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Frontiers of Materials Science

ISSN 2095-025X

ISSN 2095-0268(Online)

CN 11-5985/TB

Postal Subscription Code 80-974

2018 Impact Factor: 1.701

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Front. Mater. Sci.    2015, Vol. 9 Issue (3) : 247-253    https://doi.org/10.1007/s11706-015-0299-3
RESEARCH ARTICLE
Effects of grain size on the corrosion resistance of pure magnesium by cooling rate-controlled solidification
Yichi LIU,Debao LIU(),Chen YOU,Minfang CHEN
School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
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Abstract

The aim of this study was to investigate the effect of grain size on the corrosion resistance of pure magnesium developed for biomedical applications. High-purity magnesium samples with different grain size were prepared by the cooling rate-controlled solidification. Electrochemical and immersion tests were employed to measure the corrosion resistance of pure magnesium with different grain size. The electrochemical polarization curves indicated that the corrosion susceptibility increased as the grain size decrease. However, the electrochemical impedance spectroscopy (EIS) and immersion tests indicated that the corrosion resistance of pure magnesium is improved as the grain size decreases. The improvement in the corrosion resistance is attributed to refine grain can produce more uniform and density film on the surface of sample.
Keywords pure magnesium      solidification cooling rate      grain size      corrosion resistance     
Corresponding Author(s): Debao LIU   
Online First Date: 01 June 2015    Issue Date: 23 July 2015
 Cite this article:   
Yichi LIU,Debao LIU,Chen YOU, et al. Effects of grain size on the corrosion resistance of pure magnesium by cooling rate-controlled solidification[J]. Front. Mater. Sci., 2015, 9(3): 247-253.
 URL:  
https://academic.hep.com.cn/foms/EN/10.1007/s11706-015-0299-3
https://academic.hep.com.cn/foms/EN/Y2015/V9/I3/247
Fig.1  Schematic illustration of the Cu wedge mould, showing the dimensions and typical cooling rate as a function of height of the mould.
Fig.2  The optical microstructures of pure magnesium with different cooling rates: (a) M1 sample; (b) M2 sample; (c) M3 sample; (d) M4 sample; (e) M5 sample.
Fig.3  Potentiodynamic polarization curves of pure magnesium with different grain size in SBF.
Fig.4  Nyquist spectra of the pure magnesium with different cooling rates in SBF solution.
Fig.5  Electrical circuit used to simulate the EIS results.
Sample Rs /(Ω·cm2) Cf /(F·cm2) Rt /(Ω·cm2) C /(Ω·cm2) R /(Ω·cm2)
M1 7.43 9.11×10-6 78.56 2.15×10-3 117.50
M2 12.89 8.99×10-6 87.23 1.01×10-3 43.45
M3 9.30 6.99×10-6 94.56 44.56×10-5 145.20
M4 8.95 4.94×10-6 98.48 1.36×10-5 153.8
M5 10.30 4.85×10-6 120.2 1.48×10-5 11.27
Tab.1  Fitting results of EIS plots of pure magnesium with different cooling rates in SBF solution
Fig.6  Weight loss of the pure magnesium with different grain size immersed in the SBF.
Fig.7  Surface morphology of pure magnesium with different grain size immersed in SBF for 12 and 24 h respectively: (a) M5 sample immersed in SBF for 12 h after removing corrosion product; (b) M1 sample immersed in SBF for 12 h after removing corrosion product; (c) M5 sample immersed in SBF for 12 h without removing corrosion product; (d) M1 sample immersed in SBF for 12 h without removing corrosion product.
DCPDdicalcium phosphate dehydrate
ECAPequal channel angular pressing
EISelectrochemical impedance spectroscopy
HAhydroxyapatite
SBFsimulated body fluid
SEMscanning electron microscopy
SPBsevere plasticity burnishing
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