Novel hybrid sol-gel coatings for corrosion protection of AZ31B magnesium alloy
authors Lamaka, SV; Montemor, MF; Galio, AF; Zheludkevich, ML; Trindade, C; Dick, LF; Ferreira, MGS
nationality International
journal ELECTROCHIMICA ACTA
author keywords sol-gel coating; magnesium alloy; AZ31 B; corrosion; EIS
keywords ELECTROCHEMICAL TEST METHODS; EVALUATING ORGANIC COATINGS; TEST PARAMETER MEASUREMENTS; IMPEDANCE SPECTROSCOPY; GALVANIZED STEEL; ALUMINUM-ALLOYS; METALS; PRETREATMENTS; UPDATE; NANOCONTAINERS
abstract This work aims to develop and study new anticorrosion films for AZ31B magnesium alloy based on the sol-gel coating approach. Hybrid organic-inorganic sols were synthesized by copolymerization of epoxy-siloxane and titanium or zirconium alkoxides. Tris(trimethylsilyl) phosphate was also used as additive to confer additional corrosion protection to magnesium-based alloy. A sol-gel coating, about 5-mu m thick, shows good adhesion to the metal substrate and prevents corrosion attack in 0.005 M NaCl Solution for 2 weeks. The sol-gel coating system doped with tris(trimethylsilyl)-phosphate revealed improved corrosion protection of the magnesium alloy due to formation of hydrolytically stable Mg-O-P chemical bonds. The structure and the thickness of the solgel film were characterized by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The corrosion behaviour of AZ31B substrates pre-treated with the sol-gel derived hybrid coatings was tested by electrochemical impedance spectroscopy (EIS). The chemical composition of the silylphosphate-containing sol-gel film at different depths was investigated by X-ray photoelectron spectroscopy (XPS) with depth profiling. (C) 2008 Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0013-4686
year published 2008
volume 53
issue 14
beginning page 4773
ending page 4783
digital object identifier (doi) 10.1016/j.electacta.2008.02.015
web of science category Electrochemistry
subject category Electrochemistry
unique article identifier WOS:000255604900024
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