J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (11): 2084-2090.DOI: 10.1016/j.jmst.2018.04.009
Special Issue: 2017-2018年Mg合金专题; Corrosion in 2018
• Orginal Article • Previous Articles Next Articles
Liping Wu, Changgang Wang, Durga Bhakta Pokharel, Ini-Ibehe Nabuk Etim, Lin Zhao, Junhua Dong*(), Wei Ke, Nan Chen
Received:
2017-11-02
Revised:
2018-01-30
Accepted:
2018-03-30
Online:
2018-11-20
Published:
2018-11-26
Contact:
Dong Junhua
Liping Wu, Changgang Wang, Durga Bhakta Pokharel, Ini-Ibehe Nabuk Etim, Lin Zhao, Junhua Dong, Wei Ke, Nan Chen. Effect of applied potential on the microstructure, composition and corrosion resistance evolution of fluoride conversion film on AZ31 magnesium alloy[J]. J. Mater. Sci. Technol., 2018, 34(11): 2084-2090.
Fig. 2. Surface morphologies of AZ31 Mg alloy polarized in deaerated 0.1 M KF solution of pH 7.5 at different potentials for different time: (a1) 56 s, -0.4 V; (a2) 96 s, -0.4 V; (a3) 660 s, -0.4 V; (a4) 1800s, -0.4 V; (a5) 16 ks, -0.4 V; (b1) 16 s, -0.6 V; (b2) 80 s, -0.6 V; (b3) 840 s, -0.6 V; (b4) 2180s, -0.6 V; (b5) 16 ks, -0.6 V; (c1) 96 s, -0.8 V; (c2) 300 s, -0.8 V; (c3) 1230s, -0.8 V; (c4) 2848s, -0.8 V; (c5) 16 ks, -0.8 V; (d1) 16 s,-1.0 V; (d2) 368 s,-1.0 V; (d3) 1080s,-1.0 V; (d4) 2272s,-1.0 V; (d5) 16 ks,-1.0 V; (e1) 56 s, -1.2 V; (e2) 496 s, -1.2 V; (e3) 1688s, -1.2 V; (e4) 3328s, -1.2 V; (e5) 16 ks, -1.2 V.
t (s) | Mg | O | F | K | |
---|---|---|---|---|---|
-0.4 V | 56 | + | + | - | - |
96 | + | + | + | - | |
660 | + | + | + | - | |
1800 | + | + | + | - | |
16000 | + | + | + | + | |
-0.6 V | 16 | + | + | - | - |
80 | + | + | + | - | |
840 | + | + | + | - | |
2180 | + | + | + | - | |
16000 | + | + | + | + | |
-0.8 V | 96 | + | + | - | - |
300 | + | + | - | - | |
1230 | + | + | + | - | |
2848 | + | + | + | - | |
16000 | + | + | + | + | |
-1.0 V | 16 | + | + | - | - |
368 | + | + | - | - | |
1080 | + | + | + | - | |
2272 | + | + | + | - | |
16000 | + | + | + | + | |
-1.2 V | 56 | + | + | - | - |
496 | + | + | - | - | |
1688 | + | + | + | - | |
3328 | + | + | + | - | |
16000 | + | + | + | + |
Table 1 Chemical compositions derived from EDS plots of AZ31 Mg alloy polarized at different potentials for different time. (+ represents Yes, - represents No).
t (s) | Mg | O | F | K | |
---|---|---|---|---|---|
-0.4 V | 56 | + | + | - | - |
96 | + | + | + | - | |
660 | + | + | + | - | |
1800 | + | + | + | - | |
16000 | + | + | + | + | |
-0.6 V | 16 | + | + | - | - |
80 | + | + | + | - | |
840 | + | + | + | - | |
2180 | + | + | + | - | |
16000 | + | + | + | + | |
-0.8 V | 96 | + | + | - | - |
300 | + | + | - | - | |
1230 | + | + | + | - | |
2848 | + | + | + | - | |
16000 | + | + | + | + | |
-1.0 V | 16 | + | + | - | - |
368 | + | + | - | - | |
1080 | + | + | + | - | |
2272 | + | + | + | - | |
16000 | + | + | + | + | |
-1.2 V | 56 | + | + | - | - |
496 | + | + | - | - | |
1688 | + | + | + | - | |
3328 | + | + | + | - | |
16000 | + | + | + | + |
Fig. 3. XRD patterns of AZ31 Mg alloy polarized at -0.4 V, -0.6 V, -0.8 V,-1.0 V, -1.2 V and-1.4 V in deaerated 0.1 M KF solution of pH 7.5 for 16 ks.
Fig. 4. XPS spectra of Mg-1s and F-1s of the fluoride conversion film deposited on AZ31 Mg alloy at (a) -0.4 V, (b) -0.6 V, (c) -0.8 V, (d) - 1.0 V and (e) -1.2 V in deaerated 0.1 M KF solution with pH 7.5 for 16 ks.
Fig. 5. XPS elemental and compositional depth profiles of fluoride conversion film deposited on AZ31 Mg alloy at (a-a') -0.4 V, (b-b') -0.6 V, (c-c') -0.8 V, (d-d') -1.0 V, (e-e') -1.2 V and (f-f') -1.4 V in deaerated 0.1 M KF solution with pH 7.5 for 16 ks.
Fig. 6. Cross-section morphologies of AZ31 Mg alloy polarized at (a) -0.4 V; (b) -0.6 V; (c) -0.8 V; (d) -1.0 V and (e) -1.2 V in deaerated 0.1 M KF solution of pH 7.5 for 16 ks.
Fig. 7. Nyquist plots in 0.1 M NaCl solution of AZ31 Mg alloy and samples polarized in deaerated 0.1 M KF solution with pH 7.5 at different potentials for 16 ks.
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