材料科学与技术 ›› 2018, Vol. 34 ›› Issue (2): 299-310.DOI: 10.1016/j.jmst.2017.06.013
所属专题: Corrosion in 2018; Biomaterials 2018
收稿日期:
2017-03-06
修回日期:
2017-05-25
接受日期:
2017-06-08
出版日期:
2018-02-10
发布日期:
2018-02-10
Jian-Xing Lia, Yuan Zhanga, Jing-Yuan Lia(), Jian-Xin Xieb
Received:
2017-03-06
Revised:
2017-05-25
Accepted:
2017-06-08
Online:
2018-02-10
Published:
2018-02-10
. [J]. 材料科学与技术, 2018, 34(2): 299-310.
Jian-Xing Li, Yuan Zhang, Jing-Yuan Li, Jian-Xin Xie. Effect of trace HA on microstructure, mechanical properties and corrosion behavior of Mg-2Zn-0.5Sr alloy[J]. J. Mater. Sci. Technol., 2018, 34(2): 299-310.
Alloy | Mg | Zn | Sr | Al | Cu | Fe | Ni | HA |
---|---|---|---|---|---|---|---|---|
Pure | Bal. | / | / | 0.056 | <0.001 | 0.022 | <0.001 | / |
Mg-2Zn-0.5Sr | Bal. | 2.03 | 0.54 | 0.074 | <0.001 | 0.0033 | <0.001 | / |
Mg-2Zn-0.5Sr/0.1HA | Bal. | 2.10 | 0.54 | 0.063 | <0.001 | 0.0026 | <0.001 | 0.0251 |
Mg-2Zn-0.5Sr/0.3HA | Bal. | 1.96 | 0.60 | 0.074 | <0.001 | 0.0033 | <0.001 | 0.2359 |
Table 1 Actual chemical composition of the alloys (wt%).
Alloy | Mg | Zn | Sr | Al | Cu | Fe | Ni | HA |
---|---|---|---|---|---|---|---|---|
Pure | Bal. | / | / | 0.056 | <0.001 | 0.022 | <0.001 | / |
Mg-2Zn-0.5Sr | Bal. | 2.03 | 0.54 | 0.074 | <0.001 | 0.0033 | <0.001 | / |
Mg-2Zn-0.5Sr/0.1HA | Bal. | 2.10 | 0.54 | 0.063 | <0.001 | 0.0026 | <0.001 | 0.0251 |
Mg-2Zn-0.5Sr/0.3HA | Bal. | 1.96 | 0.60 | 0.074 | <0.001 | 0.0033 | <0.001 | 0.2359 |
Solution | Ion concentration (mmol/L) | |||||||
---|---|---|---|---|---|---|---|---|
Na+ | K+ | Ca2+ | Mg2+ | HCO3- | Cl- | HPO42- | SO42- | |
Plasma | 142.0 | 5.0 | 2.5 | 1.5 | 27.0 | 103.0 | 1.0 | 0.5 |
Kokubo(c-SBF) | 142.0 | 5.0 | 2.5 | 1.5 | 4.2 | 147.8 | 1.0 | 0.5 |
Table 2 Chemical composition of the Kokubo simulated body fluid (SBF) compared to that of human blood plasma.
Solution | Ion concentration (mmol/L) | |||||||
---|---|---|---|---|---|---|---|---|
Na+ | K+ | Ca2+ | Mg2+ | HCO3- | Cl- | HPO42- | SO42- | |
Plasma | 142.0 | 5.0 | 2.5 | 1.5 | 27.0 | 103.0 | 1.0 | 0.5 |
Kokubo(c-SBF) | 142.0 | 5.0 | 2.5 | 1.5 | 4.2 | 147.8 | 1.0 | 0.5 |
Alloy | Region A | Region B | Region C | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Mg | Zn | Sr | Ca | Mg | Zn | Sr | Ca | Mg | Zn | Sr | Ca | |
Mg-2Zn-0.5Sr | 98.25 | 1.75 | - | - | 73.33 | 6.78 | 19.89 | - | - | - | - | |
Mg-2Zn-0.5Sr/0.1HA | 98.06 | 1.94 | - | - | 75.92 | 5.61 | 13.18 | 5.29 | 89.41 | 1.93 | 5.92 | 2.74 |
Mg-2Zn-0.5Sr/0.3HA | 98.05 | 1.95 | - | - | 60.54 | 4.01 | 23.66 | 11.79 | 70.72 | 2.91 | 18.53 | 7.84 |
Mg-2Zn-0.5Sr/0.3HA | 98.05 | 1.95 | - | - | 60.54 | 4.01 | 23.66 | 11.79 | 70.72 | 2.91 | 18.53 | 7.84 |
Table 3 Composition of different regions in the microstructure of the specimens in wt% (marked as A, B and C in Fig. 2) obtained by energy-dispersive X-ray spectroscopy.
Alloy | Region A | Region B | Region C | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Mg | Zn | Sr | Ca | Mg | Zn | Sr | Ca | Mg | Zn | Sr | Ca | |
Mg-2Zn-0.5Sr | 98.25 | 1.75 | - | - | 73.33 | 6.78 | 19.89 | - | - | - | - | |
Mg-2Zn-0.5Sr/0.1HA | 98.06 | 1.94 | - | - | 75.92 | 5.61 | 13.18 | 5.29 | 89.41 | 1.93 | 5.92 | 2.74 |
Mg-2Zn-0.5Sr/0.3HA | 98.05 | 1.95 | - | - | 60.54 | 4.01 | 23.66 | 11.79 | 70.72 | 2.91 | 18.53 | 7.84 |
Mg-2Zn-0.5Sr/0.3HA | 98.05 | 1.95 | - | - | 60.54 | 4.01 | 23.66 | 11.79 | 70.72 | 2.91 | 18.53 | 7.84 |
Alloy | Ecorr (mV/SCE) | Icorr (μA cm-2) | Ebd (mV) | Pi (mm/year) | βC (mV/decade) | βa (mV/decade) | RP (kΩ cm2) |
---|---|---|---|---|---|---|---|
Pure Mg | -1719 | 288.4 | -1549 | 6.6 | -369.5 | 431.3 | 0.30 |
Mg-2Zn-0.5Sr | -1724 | 479.8 | -1549 | 11.0 | -433.8 | 280.1 | 0.15 |
Mg-2Zn-0.5Sr/0.1HA | -1696 | 290.8 | -1551 | 6.6 | -388.5 | 274.3 | 0.24 |
Mg-2Zn-0.5Sr/0.3HA | -1660 | 280.8 | -1548 | 6.2 | -367.3 | 253.9 | 0.24 |
Table 4 Electrochemical parameters of the samples in SBF obtained from the polarization test.
Alloy | Ecorr (mV/SCE) | Icorr (μA cm-2) | Ebd (mV) | Pi (mm/year) | βC (mV/decade) | βa (mV/decade) | RP (kΩ cm2) |
---|---|---|---|---|---|---|---|
Pure Mg | -1719 | 288.4 | -1549 | 6.6 | -369.5 | 431.3 | 0.30 |
Mg-2Zn-0.5Sr | -1724 | 479.8 | -1549 | 11.0 | -433.8 | 280.1 | 0.15 |
Mg-2Zn-0.5Sr/0.1HA | -1696 | 290.8 | -1551 | 6.6 | -388.5 | 274.3 | 0.24 |
Mg-2Zn-0.5Sr/0.3HA | -1660 | 280.8 | -1548 | 6.2 | -367.3 | 253.9 | 0.24 |
Fig. 8. Corrosion rates of experimental materials calculated by the weight loss after 10 d of immersion and the Tafel curve in the SBF at (37 ± 1) °C.
Fig. 9. SEM and EDS of the surface of experimental materials after 10 d of immersion in the SBF at (37 ± 1) °C, for (a) pure Mg, (b) Mg-2Zn-0.5Sr, (c) Mg-2Zn-0.5Sr/0.1HA and (d) Mg-2Zn-0.5Sr/0.3HA.
Fig. 11. Three-dimensional corrosion morphology of the samples after corrosion product removal for (a) pure Mg, (b) Mg-2Zn-0.5Sr, (c) Mg-2Zn-0.5Sr/0.1HA and (d) Mg-2Zn-0.5Sr/0.3HA.
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