Silica-alumina based sol-gel coating containing cerium oxide nanofibers as a potent alternative to conversion coating for AA2024 alloy

Lakshmi, RV and Sampath, S and Aruna, ST (2021) Silica-alumina based sol-gel coating containing cerium oxide nanofibers as a potent alternative to conversion coating for AA2024 alloy. In: Surface and Coatings Technology, 411 .

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Abstract

The current work demonstrates a study on the improved corrosion protection efficiency of a defect-free sol-gel hybrid coating consisting of cerium oxide nanofibers vis-à -vis sol-gel coating containing commercial nanosize ceria particles as corrosion inhibitors. The less researched organically modified silica-alumina (Si-Al) hybrid sol-gel coating containing cerium oxide nanofibers and commercial ceria are synthesized from 3-glycidoxypropyltrimethoxysilane and aluminum-tri-sec-butoxide. The sol-gel matrix containing cerium oxide nanofibers exhibiting Ce mainly in +3 oxidation state exhibits improved corrosion resistance as corroborated by electrochemical impedance spectroscopy. The corrosion property of this sol-gel coating commensurates well with the conventional chromate conversion coating (CCC) as evidenced by the neutral salt spray test. The developed coating exhibits good compatibility with the top primer layer and thus ascertains that the developed Si-Al based sol-gel coating containing cerium oxide nanofibers is a potent alternative to conventional CCC. © 2021 Elsevier B.V.

Item Type:	Journal Article
Publication:	Surface and Coatings Technology
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to Elsevier B.V.
Keywords:	Alumina; Aluminum coatings; Aluminum oxide; Atmospheric corrosion; Cerium oxide; Chromate coatings; Chromates; Corrosion resistance; Corrosive effects; Electrochemical corrosion; Electrochemical impedance spectroscopy; Nanofibers; Seawater corrosion; Silica; Silicon; Sol-gel process; Sol-gels, 3-Glycidoxypropyltrimethoxysilane; Aluminum tri-sec-butoxide; Chromate conversion coatings; Hybrid sol-gel coatings; Neutral salt spray test; Organically modified silica; Protection efficiency; Sol-gel hybrid coatings, Corrosion resistant coatings
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	23 Mar 2021 10:03
Last Modified:	23 Mar 2021 10:03
URI:	http://eprints.iisc.ac.in/id/eprint/68397

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