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Mechanism and kinetics of hydroxyapatite nucleation on biodegradable Mg alloy

The current metallic biomaterials such as stainless steels, Co-Cr alloys, and Ti-based alloys must be removed by a second surgical procedure after the tissue has healed sufficiently. Therefore, the development of biodegradable implants is one of the important areas in medical science. Magnesium and its alloys show many advantages over current metallic and non-metallic materials ; their mechanical properties are similar to natural bone, and they are biocompatible and biodegradable in the physiological solutions. The biocompatibility and bioactivity of Mg alloy can be improved by coating the alloy surface with hydroxyapatite (HAp), which has been recognized as being osteoconductive and able to enhance ossteointegration. The aim of this work was to study the kinetics of HAp nucleation/electrocrystallization on the Mg-alloys and to characterize the structural, morphological and barrier properties of the electrodeposited coating using SEM, FTIR, EDS, EIS and voltammetry methods.

biodegradable Mg alloy; hydroxyapatite

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