Inhibitor-doped sol-gel coatings for corrosion protection of magnesium alloy AZ31
authors Galio, AF; Lamaka, SV; Zheludkevich, ML; Dick, LFP; Muller, IL; Ferreira, MGS
nationality International
journal SURFACE & COATINGS TECHNOLOGY
author keywords Hybrid sol-gel; 8-Hydroxyquinoline; Corrosion inhibitor; Magnesium alloy; Impedance spectroscopy; SVET
keywords HYBRID COATINGS; THIN-FILM; MG ALLOY; PERFORMANCE; BEHAVIOR; STEEL
abstract This work presents new anticorrosive coatings for the AZ31 magnesium alloy, based on hybrid sol-gel films doped with a corrosion inhibitor. The sol-gel coatings were prepared by copolymerization of 3-glycidoxypropyltrimethoxysilane and zirconium (IV) tetrapropoxide. 8-Hydroxyquinoline (8-HQ) was chosen as a corrosion inhibitor to be incorporated into the sol-gel films at two different stages of synthesis, either before or after hydrolysis of the sol-gel precursors. The effectiveness of 8-HQ for corrosion suppression on AZ31 was verified by Scanning Vibrating Electrode Technique. Electrochemical Impedance Spectroscopy was used to monitor the evolution of the substrate/film systems in the course of immersion in 0.005 M NaCl. The morphology and the structure of the sol-gel films were characterized with SEM/EDS and TEM techniques. The sol-gel films exhibit good adhesion to the metal substrate and prevent the corrosive attack during 2 weeks under immersion test. Results showed that addition of inhibitor into the sol-gel films enhances the corrosion protection of the magnesium alloy and does not lead to deterioration of the barrier properties of the sol-gel matrix. (C) 2009 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 0257-8972
year published 2010
volume 204
issue 9-10
beginning page 1479
ending page 1486
digital object identifier (doi) 10.1016/j.surfcoat.2009.09.067
web of science category Materials Science, Coatings & Films; Physics, Applied
subject category Materials Science; Physics
unique article identifier WOS:000274495700023
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