Fabrication and corrosion behavior of HA/Mg-Zn biocomposites |
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| Authors: | De-Bao Liu Ming-Fang Chen and Xin-Yu Ye |
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| Affiliation: | (1) Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China;(2) Graduate School of the Chinese Academy of Sciences, Beijing, 100049, China; |
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| Abstract: | The thermal-treated hydroxyapatite (HA) particles, Mg and Zn powders were used to prepare the HA/Mg-Zn composites with different
HA contents by means of powder metallurgy technology. The microstructures, formation phases, and corrosion behaviors in simulated
body fluid (SBF) were studied in comparison with pure magnesium and HA/Mg composites fabricated by the same preparation technology.
As a result, no evident reaction happened between HA particles and Mg matrix during sintering process, and Zn atoms diffused
into Mg matrix to form a single phase Mg-Zn alloy matrix. The addition of HA particles changed the corrosion mechanism of
Mg matrix. During the corrosion process, HA particles would adsorb PO43? and Ca2+ ions efficiently and induce the deposition of Ca-P compounds on the surface of composites. HA could improve the corrosion
resistance of magnesium matrix composites in SBF and restrain the increase of pH of SBF. Furthermore, the addition of Zn was
favorable to improve the corrosion resistance of HA/Mg composites due to the densification of composites and the formation
of Mg-Zn alloy matrix. |
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