Diseño de recubrimientos multicapa barrera-biomimético base TEOS-GPTMS sobre la aleación de magnesio Elektron 21 de potencial aplicación en la fabricación de implantes ortopédicos

Abstract

In the present work, barrier-biomimetic multilayer coatings were synthesized via sol-gel on the commercial Elektron 21 magnesium alloy, with potential interest in the fabrication of orthopaedic temporal implants. Sol-gel synthesis was carried out from a mixture of inorganic and organic precursors, TEOS and GPTMS. Two different sols were prepared: sols employed for the design of barrier coatings (named GT) which function were to protect the magnesium alloy against corrosion; and sols containing additionally calcium nitrate (named GTCa), in different concentrations, for the design of the biomimetic coatings, which were deposited over the GT coating. The results confirmed that the GT coatings enhanced the corrosion resistance of the base alloy in Hank solution, reducing the corrosion current density in about two orders of magnitude. Further, the presence of Ca(II) in GTCa coatings promoted the formation of discontinuous film of hydroxyapatite on the surface, indicating that those coatings exhibit bioactive properties. Copyright: