J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (9): 1550-1557.DOI: 10.1016/j.jmst.2018.05.014
Special Issue: 2017-2018年Mg合金专题; Corrosion in 2018
• Orginal Article • Previous Articles Next Articles
Zi-You Dinga, Lan-Yue Cuia, Rong-Chang Zenga*(), Yan-Bin Zhaoa, Shao-Kang Guanb, Dao-Kui Xuc*(), Cun-Guo Linde
Received:
2018-02-08
Revised:
2018-04-23
Accepted:
2018-04-24
Online:
2018-09-20
Published:
2018-09-25
Contact:
Zeng Rong-Chang,Xu Dao-Kui
Zi-You Ding, Lan-Yue Cui, Rong-Chang Zeng, Yan-Bin Zhao, Shao-Kang Guan, Dao-Kui Xu, Cun-Guo Lin. Exfoliation corrosion of extruded Mg-Li-Ca alloy[J]. J. Mater. Sci. Technol., 2018, 34(9): 1550-1557.
Fig. 2. OM images: (a) longitudinal section, (b) transverse section; and SEM images: (c) longitudinal section, (d) transverse section of extruded Mg-1Li-1Ca.
Element | Spectrum #1 at.%/wt.% | Spectrum #2 at.%/wt.% | Spectrum #3 at.%/wt.% |
---|---|---|---|
O | 1.62/1.06 | 4.56/3.02 | 10.52/7.07 |
Mg | 96.47/95.80 | 93.86/94.36 | 87.10/88.93 |
Ca | 1.92/3.14 | 1.58/2.62 | 2.38/4.00 |
Table 1 Composition of spectrums at second phase detected by EDS, at.%/wt.%.
Element | Spectrum #1 at.%/wt.% | Spectrum #2 at.%/wt.% | Spectrum #3 at.%/wt.% |
---|---|---|---|
O | 1.62/1.06 | 4.56/3.02 | 10.52/7.07 |
Mg | 96.47/95.80 | 93.86/94.36 | 87.10/88.93 |
Ca | 1.92/3.14 | 1.58/2.62 | 2.38/4.00 |
Fig. 4. Corrosion macro-morphology of extruded Mg-1Li-1Ca specimens immersed in 3.5 wt.% NaCl aqueous solution for 90 d (a), (b), and (c), 120 d (d) (e), 150 d (f), (g), (h).
Fig. 5. Optical micrographs of skin and interior zone of extruded Mg-1Li-1Ca alloy after immersion in 3.5 wt.% NaCl solution for 24 h: corrosion morphology of (a) transverse section, (b) (c) (d) longitudinal section.
Fig. 6. (a) Open circuit potential as a function of immersion time and (b) polarization curves of inner zone and outer layer of extruded Mg-1Li-1Ca alloy in 3.5 wt.% NaCl solution.
Fig. 8. Chemical components: (a) XRD patterns of substrate and corrosion products after specific treatments and (b) FT-IR patterns of corrosion debris: a, b, c and water-soluble corrosion products: d, e, f.
Fig. 9. Schematic illustrations of exfoliation corrosion mechanism: (a) macro-galvanic corrosion between skin layer and interior zone, (b) micro-galvanic corrosion between Mg2Ca and α-Mg, (c) wedge effect and hydrogen blistering during exfoliation corrosion, (d) pitting corrosion and filiform corrosion.
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