Assessment of a one-step intelligent self-healing vanadia protective coatings for magnesium alloys in corrosive media

作者：Hamdy Abdel Salam^*; Doench I; Moehwald H

来源：Electrochimica Acta, 2011, 56(5): 2493-2502.

DOI：10.1016/j.electacta.2010.11.103

• Chemical conversion coatings
• Vanadia
• EIS
• Magnesium alloy, AZ31 HP-O
• Surface treatment
• NaCl
• Protective films
• AFM

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 on the corrosion protection performance of magnesium substrate were investigated. EIS and cyclic voltammetry techniques were used to evaluate the electrochemical behavior in 3.5% NaCl. Results showed a marked increase in the localized corrosion resistance after applying vanadia surface treatment of 50 g/l as measured by EIS and polarization techniques. The optimum conditions to obtain protective coatings for AZ31 HP-O were determined. The surface morphology, composition and microstructure of conversion coatings were followed by AFM, SEM-EDS and macroscopic imaging techniques.

• 出版日期2011-2-1