J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (11): 2608-2617.DOI: 10.1016/j.jmst.2019.06.010
• Orginal Article • Previous Articles Next Articles
Gao Chengdea, Yao Menga, Shuai Cijunabc*(), Peng Shupingde, Deng Youwenf
Received:
2019-04-13
Revised:
2019-06-20
Accepted:
2019-06-28
Online:
2019-11-05
Published:
2019-10-21
Contact:
Shuai Cijun
About author:
1The authors equally contributed to this work.
Gao Chengde, Yao Meng, Shuai Cijun, Peng Shuping, Deng Youwen. Nano-SiC reinforced Zn biocomposites prepared via laser melting: Microstructure, mechanical properties and biodegradability[J]. J. Mater. Sci. Technol., 2019, 35(11): 2608-2617.
Composition | Icorr (μA/cm2) | Ecorr (V) | Corrosion rate (mm/year) |
---|---|---|---|
Pure Zn | 7.641 ± 0.924 | -1.005 ± 0.020 | 0.114 ± 0.038 |
Zn-0.5SiC | 8.612 ± 1.089 | -1.059 ± 0.025 | 0.148 ± 0.065 |
Zn-1SiC | 9.700 ± 0.507 | -1.107 ± 0.015* | 0.163 ± 0.035* |
Zn-2SiC | 10.38 ± 1.114* | -1.119 ± 0.027* | 0.198 ± 0.049* |
Zn-3SiC | 11.09 ± 0.870* | -1.170 ± 0.018* | 0.230 ± 0.027* |
Table 1 Electrochemical parameters fitted from polarization curves.
Composition | Icorr (μA/cm2) | Ecorr (V) | Corrosion rate (mm/year) |
---|---|---|---|
Pure Zn | 7.641 ± 0.924 | -1.005 ± 0.020 | 0.114 ± 0.038 |
Zn-0.5SiC | 8.612 ± 1.089 | -1.059 ± 0.025 | 0.148 ± 0.065 |
Zn-1SiC | 9.700 ± 0.507 | -1.107 ± 0.015* | 0.163 ± 0.035* |
Zn-2SiC | 10.38 ± 1.114* | -1.119 ± 0.027* | 0.198 ± 0.049* |
Zn-3SiC | 11.09 ± 0.870* | -1.170 ± 0.018* | 0.230 ± 0.027* |
Fig. 1. (a) SEM micrograph, (b) EDS analysis and (c) XRD pattern of nano-SiC powder; (d) SEM micrograph, (e) particle size distribution and (f) XRD pattern of Zn powder; (g) typical micrograph of Zn-2SiC mixed powder after 2 h mechanical milling; (h) corresponding EDS map of Si element distribution (red), (i) XRD pattern of the mixed powder.
Fig. 2. Optical microstructures of (a) Zn, (b) Zn-0.5SiC, (c) Zn-1SiC, (d) Zn-2SiC, (e) Zn-3SiC nanocomposites and (f) computed values of average grain size.
Fig. 3. SEM micrographs of Zn-xSiC nanocomposites fabricated via laser melting for (a) pure Zn, (b) Zn-0.5SiC, (c) Zn-1SiC, (d) Zn-2SiC, (e) Zn-3SiC; corresponding EDS analysis of (h) point A, (i) point B, and (f) line C; (g) EDS mapping of Si element distribution in Zn-2SiC (red).
Fig. 6. SEM morphologies of fracture surfaces of (a) pure Zn, (b) Zn-0.5SiC, (c) Zn-1SiC, (d) Zn-2SiC, (e) Zn-3SiC and (f) EDS analysis at point A. The typical fracture characteristics were indicated by white arrows.
Fig. 9. Surface morphologies and EDS map analysis of laser melting processed Zn-xSiC nanocomposites after immersion for 21 d: (a) pure Zn; (b) Zn-2SiC nanocomposite.
Fig. 10. (a) Fluorescence images of osteoblast-like MG-63 cells cultured in 100% extracts, and (b) CCK-8 results in 100% and 50% extracts of Zn-xSiC nanocomposites for different period with the data normalized to the control group.
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