Evaluation of Corrosion Protection of Sol-Gel Coatings on AZ31B Magnesium Alloy
authors Galio, AF; Lamaka, SV; Zheludkevich, ML; Dick, LF; Muller, IL; Ferreira, MGS
editors Marques, AT; Silva, AF; Baptista, APM; Sa, C; Alves, FJLA; Malheiros, LF; Vieira, M
nationality International
author keywords magnesium alloy; sol-gel; electrochemical impedance spectroscopy; corrosion
abstract Magnesium is one of the lightest metals and magnesium alloys have good strength to weight ratio making than very attractive for many particular applications [l]. The main drawback of magnesium alloys is their high,corrosion susceptibility. Improving the corrosion protection by deposition of thin hybrid films can expand the areas of applications of relatively cheap magnesium alloys. This work aims at investigation of new anticorrosion coating systems for magnesium alloy AZ31B using hybrid sol-gel films. The sot-gels were prepared by copolymerization of 3-glycidoxypropyltrimethoxysilane (GPTMS), titanium alcoxides and special additives which provide corrosion protection of magnesium alloy. Different compositions of sot-gel systems show enhanced long-term corrosion protection of magnesium alloy. The sot-gel coatings exhibit excellent adhesion to the substrate and protect against the corrosion attack. Corrosion behavior of AZ31B substrates pre-treated with sot-gel derived hybrid coatings was tested by Electrochemical Impedance Spectroscopy (IBIS). The morphology and the structure of sol-gel films under study were characterized with SEM/EDS techniques.
issn 0255-5476
year published 2008
volume 587-588
beginning page 390
ending page +
web of science category Engineering, Multidisciplinary; Materials Science, Multidisciplinary
subject category Engineering; Materials Science
unique article identifier WOS:000259898200078