Abstract
Magnesium orthopedic implants have been categorized to be one of the potential metallic biomaterial candidates due to their better biocompatibility nature, excellent biodegradability feature and its comparable mechanical properties with natural human bone. But, magnesium scaffolds experience unstable biocorrosion under physiological solutions, thus hindering their utility in implant applications. Moreover, conventional and typical metallic implants are non-porous in nature and also often result in stress shielding. To this end, this research has examined the outcome of adding metallic alloying elements (Ca, Zn and Fe) into the Mg metal matrix, while varying porosity was produced by incorporating carbamide. The corrosion behavior of the produced samples post-immersion in Hank’s solution was observed. This investigation established that the corrosion rates of the alloyed samples could be controlled by tuning the sample compositions. The corroded samples were also observed under optical microscopy, which revealed the protective layer, which could have retarded the corrosion of the immersed samples. X-ray micro-computed tomography results confirm the gradient porosity with interconnected pores in the produced samples, a vital feature for an implant. Therefore, this investigation confirms that the behavior of biocorrosion could be tailored by fabricating customized Mg-alloy-based bone implants.
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