Synthesis of Magnesium Oxide Layer on the Surface of Magnesium by the Anodizing Process for Biodegradable Implants
Abstract
Magnesium (Mg) as a biodegradable implant has revolutionized medical field applications, particularly in bone implants and stents. The surface of magnesium alloys used in biomedical applications was treated in this work by “anodizing in 3.5 mol/L sulfuric acids" at room temperature with (8.5V). The magnesium oxide (MgO) layer thus formed was characterized with by scanning electron microscopy (SEM), X-ray diffraction (XRD) and atomic forced spectroscopy (AFM). The morphology and topographic structures for the MgO layer formed on the Mg surface by SEM and AFM techniques show the oxide layer is porous in nature; this porous oxide layer will enable the bone tissue to infiltrate them, healing the bone tissue pretty earlier. The corrosion behavior of the Mg alloy was examined by means of electrochemical techniques and potential polarization curves at temperatures between 298 and 328 K in saline conditions. The alloy was increased corrosion protection with increasing temperatures from 99.93 to 99.97%, indicate the MgO layer formed on the Mg surface was not affected by temperature. The pre-exponential factor “kinetic parameters” and activation energy “kinetic parameters” were discussed calculated. Thermodynamic activation values S and H were also estimated.Keywords:
Anodizing, Biomedical, Bone implant, Corrosion, Magnesium alloyReferences
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