The Effect of n-TiO₂ on Corrosion and Biological Activity of Biocoatings Coated by Ultrasound Micro-Arc Oxidation on Pure Magnesium

Abstract:

In order to improve the corrosion resistance and bioactivity of magnesium alloy coated by ultrasound micro-arc oxidation (UMAO), different content of n-TiO₂ was added into silicate electrolyte. Electrochemical corrosion and simulated body fluid (SBF) soaking were conducted, and the surface morphology, phase structure and composition also were analyzed. The results indicated that Ecorr and Icorr of UMAO biocoatings with n-TiO₂ increased and decreased an order of magnitude with increase of n-TiO₂, respectively. The corrosion resistance of coatings with adding 4.8g/L n-TiO₂ into electrolyte was the best. After soaking in SBF, the samples increased loose weight firstly and then increased weight to form Mg₃Ca (CO₃)₄, Mg1₀Cl (OH)₁₈·5H₂O and Na₄Mg₂(PO₄) ·2H₂O new phases and Mg, MgO, MgSiO₃ were still exit, which showed that good bioactivity of the UMAO coatings with n-TiO₂.

• Periodical: Key Engineering Materials (Volume 633)
• Pages: 418-421
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.633.418
• Online since: November 2014
• Authors: Chen Ma*, Yan Gao, Li Jie Qu, Mu Qin Li, Jin Long Yue, Yu Qi Yuan, Jing Yan Wang
• Keywords: Corrosion Resistance, Nano-TiO₂, Pure Magnesium, Ultrasound Micro-Arc Oxidation

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