▎ 摘　　要

In this study, the biocompatibility of graphene nanoplatelet (GNP) reinforced Mg composites towards hydroxyapatite mineralization is investigated in the simulated body fluids. The hydrogen evolution, weight loss, and electrochemical studies were conducted in modified simulated body fluid (m-SBF) for a short-term duration to evaluate the corrosion properties. The powder metallurgy route was used to fabricate the composites, and the X-ray diffraction study revealed insignificant oxide or carbide formation. The overall density of GNP reinforced material decreased by approximately 14% when compared with the unreinforced one. The corrosion studies in m-SBF for 24 h indicated that the GNP reinforced composite is susceptible to higher degradation. A lower Ca/P ratio was observed in the GNP reinforced composites compared to the pure magnesium due to the higher Mg(OH)(2) corrosive layer. The GNP reinforced composite displayed approximately 21% weight loss and showed a higher amount of hydrogen evolution. The corrosion properties of these composites were further established with electrochemical impedance spectroscopy measurements. The corresponding Bode impedance plots suggest that the addition of GNP in magnesium reduced the stability of Mg(OH)(2) and resulted in the enhanced dissolution of Cl- ions from m-SBF solution.