Electrochemical Corrosion Properties of Plasma Electrolytic Oxidation Coatings on AZ31 Mg Alloy in Sodium Silicate-based Electrolyte Containing NaAlO2
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Plasma electrolytic oxidation (PEO) of AZ31B Mg alloys was performed in NaAlO2 additive-containing Na2SiO3-based electrolytes,and the electrochemical corrosion properties of the PEO coatings were investigated. The concentration of NaAlO2 additive was variedfrom 2 to 6 g/L. As the NaAlO2 additive concentration increased, the Al content increased, whereas the Si content decreased in the PEOcoatings. The surface porosity of the PEO coatings was minimized at a NaAlO2 content of 4 g/L. Potentiodynamic and electrochemicalimpedance spectroscopy tests in Ringer’s solution indicated that the corrosion resistance of the AZ31B Mg alloy was significantlyimproved by the addition of 4 g/L NaAlO2 to Na2SiO3-based electrolytes.
Abstract
Plasma electrolytic oxidation (PEO) of AZ31B Mg alloys was performed in NaAlO2 additive-containing Na2SiO3-based electrolytes,and the electrochemical corrosion properties of the PEO coatings were investigated. The concentration of NaAlO2 additive was variedfrom 2 to 6 g/L. As the NaAlO2 additive concentration increased, the Al content increased, whereas the Si content decreased in the PEOcoatings. The surface porosity of the PEO coatings was minimized at a NaAlO2 content of 4 g/L. Potentiodynamic and electrochemicalimpedance spectroscopy tests in Ringer’s solution indicated that the corrosion resistance of the AZ31B Mg alloy was significantlyimproved by the addition of 4 g/L NaAlO2 to Na2SiO3-based electrolytes.
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