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Open AccessArticle

Mg-MOF-74/MgF2 Composite Coating for Improving the Properties of Magnesium Alloy Implants: Hydrophilicity and Corrosion Resistance

1
School of Mechanical & Electrical Engineering, Henan University of Technology, Zhengzhou 450001, China
2
School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(3), 396; https://doi.org/10.3390/ma11030396
Received: 9 February 2018 / Revised: 24 February 2018 / Accepted: 6 March 2018 / Published: 7 March 2018
(This article belongs to the Section Porous Materials)
Surface modification on Mg alloys is highly promising for their application in the field of bone repair. In this study, a new metal–organic framework/MgF2 (Mg-MOF-74/MgF2) composite coating was prepared on the surface of AZ31B Mg alloy via pre-treatment of hydrofluoric acid and in situ hydrothermal synthesis methods. The surface topography of the composite coating is compact and homogeneous, and Mg-MOF-74 has good crystallinity. The corrosion resistance of this composite coating was investigated through Tafel polarization test and immersion test in simulated body fluid at 37 °C. It was found that Mg-MOF-74/MgF2 composite coating significantly slowed down the corrosion rate of Mg alloy. Additionally, Mg-MOF-74/MgF2 composite coating expresses super-hydrophilicity with the water contact angle of nearly 0°. In conclusion, on the basis of MgF2 anticorrosive coating, the introduction of Mg-MOF-74 further improves the biological property of Mg alloys. At last, we propose that the hydrophilicity of the composite coating is mainly owing to the large number of hydroxyl groups, the high specific surface area of Mg-MOF-74, and the rough coating produced by Mg-MOF-74 particles. Hence, Mg-MOF-74 has a great advantage in enhancing the hydrophilicity of Mg alloy surface. View Full-Text
Keywords: magnesium alloys; corrosion resistance; hydrophilicity; metal organic framework; composite coating magnesium alloys; corrosion resistance; hydrophilicity; metal organic framework; composite coating
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MDPI and ACS Style

Liu, W.; Yan, Z.; Ma, X.; Geng, T.; Wu, H.; Li, Z. Mg-MOF-74/MgF2 Composite Coating for Improving the Properties of Magnesium Alloy Implants: Hydrophilicity and Corrosion Resistance. Materials 2018, 11, 396.

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