J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (9): 2086-2098.DOI: 10.1016/j.jmst.2019.04.012
• Orginal Article • Previous Articles Next Articles
Cheng Zhangab, Liang Wuab*(
), Guangsheng Huangabc*(), Lin Chenab, Dabiao Xiaab, Bin Jiangabc, Andrej Atrensd, Fusheng Panabc
Received:2018-08-27
Revised:2018-10-06
Accepted:2018-10-23
Online:2019-09-20
Published:2019-07-26
Contact:
Wu Liang,Huang Guangsheng
About author:1 These authors contributed equally to this work.
Cheng Zhang, Liang Wu, Guangsheng Huang, Lin Chen, Dabiao Xia, Bin Jiang, Andrej Atrens, Fusheng Pan. Effects of Fe concentration on microstructure and corrosion of Mg-6Al-1Zn-xFe alloys for fracturing balls applications[J]. J. Mater. Sci. Technol., 2019, 35(9): 2086-2098.
Fig. 1. Schematic illustration of staged fracturing of a horizontal well.
Fig. 2. Schematic diagram of the preparation of the materials.
| Samples | Fe | Zn | Al | Mg |
|---|---|---|---|---|
| Mg-6Al-1Zn | 0.03 | 0.89 | 7.00 | Bal. |
| Mg-6Al-1Zn-1Fe | 1.20 | 0.86 | 7.13 | Bal. |
| Mg-6Al-1Zn-3Fe | 3.10 | 0.88 | 6.92 | Bal. |
| Mg-6Al-1Zn-5Fe | 4.78 | 0.92 | 7.28 | Bal. |
| Mg-6Al-1Zn-7Fe | 6.74 | 0.94 | 6.58 | Bal. |
Table 1 Chemical composition of the five alloys (wt%).
| Samples | Fe | Zn | Al | Mg |
|---|---|---|---|---|
| Mg-6Al-1Zn | 0.03 | 0.89 | 7.00 | Bal. |
| Mg-6Al-1Zn-1Fe | 1.20 | 0.86 | 7.13 | Bal. |
| Mg-6Al-1Zn-3Fe | 3.10 | 0.88 | 6.92 | Bal. |
| Mg-6Al-1Zn-5Fe | 4.78 | 0.92 | 7.28 | Bal. |
| Mg-6Al-1Zn-7Fe | 6.74 | 0.94 | 6.58 | Bal. |
Fig. 3. Optical micrographs of as-extruded Mg-6Al-1Zn-xFe (wt%) alloys: x = (a) 0, (b) 1, (c) 3, (d) 5 and (e) 7, respectively.
Fig. 4. SEM micrographs of as-extruded Mg-6Al-1Zn-xFe (wt%) alloys: x = (a) 0, (b) 1, (c) 3, (d) 5 and (e) 7, respectively.
Fig. 5. EDS analyses of as-extruded Mg-6Al-1Zn-3Fe alloy.
Fig. 6. Optical micrographs of as-annealed Mg-6Al-1Zn-xFe (wt%) alloys: x = (a) 0, (b) 1, (c) 3, (d) 5 and (e) 7, respectively.
Fig. 7. SEM micrographs of as-annealed Mg-6Al-1Zn-xFe (wt%) alloys: x = (a) 0, (b) 1, (c) 3, (d) 5 and (e) 7, respectively.
Fig. 8. TEM analyses for as-annealed Mg-6Al-1Zn-7Fe alloy: (a) the morphology and corresponding EDS result of Fe particle, (b) the morphology and corresponding EDS result of β-Mg17Al12 phase, (c) and (d) dislocations.
Fig. 9. Hydrogen evolution rates for Mg-6Al-1Zn-xFe (x = 0, 1, 3, 5 and 7 wt%) alloys during immersion in 3.5 wt% NaCl solution for 10 h: (a) as-extruded alloys and (b) as-annealed alloys.
Fig. 10. Weight loss rates and optical morphologies of Mg-6Al-1Zn-xFe (x = 0, 1, 3, 5 and 7 wt%) alloys after immersion in 3.5 wt% NaCl solution for two days.
Fig. 11. Open circuit potentials of Mg-6Al-1Zn-xFe (x = 0, 1, 3, 5 and 7 wt%) alloys after immersion in 3.5 wt% NaCl solution: (a) as-extruded alloys and (b) as-annealed alloys.
Fig. 12. Potentiodynamic polarization curves of Mg-6Al-1Zn-xFe (x = 0, 1, 3, 5 and 7 wt%) alloys after immersion in 3.5 wt% NaCl solution for 600 s: (a) as-extruded alloys and (b) as-annealed alloys.
| Samples | Equilibrium potential Ecorr (V) | Corrosion Current Density icorr (A cm-2) | Corrosion rate, (mm y-1) | |
|---|---|---|---|---|
| As-extruded | Mg-6Al-1Zn | -1.493 | 1.20 × 10-3 | 27 |
| Mg-6Al-1Zn-1Fe | -1.468 | 1.51 × 10-3 | 34 | |
| Mg-6Al-1Zn-3Fe | -1.483 | 2.34 × 10-3 | 53 | |
| Mg-6Al-1Zn-5Fe | -1.437 | 4.01 × 10-3 | 91 | |
| Mg-6Al-1Zn-7Fe | -1.482 | 5.13 × 10-3 | 116 | |
| As-annealed | Mg-6Al-1Zn | -1.486 | 6.93 × 10-4 | 17 |
| Mg-6Al-1Zn-1Fe | -1.468 | 1.06 × 10-3 | 24 | |
| Mg-6Al-1Zn-3Fe | -1.447 | 1.84 × 10-3 | 42 | |
| Mg-6Al-1Zn-5Fe | -1.476 | 3.40 × 10-3 | 77 | |
| Mg-6Al-1Zn-7Fe | -1.461 | 4.12 × 10-3 | 93 | |
Table 2 Corrosion parameters obtained from polarization curves.
| Samples | Equilibrium potential Ecorr (V) | Corrosion Current Density icorr (A cm-2) | Corrosion rate, (mm y-1) | |
|---|---|---|---|---|
| As-extruded | Mg-6Al-1Zn | -1.493 | 1.20 × 10-3 | 27 |
| Mg-6Al-1Zn-1Fe | -1.468 | 1.51 × 10-3 | 34 | |
| Mg-6Al-1Zn-3Fe | -1.483 | 2.34 × 10-3 | 53 | |
| Mg-6Al-1Zn-5Fe | -1.437 | 4.01 × 10-3 | 91 | |
| Mg-6Al-1Zn-7Fe | -1.482 | 5.13 × 10-3 | 116 | |
| As-annealed | Mg-6Al-1Zn | -1.486 | 6.93 × 10-4 | 17 |
| Mg-6Al-1Zn-1Fe | -1.468 | 1.06 × 10-3 | 24 | |
| Mg-6Al-1Zn-3Fe | -1.447 | 1.84 × 10-3 | 42 | |
| Mg-6Al-1Zn-5Fe | -1.476 | 3.40 × 10-3 | 77 | |
| Mg-6Al-1Zn-7Fe | -1.461 | 4.12 × 10-3 | 93 | |
Fig. 13. Optical micrographs of Mg-6Al-1Zn-xFe (x = 0, 1, 3, 5 and 7 wt%) alloys after immersion in 3.5 wt% NaCl solution for 10 min: (a) as-extruded alloys and (b) as-annealed alloys.
Fig. 14. SEM micrographs of Mg-6Al-1Zn-xFe (x = 0, 1, 3, 5 and 7 wt%) alloys after immersion in 3.5 wt% NaCl solution for 10 min: (a) as-extruded alloys and (b) as-annealed alloys.
Fig. 15. SEM micrographs and EDS results of as-annealed Mg-6Al-1Zn-7Fe alloy after immersion in 3.5 wt% NaCl solution for 10 min.
Fig. 16. Compressive properties of as-extruded Mg-6Al-1Zn-xFe (x = 0, 1, 3, 5 and 7 wt%) alloys.
Fig. 17. Compressive properties of as-annealed Mg-6Al-1Zn-xFe (x = 0, 1, 3, 5 and 7 wt%) alloys.
Fig. 18. Fracture surface of Mg-6Al-1Zn-xFe (x = 0, 1, 3, 5 and 7 wt%) alloys: (a) as-extruded alloys and (b) as-annealed alloys.
Fig. 19. Schematic illustration of Mg-6Al-1Zn-xFe (x = 0, 1, 3, 5 and 7 wt%) alloys.
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