Abstract
AbstractMagnesium represents a very attractive material for biodegradable orthopedic implants because of its capability to resolve the problem of stress shielding, osteocompatibility in addition to its biodegradability. Yet, pure Mg does not have adequate strength when exposed to body fluids as it starts degrading at a higher rate. The aim of this research is to study the effect of wire electric discharge machining on Mg-based alloy ZM21 to increase its effectiveness by surface grain refinement as a tool to limit the initial corrosion rate in body fluids (modulus of elasticity remains unchanged). Comparison of microstructural, mechanical, and in-vitro corrosion changes along with biocompatibility of the polished and wire EDM machined samples of ZM21 Magnesium alloy were performed in this study. The alloy experiences a change in grain size inthe recast layer formed on the machined surface which retards the initial degradation rate due to the occurrence of less number of high energy grain boundaries. Also ensures the production of corrosion resistive Mn2O3 and Mn3O4 compounds on the newly formed surface with MgO2 as the base.KeywordsZM21 Mg alloyBiodegradabilityOrthopedic implantWEDMCorrosion rateSBF
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