Citrate gel conversion coating on AZ31 magnesium alloys
Journal
Corrosion Science
Journal Volume
87
Pages
288-296
Date Issued
2014
Author(s)
Chu, Y.R.
Abstract
A citrate gel conversion coating on AZ31 magnesium alloy is developed. The conversion solution is composed of glycerin and the citrate gel, which is isolated by adding ethanol into sodium citrate aqueous solution. Microstructure characterization shows that the coating is about 200. nm thick and free of cracks. This coating markedly reduces the corrosion current density and enhances the polarization resistance in potentiodynamic polarization and elevates the total impedance in electrochemical impedance measurement. Moreover, the addition of copper sulfate results in the formation of copper-rich clusters on the coating and an increase in the corrosion potential. © 2014 Elsevier Ltd.
SDGs
Type
journal article