J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (9): 1660-1670.DOI: 10.1016/j.jmst.2018.01.008
Special Issue: Titanium Alloys 2018; Corrosion in 2018
• Orginal Article • Previous Articles Next Articles
Ji Liab, Yun Baib, Zhidong Fanab, Shujun Lib, Yulin Haob*(), Rui Yangb, Yongbo Gaoc
Received:
2017-02-04
Revised:
2017-04-17
Accepted:
2017-04-18
Online:
2018-09-20
Published:
2018-09-25
Contact:
Hao Yulin
Ji Li, Yun Bai, Zhidong Fan, Shujun Li, Yulin Hao, Rui Yang, Yongbo Gao. Effect of fluoride on the corrosion behavior of nanostructured Ti-24Nb-4Zr-8Sn alloy in acidulated artificial saliva[J]. J. Mater. Sci. Technol., 2018, 34(9): 1660-1670.
Fig 1. (a) Optical micrograph of CG; (b) TEM image and corresponding SAED pattern (inset) of NS Ti2448 sample; and (c) high resolution TEM image of NS Ti2448 sample.
Fig. 2. Potentiodynamic polarization curves: (a) CG and (b) NS Ti2448 alloys in acidulated artificial saliva (AAS) with various concentrations of F-; (c) comparison of current density between CG and NS Ti2448.
Fig. 4. Equivalent electrical circuit models used to fit the EIS experiment results obtained from Ti2448 alloys in AAS with various concentrations of F-: (a) 2 time constants and (b) 1 time constant.
Materials | RS (Ω cm2) | Rb (MΩ cm2) | Qb (μΩ-1 Sn cm-2) | nb | Rp (Ω cm2) | Qp (μΩ-1 Sn cm-2) | np |
---|---|---|---|---|---|---|---|
CG-Ti2448 | |||||||
CF- = 0 | 72.85 | 5.639 | 19.42 | 0.9250 | 6507 | 11.00 | 0.828 |
CF- = 0.01% | 94.77 | 0.202 | 89.08 | 0.9033 | 3044 | 54.09 | 0.6708 |
CF- = 0.1% | 39.69 | 0.099 | 166.1 | 0.7208 | - | - | - |
CF- = 1% | 6.560 | 0.021 | 1281 | 0.5173 | 790.4 | 420.5 | 0.5124 |
NS-Ti2448 | |||||||
CF- = 0 | 89.04 | 10.14 | 9.776 | 0.9525 | 103.5 | 0.0014 | 0.9102 |
CF- = 0.01% | 77.48 | 2.109 | 2.514 | 0.9233 | 3514 | 48.68 | 0.8258 |
CF- = 0.1% | 58.80 | 0.1625 | 167.6 | 0.8735 | - | - | - |
CF- = 1% | 7.741 | 0.019 | 1032 | 0.8329 | 1083 | 609.6 | 0.7203 |
Table 1 Representative fitting parameters obtained from the EIS data via ZsimpWin for CG and NS Ti2448 alloys in AAS with various concentrations of F- at the EOCP/V.
Materials | RS (Ω cm2) | Rb (MΩ cm2) | Qb (μΩ-1 Sn cm-2) | nb | Rp (Ω cm2) | Qp (μΩ-1 Sn cm-2) | np |
---|---|---|---|---|---|---|---|
CG-Ti2448 | |||||||
CF- = 0 | 72.85 | 5.639 | 19.42 | 0.9250 | 6507 | 11.00 | 0.828 |
CF- = 0.01% | 94.77 | 0.202 | 89.08 | 0.9033 | 3044 | 54.09 | 0.6708 |
CF- = 0.1% | 39.69 | 0.099 | 166.1 | 0.7208 | - | - | - |
CF- = 1% | 6.560 | 0.021 | 1281 | 0.5173 | 790.4 | 420.5 | 0.5124 |
NS-Ti2448 | |||||||
CF- = 0 | 89.04 | 10.14 | 9.776 | 0.9525 | 103.5 | 0.0014 | 0.9102 |
CF- = 0.01% | 77.48 | 2.109 | 2.514 | 0.9233 | 3514 | 48.68 | 0.8258 |
CF- = 0.1% | 58.80 | 0.1625 | 167.6 | 0.8735 | - | - | - |
CF- = 1% | 7.741 | 0.019 | 1032 | 0.8329 | 1083 | 609.6 | 0.7203 |
Fig. 5. XPS survey spectra of element depth profiles of CG and NS Ti2448 alloys after immersion in AAS with various concentrations of F- for 60 days: (a) CG-0.01%, (b) NS-0.01%, (c) CG- 0.1%, (d) NS- 0.1%, (e) CG-1%, (f) NS-1%.
Fig. 6. Typical XPS deconvolved spectra: (a) P 2p and (b) Ca 2p with sputtering of NS Ti2448 alloy for 10 s following immersion in AAS with 0.01% F- for 60 days.
Fig. 7. Typical XPS deconvolved spectra of F 1 s at five selected sputtering time points for CG (a) and NS (c) Ti2448 alloy after immersion in AAS with F- concentration of 1% for 60 d and after sputtering for 170 s ((b) for CG and (d) for NS).
Fig. 8. (a, c, e) Surface morphology of CG Ti2448 after 60 days immersion in AAS with various concentrations of F-: (a-b) CF- = 0.01%; (c-d) CF- = 0.1%; (e-f) CF- = 1%. Images (b, d, f) present high magnification images of the same.
Fig. 9. (a, c, e) Surface morphology of NS Ti2448 after 60 days immersion in AAS with various concentrations of F-: (a-b) CF- = 0.01%; (c-d) CF- = 0.1%; (e-f) CF- = 1% Images (b, d, f) present high magnification images of the same.
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