The chitosan coating and processing effect on the physiological corrosion behaviour of porous magnesium monoliths
By Tiyyagura, Hanuma Reddy; Rudolf, Rebeka; Gorgieva, Selestina; Fuchs-Godec, Regina; Boyapati, Venkatappa Rao; Mantravadi, Krishna Mohan; Kokol, Vanja
Published in Progress in Organic Coatings
NULL
2016
Abstract
Abstract The present study evaluates the corrosion resistance effect of chitosan coating onto porous magnesium (Mg) monoliths with porosities of 14-40 vol.%, prepared by sintering of Mg powder with {NH4HCO3} used as spacer particles. The dip-coated chitosan was found to interact with corrosion products (Mg(OH)2 and MgO) via hydrogen bonding, providing the physiological stability and the corrosion resistance, at the same time affecting the mineralization process towards amorphous apatite with a small contribution of crystalline hydroxyapatite(HAP). The electrochemical studies reveal that porosity increases, and that the coating process affects the corrosion resistance positively. However, the values for compression strength (17-72 MPa) and elastic modulus (12-26 MPa) of chitosan-coated monolith indicate its applicability as a supporting, rather than self-standing implantation material.
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