J. Mater. Sci. Technol. ›› 2016, Vol. 32 ›› Issue (9): 845-857.DOI: 10.1016/j.jmst.2016.06.021
Special Issue: 2016腐蚀与防护专辑
• Orginal Article • Previous Articles Next Articles
Received:
2015-07-06
Accepted:
2015-10-31
Online:
2016-09-20
Published:
2016-11-02
Contact:
Xi Tingfei
Liu Jing,Xi Tingfei. Enhanced Anti-corrosion Ability and Biocompatibility of PLGA Coatings on MgZnYNd Alloy by BTSE-APTES Pre-treatment for Cardiovascular Stent[J]. J. Mater. Sci. Technol., 2016, 32(9): 845-857.
Fig. 2. Surface and cross-section morphology and composition analysis. (a) Surface images of MgZnYNd-B, MgZnYNd-B-A, MgZnYNd-B-A-P, MgZnYNd-P and cross-section images of MgZnYNd-P, MgZnYNd-B-A-P; (b) FT-IR spectrum with characteristic absorption bands; (c) surface amine concentration of MgZnYNd-B-A. Scale bar is 20?μm for surface images.
Fig. 3. (a) Whole XPS spectra of MgZnYNd-B, MgZnYNd-B-A and MgZnYNd-B-A-P; (b) the fitted O 1s and Si 2p XPS spectra of cross-linked silane films on MgZnYNd-B, MgZnYNd-B-A and MgZnYNd-B-A-P, respectively.
Sample | O 1s (%) | C 1s (%) | Si 2p (%) | Y 3p (%) | N 1s (%) |
---|---|---|---|---|---|
MgZnYNd-B | 38.36 | 33.77 | 26.07 | 1.86 | — |
MgZnYNd-B-A | 29.37 | 41.34 | 23.23 | 1.4 | 4.66 |
MgZnYNd-B-A-P | 36.31 | 61.56 | 2.13 | — | — |
Table 1 Characterization of polysiloxane coatings by their elemental composition calculated from XPS intensities and denoted as atomic percentage (at.%)
Sample | O 1s (%) | C 1s (%) | Si 2p (%) | Y 3p (%) | N 1s (%) |
---|---|---|---|---|---|
MgZnYNd-B | 38.36 | 33.77 | 26.07 | 1.86 | — |
MgZnYNd-B-A | 29.37 | 41.34 | 23.23 | 1.4 | 4.66 |
MgZnYNd-B-A-P | 36.31 | 61.56 | 2.13 | — | — |
Fig. 5. (a) Steps for the nano-scratch resistance test; (b) lateral forces changed with time were recorded for MgZnYNd-P, MgZnYNd-A-P and MgZnYNd-B-A-P samples during the tests, green dots signifies the critical point of the lateral forces.
Fig. 6. Electrochemical measurement for bare MgZnYNd, MgZnYNd-P, MgZnYNd-A-P and MgZnYNd-B-A-P samples: (a) open circuit potential; (b) potentiodynamic polarization plots; (c) Nyquist plots.
Sample | OCP (V) | Ecorr (V) | Icorr (μA cm-2) | Zre (Ω) |
---|---|---|---|---|
MgZnYNd | -1.556 | -1.396 | 31.910 | 1860 |
MgZnYNd -P | -1.568 | -1.475 | 13.935 | 3410 |
MgZnYNd -A-P | -1.550 | -1.148 | 10.482 | 27800 |
MgZnYNd -B-A-P | -0.495 | -0.405 | 7.148 | 118750 |
Table 2 Open circuit potential (OCP), corrosion potential (Ecorr), and current density (Icorr) values for MgZnYNd samples using different treatment methods
Sample | OCP (V) | Ecorr (V) | Icorr (μA cm-2) | Zre (Ω) |
---|---|---|---|---|
MgZnYNd | -1.556 | -1.396 | 31.910 | 1860 |
MgZnYNd -P | -1.568 | -1.475 | 13.935 | 3410 |
MgZnYNd -A-P | -1.550 | -1.148 | 10.482 | 27800 |
MgZnYNd -B-A-P | -0.495 | -0.405 | 7.148 | 118750 |
Fig. 7. (a) SEM images of the MgZnYNd-P, MgZnYNd-B-A-P after immersing in Hank's solution for 15 and 30 days. (b) The EDS spectra after 30th day immersion show Mg, Ca and P peaks. Scale bar is 20?μm and 200?μm, respectively.
Fig. 8. (a,b) Mg2+ concentrations and pH values of the medium for bare MgZnYNd, MgZnYNd-P, MgZnYNd-A-P and MgZnYNd-B-A-P samples at different time points (15th day and 30th day). Hank's solution without sample worked as blank control. Data were statistically analyzed using a one-way ANOVA, *** Represents p?<?0.001, ** Represents p?<?0.01.
Fig. 9. Human umbilical vein endothelial (EA. hy926) and rodent vascular smooth muscle cell (VSMC) morphology imagined at 24?h ((a)-1, (b)-1) and 48?h ((a)-2, (b)-2) after seeding through actin-nucleus co-staining on bare MgZnYNd, MgZnYNd-P, MgZnYNd-A-P and MgZnYNd-B-A-P samples, tissue culture plate acted as blank control. Scale bar is 200?μm and 10?μm, respectively.
Fig. 10. Cell viabilities cultured on bare MgZnYNd, MgZnYNd-P, MgZnYNd-A-P and MgZnYNd-B-A-P samples by the CCK-8 assay over 5 days incubation: (a) EA. hy926 and (b) VSMC; DMEM with serum worked as blank control, DMEM with 10% DMSO as positive control; data presented were statistically analyzed using a one-way ANOVA, *** Represents p?<?0.001.
Fig. 11. NO released of (a) EA. hy926 and (b) VSMC in the culture media for bare MgZnYNd, MgZnYNd-P, MgZnYNd-A-P and MgZnYNd-B-A-P samples. DMEM with serum worked as blank control. Data presented were statistically analyzed using a one-way ANOVA, *** Represents p?<?0.001.
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