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Corrosion protective properties of coatings doped with inhibitors

Mansoureh Parsa (Department of Chemistry, Shahid Bahonar University of Kerman, Kerman, Iran)
Seyed Mohammad Ali Hosseini (Department of Chemistry, Shahid Bahonar University of Kerman, Kerman, Iran and Department of New Materials, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran)
Zahra Hassani (Department of New Materials, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran)
Effat Jamalizadeh (Department of Chemistry, Shahid Bahonar University of Kerman, Kerman, Iran)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 28 October 2014

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Abstract

Purpose

The purpose of this paper was to study the corrosion resistance of water-based sol-gel coatings containing titania nanoparticles doped with organic inhibitors for corrosion protection of AA2024 alloy.

Design/methodology/approach

The coatings were obtained using tetraethylorthosilicate, 3-glycidoxypropyltrimethoxysilane, titanium (IV) tetrapropoxide and poly(ethylene imine) polymer as cross-linking agents. As corrosions inhibitors, 2-mercaptobenzoxazole and salicylaldoxime were incorporated into the sol-gel for the improvement of the corrosion resistance. The corrosion protection performance of coatings was studied using the potentiodynamic scan and the electrochemical impedance spectroscopy (EIS) methods. Atomic force microscopy was used to investigate surface morphology of the coatings.

Findings

The results indicated that doping the sol-gel coatings with inhibitors leads to improvement of the corrosion protection. The comparison of doped coatings confirmed that corrosion protection performance of the sol-gel coatings doped with 2-mercaptobenzoxazole was better than for the sol-gel coatings doped with salicylaldoxime. Also the EIS results verified self-healing effects for the sol-gel coatings doped with 2-mercaptobenzoxazole.

Originality/value

This paper indicates 2-mercaptobenzoxazole and salicylaldoxime can be added as corrosion inhibitors to sol-gel coatings to improve their corrosion protective properties for AA2024 alloy.

Keywords

Citation

Parsa, M., Mohammad Ali Hosseini, S., Hassani, Z. and Jamalizadeh, E. (2014), "Corrosion protective properties of coatings doped with inhibitors", Anti-Corrosion Methods and Materials, Vol. 61 No. 6, pp. 416-422. https://doi.org/10.1108/ACMM-07-2013-1281

Publisher

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Emerald Group Publishing Limited

Copyright © 2014, Emerald Group Publishing Limited