In-vitro assessments of micro arc oxidized ceramic films on AZ31 magnesium implant: Degradation and cell-surface response

In this research, phosphate and silicate based ceramic films were synthesized via micro arc oxidation (MAO) method on the surface of the magnesium alloy. With the aim of orthopedic application of these coatings, corrosion behavior of them was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy in simulated body fluid (SBF) environment. The results indicated better corrosion resistance of the phosphate film compared to the silicate film. Moreover, based on immersion tests, less pH and weight changes were obtained for the phosphate coating. Osteosarchoma (G292) Cell response of the coated specimens showed better cell morphology on the surface of the phosphate film than silicate film after 6 and 24 h of culture. This was related to the more surface roughness and less degradation rate of the phosphate film compared with silicate coating.