Influence of Alumina Particles Addition in an Alkaline Silicate-Aluminate Electrolyte on Corrosion Properties of Plasma Electrolytic Oxidation Coatings on AZ31B Mg Alloy
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This study investigates the electrochemical corrosion resistance of plasma electrolytic oxidation (PEO) coatings onAZ31B Mg alloy, focusing on the influence of Al2O3 particles addition into an alkaline silicate-aluminate electrolyte. PEO coatingswere fabricated with varying Al2O3 concentrations from 0 to 10 g/L in the electrolyte and analyzed for thickness, surface morphology,and porosity. Electrochemical corrosion behavior was assessed via potentiodynamic polarization and electrochemical impedancespectroscopy (EIS). Although the thickness of PEO coatings increased with increasing Al2O3 concentration in the electrolyte, optimalcorrosion resistance was achieved at 4 g/L of Al2O3, originating in the lowest porosity. This concentration yielded the highest corrosionpotential and lowest corrosion current density, resulting in highest polarization resistance. EIS results corroborated these findings,confirming superior corrosion protection by PEO coating at the Al2O3 concentration of 4 g/L owing to a denser, more protectiveoxide layer.
Abstract
This study investigates the electrochemical corrosion resistance of plasma electrolytic oxidation (PEO) coatings onAZ31B Mg alloy, focusing on the influence of Al2O3 particles addition into an alkaline silicate-aluminate electrolyte. PEO coatingswere fabricated with varying Al2O3 concentrations from 0 to 10 g/L in the electrolyte and analyzed for thickness, surface morphology,and porosity. Electrochemical corrosion behavior was assessed via potentiodynamic polarization and electrochemical impedancespectroscopy (EIS). Although the thickness of PEO coatings increased with increasing Al2O3 concentration in the electrolyte, optimalcorrosion resistance was achieved at 4 g/L of Al2O3, originating in the lowest porosity. This concentration yielded the highest corrosionpotential and lowest corrosion current density, resulting in highest polarization resistance. EIS results corroborated these findings,confirming superior corrosion protection by PEO coating at the Al2O3 concentration of 4 g/L owing to a denser, more protectiveoxide layer.