Abstract
Magnesium (Mg) and its alloys have the potential to revolutionize orthopaedic implants as a biodegradable metal implant; however, strategies are still needed to match its biodegradation rate with the healing rate of bone tissue. In this work, the in situ crystallization of calcium phosphates on pure Mg was developed as an easy and inexpensive method for controlling the corrosion rate of Mg. Coatings were characterized using glancing angle X-ray diffraction and field emission scanning electron microscopy. Subsequently, the coatings were immersed in a variety of simulated body fluids (Earl's balanced salt solution, minimal essential medium, minimal essential medium with serum albumin) to determine the coating's capacity to protect the underlying Mg substrate from corrosion. The results indicate that coatings could be produced with brushite or monetite–hydroxyapatite phases, both providing significant corrosion protection of Mg. In situ crystallization of calcium phosphate coatings shows promise as an easy and inexpensive method to control Mg corrosion in biomedical applications.
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