J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (11): 2149-2159.DOI: 10.1016/j.jmst.2018.02.017
Special Issue: Stainless Steel & High Strength Steel 2018
• Orginal Article • Previous Articles Next Articles
Xinrui Zhangab, Jinlong Zhaoab, Tong Xib, M. Babar Shahzadb, Chunguang Yangb*(
), Ke Yangb*(
)
Received:2017-11-16
Revised:2018-01-13
Accepted:2018-02-05
Online:2018-11-20
Published:2018-11-26
Contact:
Yang Chunguang,Yang Ke
Xinrui Zhang, Jinlong Zhao, Tong Xi, M. Babar Shahzad, Chunguang Yang, Ke Yang. Dissolution and repair of passive film on Cu-bearing 304L stainless steels immersed in H2SO4 solution[J]. J. Mater. Sci. Technol., 2018, 34(11): 2149-2159.
Fig. 2. Electrochemical impedance diagrams of solution ((a) Nyquist and (b) Bode plots) and aging ((c) Nyquist and (d) Bode plots) treated 304L-Cu SSs after immersion in 0.5 M H2SO4 for different time.
| Heat treatments | Immersion time (day) | Rs (Ω cm2) | Qf × 10-5 (Ω-1 cm-2) | nf | Rf (kΩ cm2) | Qdl × 10-5 (Ω-1 cm-2) | ndl | Rct (kΩ cm2) |
|---|---|---|---|---|---|---|---|---|
| Solution | 0 | 2.34 | 5.72 | 0.97 | 307.62 | 3.49 | 0.87 | 513.72 |
| 2 | 2.53 | 5.41 | 0.91 | 271.53 | 2.50 | 0.85 | 424.15 | |
| 7 | 2.51 | 5.35 | 0.90 | 47.90 | 1.96 | 0.85 | 61.01 | |
| 12 | 2.51 | 5.61 | 0.90 | 56.73 | 2.81 | 0.60 | 389.13 | |
| 14 | 2.52 | 5.37 | 0.90 | 62.68 | 3.25 | 0.60 | 462.77 | |
| Aging | 0 | 2.11 | 4.37 | 0.91 | 62.75 | 1.65 | 0.70 | 246.83 |
| 2 | 1.90 | 4.04 | 0.91 | 21.65 | 1.62 | 0.61 | 165.51 | |
| 7 | 1.43 | 4.43 | 0.90 | 13.09 | 2.70 | 0.68 | 56.13 | |
| 12 | 2.57 | 4.41 | 0.88 | 13.67 | 1.72 | 0.52 | 148.56 | |
| 14 | 1.67 | 3.99 | 0.91 | 14.86 | 1.20 | 0.53 | 221.34 |
Table 1 Fitted corrosion parameters from EIS tests for the solution and aging treated 304L-Cu SS immersion in 0.5 M H2SO4 for different time.
| Heat treatments | Immersion time (day) | Rs (Ω cm2) | Qf × 10-5 (Ω-1 cm-2) | nf | Rf (kΩ cm2) | Qdl × 10-5 (Ω-1 cm-2) | ndl | Rct (kΩ cm2) |
|---|---|---|---|---|---|---|---|---|
| Solution | 0 | 2.34 | 5.72 | 0.97 | 307.62 | 3.49 | 0.87 | 513.72 |
| 2 | 2.53 | 5.41 | 0.91 | 271.53 | 2.50 | 0.85 | 424.15 | |
| 7 | 2.51 | 5.35 | 0.90 | 47.90 | 1.96 | 0.85 | 61.01 | |
| 12 | 2.51 | 5.61 | 0.90 | 56.73 | 2.81 | 0.60 | 389.13 | |
| 14 | 2.52 | 5.37 | 0.90 | 62.68 | 3.25 | 0.60 | 462.77 | |
| Aging | 0 | 2.11 | 4.37 | 0.91 | 62.75 | 1.65 | 0.70 | 246.83 |
| 2 | 1.90 | 4.04 | 0.91 | 21.65 | 1.62 | 0.61 | 165.51 | |
| 7 | 1.43 | 4.43 | 0.90 | 13.09 | 2.70 | 0.68 | 56.13 | |
| 12 | 2.57 | 4.41 | 0.88 | 13.67 | 1.72 | 0.52 | 148.56 | |
| 14 | 1.67 | 3.99 | 0.91 | 14.86 | 1.20 | 0.53 | 221.34 |
| Heat treatments | Immersion time (day) | Donor density, ND (cm-3) | Acceptor density, NA (cm-3) |
|---|---|---|---|
| Solution | 0 | 3.14 × 1021 | 8.44 × 1021 |
| 2 | 3.78 × 1021 | 9.37 × 1021 | |
| 7 | 8.08 × 1021 | 9.80 × 1021 | |
| 12 | 5.32 × 1021 | 6.03 × 1021 | |
| 14 | 4.98 × 1021 | 5.13 × 1021 | |
| Aging | 0 | 3.71 × 1021 | 8.68 × 1021 |
| 2 | 4.03 × 1021 | 9.70 × 1021 | |
| 7 | 9.18 × 1021 | 9.88 × 1021 | |
| 12 | 6.86 × 1021 | 7.50 × 1021 | |
| 14 | 5.82 × 1021 | 7.48 × 1021 |
Table 2 Charge carrier density of solution and aging treated 304L-Cu SS after immersion in 0.5 M H2SO4 for different time.
| Heat treatments | Immersion time (day) | Donor density, ND (cm-3) | Acceptor density, NA (cm-3) |
|---|---|---|---|
| Solution | 0 | 3.14 × 1021 | 8.44 × 1021 |
| 2 | 3.78 × 1021 | 9.37 × 1021 | |
| 7 | 8.08 × 1021 | 9.80 × 1021 | |
| 12 | 5.32 × 1021 | 6.03 × 1021 | |
| 14 | 4.98 × 1021 | 5.13 × 1021 | |
| Aging | 0 | 3.71 × 1021 | 8.68 × 1021 |
| 2 | 4.03 × 1021 | 9.70 × 1021 | |
| 7 | 9.18 × 1021 | 9.88 × 1021 | |
| 12 | 6.86 × 1021 | 7.50 × 1021 | |
| 14 | 5.82 × 1021 | 7.48 × 1021 |
Fig. 5. AFM images for the passive film of solution (a, b, c) and aging (d, e, f) treated 304L-Cu SSs after immersion in 0.5 M H2SO4 for different time: (a, d) 0 day, (b, e) 7 days, (c, f) 14 days.
| Heat treatments | Immersion time (day) | Rq(nm) |
|---|---|---|
| Solution | 0 | 6.61 |
| 7 | 9.50 | |
| 14 | 6.05 | |
| Aging | 0 | 7.33 |
| 7 | 11.17 | |
| 14 | 7.68 |
Table 3 Calculated root mean square roughness (Rq) for the solution and aging treated 304L-Cu SS immersed in 0.5 M H2SO4 for different time.
| Heat treatments | Immersion time (day) | Rq(nm) |
|---|---|---|
| Solution | 0 | 6.61 |
| 7 | 9.50 | |
| 14 | 6.05 | |
| Aging | 0 | 7.33 |
| 7 | 11.17 | |
| 14 | 7.68 |
Fig. 6. XPS spectra of Cr 2p and Cu 2p detected in the passive film of solution treated 304L-Cu SSs after immersion in 0.5 M H2SO4 for different time: (a, d) 0 day, (b, e) 7 days, (c, f) 14 days.
Fig. 7. XPS spectra of Cr 2p and Cu 2p detected in the passive film of aged 304L-Cu SSs after immersion in 0.5 M H2SO4 for different time: (a, d) 0 day, (b, e) 7 days, (c, f) 14 days.
| Heat treatments | Immersion time (day) | Cr3+ (at.%) | Cu (at.%) | CuO (at.%) |
|---|---|---|---|---|
| Solution | 0 | 11.77 | 2.27 | 0.77 |
| 7 | 7.73 | 2.70 | 3.38 | |
| 14 | 12.24 | 1.99 | 2.42 | |
| Aging | 0 | 10.21 | 3.17 | 0.61 |
| 7 | 4.74 | 4.00 | 4.67 | |
| 14 | 10.66 | 2.30 | 2.83 |
Table 4 Parameters for decomposition of Cr 2p and Cu 2p spectra for the solution and aging treated 304L-Cu SS after immersion in 0.5 M H2SO4 for different time.
| Heat treatments | Immersion time (day) | Cr3+ (at.%) | Cu (at.%) | CuO (at.%) |
|---|---|---|---|---|
| Solution | 0 | 11.77 | 2.27 | 0.77 |
| 7 | 7.73 | 2.70 | 3.38 | |
| 14 | 12.24 | 1.99 | 2.42 | |
| Aging | 0 | 10.21 | 3.17 | 0.61 |
| 7 | 4.74 | 4.00 | 4.67 | |
| 14 | 10.66 | 2.30 | 2.83 |
Fig. 8. Composition depth profiles of passive films of solution (a, b, c) and aging (d, e, f) treated 304L-Cu SSs after immersion in 0.5 M H2SO4 for different time: (a, d) 0 day, (b, e) 7 days, (c, f) 14 days.
| Heat treatments | Immersion time (day) | Thickness(nm) |
|---|---|---|
| Solution | 0 | 4.95 |
| 7 | 1.15 | |
| 14 | 1.45 | |
| Aging | 0 | 3.98 |
| 7 | 0.70 | |
| 14 | 1.18 |
Table 5 Estimated thicknesses of passive film for the solution and aging treated 304L-Cu SS after immersion in 0.5 M H2SO4 for different time.
| Heat treatments | Immersion time (day) | Thickness(nm) |
|---|---|---|
| Solution | 0 | 4.95 |
| 7 | 1.15 | |
| 14 | 1.45 | |
| Aging | 0 | 3.98 |
| 7 | 0.70 | |
| 14 | 1.18 |
|
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