Smart self-healing anti-corrosion vanadia coating for magnesium alloys |
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Authors: | Abdel Salam Hamdy,I. DoenchH. Mö hwald |
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Affiliation: | a Central Metallurgical Research and Development Institute, CMRDI, P.O. Box: 87, Helwan, Cairo, Egypt b Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam, Germany |
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Abstract: | 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 50 g/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. |
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Keywords: | Surface treatment Vanadia EIS Magnesium alloy Self-healing Automotive and Aircraft industries Protective coatings Linear polarization |
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