resumo
The present work reports on PEO coatings which can be potentially used for degradation control of Mg-based implant materials. Three coatings were developed on Mg-0.8wt%Ca alloy: two in an electrolyte with fluoride species using different treatment times and one in a fluoride-free electrolyte. Uncoated and coated materials were examined in terms of structure and morphology using TEM, SEM and XRD. The corrosion investigations on fluoride containing samples were performed using DC potentiodynamic curves, EIS and hydrogen evolution measurements. Both PEO coatings improved the corrosion resistance compared to the bulk material and the best behaviour was found for the thinnest PEO coating (PE01-F). The amount of released F ions was also measured with the aim of underpinning the effect of coatings and presence of fluorides species on the cell response. The bulk material and the coated alloy were studied using live/dead cell test, with the best results obtained for thinner fluoride containing coatings. (C) 2017 Elsevier B.V. All rights reserved.
palavras-chave
AZ91D MAGNESIUM ALLOY; CORROSION BEHAVIOR; PEO COATINGS; BIOMEDICAL APPLICATIONS; BIODEGRADABLE IMPLANTS; MECHANICAL-PROPERTIES; HEAT-TREATMENT; MICROSTRUCTURE; HYDROXYAPATITE; ADJUSTMENT
categoria
Materials Science; Physics
autores
Mohedano, M; Luthringer, BJC; Mingo, B; Feyerabend, F; Arrabal, R; Sanchez-Egido, PJ; Blawert, C; Willumeit-Romer, R; Zheludkevich, ML; Matykina, E
nossos autores
Mikhail Zheludkevich
Investigador Principal ConvidadoGrupos
Projectos
MULTI-functional metallic SURFaces via active Layered Double Hydroxide treatments (MULTISURF)
agradecimentos
This work was partially supported by MULTISURF (Marie Sklodowska-Curie grant agreement No 645676) European project and Multimat Challenge Programme (S2013/MIT-2862-CM via Regional Government of Madrid and EU Structural Funds). MM is grateful to the Alexander von Humboldt Foundation (7000273793) (Germany) and to the MICINN (Spain) for financial support via Juan de la Cierva Programme (IJCI-2014-19117) and Proyecto Retos Jovenes Investigadores (MAT2015-73355-JIN). The technical support of Mr. U. Burmester and Mr. V. Heitmann is gratefully acknowledged. EM is grateful to the Ramon y Cajal Programme (MICINN, Spain, RYC-2010-06749).