Journal
PROGRESS IN ORGANIC COATINGS
Volume 72, Issue 3, Pages 387-393Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2011.05.011
Keywords
Surface treatment; Vanadia; EIS; Magnesium alloy; Self-healing; Automotive and Aircraft industries; Protective coatings; Linear polarization
Funding
- Alexander von Humboldt Research Award for Experienced Researchers
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Eco-friendly vanadia based chemical conversion coating was applied for improving the corrosion resistance of a newly developed magnesium AZ31 HP-O alloy. The effect of vanadia solution concentrations (10, 30 and 50g/l) and pH (neutral pH 7 and pH 9) on the corrosion protection performance of a magnesium substrate were investigated. EIS and linear polarization techniques were used to evaluate the electrochemical behavior in 3.5% NaCl. The results showed a marked increase in the localized corrosion resistance after applying vanadia surface treatment of 50 g/l due to self-healing effect. The optimum conditions to obtain protective coatings for AZ31 HP-O with a self-healing ability were determined. Changes in surface morphology, composition and microstructure of the conversion coatings were followed by SEM-EDS and macroscopic imaging techniques. (C) 2011 Elsevier B.V. All rights reserved.
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