Fabrication, degradation behavior and cytotoxicity of nanostructured hardystonite and titania/hardystonite coatings on Mg alloys

• Main Authors: Bakhsheshi-Rad, H. R., Hamzah, E., Kasiri-Asgarani, M., Jabbarzare, S., Daroonparvar, M., Najafinezhad, A.
• Format: Article
• Published: Elsevier Ltd 2016
• Subjects: HD28 Management. Industrial Management
• Online Access: http://eprints.utm.my/id/eprint/72384/; https://www.scopus.com/inward/record.uri?eid=2-s2.0-84963627737&doi=10.1016%2fj.vacuum.2016.03.021&partnerID=40&md5=087f3faa11d15e6cfddc59278b19423b

In this study, nanostructured hardystonite (HT) and titania (TiO2)/hardystonite (HT) dual-layered coatings were deposited on biodegradable Mg-Ca-Zn 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.