Contact us

We’re listening — tell us what you think

Join us on our journey