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Metals 2017, 7(9), 358; doi:10.3390/met7090358

In Vitro Corrosion Properties of Mg Matrix In Situ Composites Fabricated by Spark Plasma Sintering

1
Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, Tokyo 152-8550, Japan
2
Division of Engineering and Applied Sciences, California Institute of Technology, Pasadena, CA 91125, USA
3
School of Materials Science and Engineering, Hanoi University of Science and Technology, Hanoi 100000, Vietnam
4
Corrosion Property Group, Research Center for Structural Materials, National Institute for Materials Science, Tsukuba 305-0047, Japan
*
Author to whom correspondence should be addressed.
Received: 8 August 2017 / Revised: 4 September 2017 / Accepted: 7 September 2017 / Published: 9 September 2017
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Abstract

Mg matrix in situ composites were fabricated from Mg and ZnO powder by a spark plasma sintering method. The composition and microstructure of the sintered samples were characterized. Corrosion properties of fabricated composites were evaluated by immersion and by electrochemical tests using Hanks’ solution. The results showed that the formation of in situ products improved significantly the corrosion resistance of the fabricated composites compared with pure Mg; Mg-10 wt % ZnO composites especially exhibited the lowest corrosion rate. In addition, an energy-dispersive X-ray (EDX) analysis showed that calcium phosphate formed as a corrosion product on the surface of Mg-10 wt % ZnO composites, while Mg(OH)2 appeared as a corrosion product on the surface of Mg-20 wt % ZnO composite. The findings suggested Mg-10 wt % ZnO composite as a potential candidate for temporary implant application. View Full-Text
Keywords: Mg matrix composites; corrosion property; spark plasma sintering; corrosion rate Mg matrix composites; corrosion property; spark plasma sintering; corrosion rate
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Cao, N.Q.; Pham, D.N.; Kai, N.; Dinh, H.V.; Hiromoto, S.; Kobayashi, E. In Vitro Corrosion Properties of Mg Matrix In Situ Composites Fabricated by Spark Plasma Sintering. Metals 2017, 7, 358.

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