Microstructure and corrosion behavior of Ca/P coatings prepared on magnesium by plasma electrolytic oxidation
By Yang, Junjie; Lu, Xiaopeng; Blawert, Carsten; Di, Shichun; Zheludkevich, Mikhail L.
Published in Surface and Coatings Technology
NULL
2017
Abstract
Abstract In order to enhance the corrosion resistance and biocompatibility of Mg based implants, porous MgO-CaP coatings were fabricated on commercial Mg by adding hydroxyapatite (HAp) particles in alkaline phosphate solution for plasma electrolytic oxidation (PEO) treatment. The effects of particle concentration on the coating morphology and composition were investigated under constant current {PEO} processing. Electrochemical impedance spectroscopy (EIS) and immersion test conducted in simulated body fluid (SBF) environment were applied to evaluate the corrosion performance of the coatings. The results showed that most {HAp} particles were reactively incorporated into the {PEO} coatings and the coating microstructure was significantly modified with increasing concentration of HA, which resulted in higher corrosion resistance in return. The consecutive growth of impedance during 72 h immersion resulted from the precipitation and deposition of CaP compound and corrosion product into the pores sealing the defects of {PEO} coatings. Overall, a higher concentration (20 g/L) of {HAp} particles addition would bring out a denser and protective PEO-HAp coating.
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