Preparation, Corrosion and Cytocompatability In Vitro of Fluoride-Coated Mg-Zn-Zr Alloy

Abstract:

The present investigation was carried out to optimize the hydrogen fluoride (HF) aqueous solution treatment for an Mg-2.5Zn-0.5Zr alloy, in order to improve the corrosion resistance of the material for orthopaedic applications. An MgF₂ coating was formed on the surface of Mg-2.5Zn-0.5Zr alloy treated with HF solution. The effect of the HF concentration and processing time on the morphology and electrochemical performance of the MgF₂ coating was systematically studied. The results showed that the MgF₂ coating became thick gradually with the increase of the concentration of HF solution. However, the pinhole on the surface treated with 40% HF increased significantly. The coating thickness immersed in the same concentration of HF solution increased with immersion time, and cracks formed in the surface after four hours of immersion, resulting in a decrease in the corrosion potential. When the alloy was immersed in the HF solution with a concentration 20% at 37°C for 2h, a uniform and dense fluoride coating was formed, with a thickness of MgF₂ layer of about 0.5μm. The corrosion potential of the coated Mg alloy in simulated body fluid (SBF) was 0.28V higher than the uncoated one. In addition, the fluoride-coated showed a good biocompatibility.

• Periodical: Materials Science Forum (Volume 852)
• Pages: 1293-1299
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.852.1293
• Online since: April 2016
• Authors: Hao Ran Zheng, Jing Zhang, Chen You, Min Fang Chen
• Keywords: Corrosion Potential, Cytocompatability In Vitro, Mg-2.5Zn-0.5Zr Alloy, MgF₂ Coating

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