期刊
MATERIALS TODAY COMMUNICATIONS
卷 26, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.mtcomm.2020.101750
关键词
Magnesium; Alloying; Brushite coating; Corrosion resistance
资金
- San-Ming Project of Medicine in Shenzhen [SZSM201612092]
- Natural Science Foundation of Guangdong Province [2019A1515011290]
- State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University [mmc-kf20-02]
- Shenzhen Double Chain Project for Innovation and Development Industry - Bureau of Industry and Information Technology of Shenzhen [201806081018272960]
The study found that brushite coated JDBM had the highest corrosion resistance, followed by uncoated JDBM, and then pure Mg. The main corrosion product of the Mg alloys in the cell culture medium was MgCO3 center dot 3H(2)O. The corrosion form of the JDBM alloys was uniform corrosion, while that of pure Mg was not uniform.
While magnesium (Mg) and its alloys have been regarded as encouraging orthopaedic implant materials, the high corrosion rate limits their application. This study determines how alloying and brushite coating affected the corrosion rate of Mg in vitro. The corrosion behaviours of pure Mg, Mg-Nd-Zn-Zr alloy (Jiao Da Bio-Mg, JDBM) and brushite coated JDBM in a simulated physiological environment were comparatively evaluated. The evaluation included the surface morphology, roughness, chemical composition, structure, phase composition and functional groups of the corrosion products with the corrosion rate, pH value, Mg2+ concentration and osmotic pressure of the immersion solution. The following corrosion resistance trends were found: brushite coated JDBM > uncoated JDBM > pure Mg. The main corrosion product of the Mg alloys in the cell culture medium was MgCO3 center dot 3H(2)O. Compared with the pure Mg, the corrosion form of the JDBM alloys was uniform corrosion. The results showed that the addition of the Nd, Zn and Zr elements and brushite coating effectively improved the corrosion resistance of metal Mg. In addition, the power law function formula Delta m = rho At-B was applied successfully to predict the mass loss of the JDBM alloy in an in vitro immersion test.
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