Article ID Journal Published Year Pages File Type
1689091 Vacuum 2016 4 Pages PDF
Abstract

•A novel nano-TiO2/HT duplex coating was deposited on Mg alloy.•Morphology and structure of nano-HT and nano-TiO2/HT coatings were evaluated.•Cytotoxicity of uncoated Mg alloy, nano-HT and TiO2/HT coatings were investigated.•The duplex coating significantly increased the corrosion resistance of Mg alloy.

In this study, nanostructured hardystonite (HT) and titania (TiO2)/hardystonite (HT) dual-layered coatings were deposited on biodegradable MgCaZn alloy via physical vapor deposition (PVD) combined with electrophoretic deposition (EPD). Although a single layer nano-HT coating can decrease the corrosion rate from 1.68 to 1.02 mm/year, due to the presence of porosities and microcracks, the nano-HT layer cannot sufficiently protect the Mg substrate. In contrast, the corrosion resistance of nano-HT coating is further improved by using nano-TiO2 underlayer since it was a smooth, very uniform and compact layer with higher contact angle (52.30°). In addition, the MTT assay showed the viability of MC3T3-E1 on the nano-HT and nano-TiO2/HT coatings. The results demonstrated that the two-step surface modification improved both corrosion resistance and the cytocompatibility of the Mg alloy, hence making it feasible for orthopedic applications.

Related Topics
Physical Sciences and Engineering Materials Science Surfaces, Coatings and Films
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