A Study of PM Mg-HAP Composite: Corrosion and Microstructural Evaluation

Mg-HAP Composite produce by powder metallurgy (PM) methods is one new biomaterial usually applied as biomedical implant. However, the sensitive Mg metal to surrounding environment is giving the bad impact for this biomaterial because of the presence hydroxyapatite particle in Mg matrix. The aim of this work is to study the corrosion behavior and microstructural evaluation of composite biomaterial Mg with different percentage of Hyroxyapatite (HAP) (5, 10, 15 and 20 wt. %) produced by powder metallurgy (PM) method. The corrosion test was done using electrochemical methods and the microstructure after corrosion test was observed using optical microscope. Based on the results, the different percentages of HAP were influenced the corrosion rate of the Mg-HAP composite. The percentage of HAP content in Mg were greatly influences the corrosion behavior of the alloy. Sample Mg-20wt% HAP has the lowest corrosion rate which is 0.16mm per year, while sample Mg-15wt% HAP has the highest corrosion rate, 0.37 mm per year.