Abstract
AZ91D magnesium alloys have been referred to as a revolutionary material for biomedical applications, particularly in orthopaedics as a bone implant material. This is attributable to the good strength and strong biocompatibility of magnesium and its alloys with bone tissue relative to other metallic alloys. The rapid degradation of pure magnesium has, sadly, reduced its therapeutic use. As a consequence, the efficacy of hydroxyapatite (HA) and graphene oxide (GO) in corrosion resistance has demonstrated tremendous potential to improve its defensive properties in order to address this vulnerability. AZ91D alloy has been coated with HA/GO by micro-arc oxidation (MAO) at a specific concentration and voltage, with varying treatment times. Surface roughness, elemental composition analysis and surface morphology analysis were tested at different treatment time. The sample enduring 15 min of treatment time was found to have the greatest resistance to corrosion due to its surface morphology and the importance of surface roughness was within the range of recommended roughness for a biomedical implant.
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