J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (9): 971-988.DOI: 10.1016/j.jmst.2017.01.005
Special Issue: 2017腐蚀与防护专辑
• Orginal Article • Previous Articles Next Articles
Cui Lan-Yueab, Hu Yanab, Zeng Rong-Changab*(), Yang Yong-Xinab, Sun Dan-Dana, Li Shuo-Qiab, Zhang Fenab, Han En-Houc
Received:
2016-08-21
Revised:
2016-11-22
Accepted:
2016-12-05
Online:
2017-09-20
Published:
2017-10-16
Contact:
Zeng Rong-Chang
About author:
1 The authors contributed equally to this work.
Cui Lan-Yue, Hu Yan, Zeng Rong-Chang, Yang Yong-Xin, Sun Dan-Dan, Li Shuo-Qi, Zhang Fen, Han En-Hou. New insights into the effect of Tris-HCl and Tris on corrosion of magnesium alloy in presence of bicarbonate, sulfate, hydrogen phosphate and dihydrogen phosphate ions[J]. J. Mater. Sci. Technol., 2017, 33(9): 971-988.
Solutions | NaCl | NaHCO3 | MgSO4·7H2O | Na2HPO4·12H2O | KH2PO4 | Tris-HCl/Tris |
---|---|---|---|---|---|---|
#1/1′ | 153.0 | 50.5/50.5 | ||||
#2/2′ | 153.0 | 4.17 | 50.5/50.5 | |||
#3/3′ | 153.0 | 8.33 | 50.5/50.5 | |||
#4/4′ | 153.0 | 11.91 | 50.5/50.5 | |||
#5/5′ | 153.0 | 0.24 | 50.5/50.5 | |||
#6/6′ | 153.0 | 0.48 | 50.5/50.5 | |||
#7/7′ | 153.0 | 0.81 | 50.5/50.5 | |||
#8/8′ | 153.0 | 0.17 | 50.5/50.5 | |||
#9/9′ | 153.0 | 0.34 | 50.5/50.5 | |||
#10/10′ | 153.0 | 0.56 | 50.5/50.5 | |||
#11/11′ | 153.0 | 0.44 | 50.5/50.5 | |||
#12/12′ | 153.0 | 0.89 | 50.5/50.5 | |||
#13/13′ | 153.0 | 1.48 | 50.5/50.5 |
Table 1 Chemical composition of the solutions (mmol/L).
Solutions | NaCl | NaHCO3 | MgSO4·7H2O | Na2HPO4·12H2O | KH2PO4 | Tris-HCl/Tris |
---|---|---|---|---|---|---|
#1/1′ | 153.0 | 50.5/50.5 | ||||
#2/2′ | 153.0 | 4.17 | 50.5/50.5 | |||
#3/3′ | 153.0 | 8.33 | 50.5/50.5 | |||
#4/4′ | 153.0 | 11.91 | 50.5/50.5 | |||
#5/5′ | 153.0 | 0.24 | 50.5/50.5 | |||
#6/6′ | 153.0 | 0.48 | 50.5/50.5 | |||
#7/7′ | 153.0 | 0.81 | 50.5/50.5 | |||
#8/8′ | 153.0 | 0.17 | 50.5/50.5 | |||
#9/9′ | 153.0 | 0.34 | 50.5/50.5 | |||
#10/10′ | 153.0 | 0.56 | 50.5/50.5 | |||
#11/11′ | 153.0 | 0.44 | 50.5/50.5 | |||
#12/12′ | 153.0 | 0.89 | 50.5/50.5 | |||
#13/13′ | 153.0 | 1.48 | 50.5/50.5 |
Fig. 2. HERs of the AZ31 alloys in (a) solutions #1-4, (b) solutions #1′-4′, (c) solutions #5-7, (d) solutions #5′-7′, (e) solutions #8-10, (f) solutions #8′-10′, (g) solutions #11-13, (h) solutions #11′-13′.
Fig. 3. Variation in pH values of the AZ31 alloy in (a) solutions #1-4, (b) solutions #1′-4′, (c) solutions #5-7, (d) solutions #5′-7′, (e) solutions #8-10, (f) solutions #8′-10′, (g) solutions #11-13, (h) solutions #11′-13′.
Fig. 4. Open circuit potential curves of AZ31 alloy immersed in (a) solutions #1-4, (b) solutions #1′-4′, (c) solutions #5-7, (d) solutions #5′-7′, (e) solutions #8-10, (f) solutions #8′-10′, (g) solutions #11-13, (h) solutions #11′-13′.
Fig. 5. Polarization curves of the AZ31 alloy in (a) solutions #1-4, (b) solutions #1′-4′, (c) solutions #5-7, (d) solutions #5′-7′, (e) solutions #8-10, (f) solutions #8′-10′, (g) solutions #11-13, (h) solutions #11′-13′.
Fig. 6. (a) Initial pH values in solutions #1-13, (b) pH value of samples among saline solution and saline solution with Tris-HCl/Tris during an immersion of 6 h, (c) pH values after immersed for 6 h in solutions #1-13.
Fig. 7. (a) HER of samples among saline solution and saline solution with Tris-HCl/Tris during an immersion of 6 h, (b) HERs of alloys after immersion for 6 h at 37.5℃.
Fig. 9. Corrosion morphologies of samples after immersion for 6 h in solutions containing Tris-HCl: (a) #1, (b) #2, (c) #3, (d) #4, (e) #5, (f) #6, (g) #7, (h) #8, (i) #9, (j) #10, (k) #11, (l)# 12 and (m) #13.
Fig. 10. Corrosion morphologies of samples after 18 h of immersion in solutions containing Tris: (a) #1′, (b) #2′, (c) #3′, (d) #4′, (e) #5′, (f) #6′, (g) #7′, (h) #8′, (i) #9′, (j) #10′, (k) #11′, (l)# 12′ and (m) #13′.
Solutions | Spectrums | Elements (at.%) | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
C | O | Mg | Al | Cl | Zn | Mn | Si | S | P | ||
#1 | 1 | 13.45 | 56.00 | 26.91 | 1.71 | 1.69 | 0.24 | - | - | - | - |
2 | 19.69 | 38.97 | 30.21 | 10.95 | 0.08 | 0.10 | - | - | - | - | |
3 | - | 17.31 | 80.68 | 0.89 | 0.96 | 0.16 | - | - | - | - | |
#2 | 1 | 6.20 | 61.94 | 21.04 | 7.71 | 2.34 | 0.76 | - | - | - | - |
2 | 18.98 | 28.20 | 11.25 | 23.68 | 0.25 | 0.25 | 17.18 | 0.20 | - | - | |
3 | 13.28 | 42.81 | 39.30 | 2.53 | 1.76 | 0.33 | - | - | - | - | |
#3 | 1 | 16.55 | 3.04 | 78.85 | 1.35 | - | 0.21 | - | - | - | - |
2 | 13.44 | 28.77 | 49.88 | 2.37 | 5.29 | 0.25 | - | - | - | - | |
3 | 18.57 | 38.14 | 39.05 | 3.42 | 0.52 | 0.30 | - | - | - | - | |
#4 | 1 | 5.81 | 61.15 | 21.98 | 8.65 | 1.75 | 0.65 | - | - | - | - |
2 | 14.11 | 5.7 | 78.32 | 1.63 | - | 0.23 | - | - | - | - | |
3 | 19.01 | 26.55 | 51.38 | 2.76 | - | 0.31 | - | - | - | - | |
#5 | 1 | 12.02 | 55.97 | 26.55 | - | 5.77 | - | - | - | - | - |
2 | 9.5 | 55.43 | 32 | 2.15 | 2.75 | 0.17 | - | - | - | - | |
3 | 18.55 | 35.01 | 43.59 | 2.09 | 0.32 | 0.34 | - | - | 0.10 | - | |
#6 | 1 | 19.17 | 28.85 | 39.24 | - | 12.74 | - | - | - | - | - |
2 | 11.95 | 40.77 | 29.79 | 0.78 | 16.21 | 0.04 | - | - | 0.45 | - | |
3 | 18.09 | 49.97 | 28.75 | 1.55 | 1.08 | 0.29 | - | - | 0.27 | - | |
#7 | 1 | 30.58 | 43.26 | 20.06 | 1.02 | 4.56 | - | - | - | 0.52 | - |
2 | 5.47 | 51.81 | 35.04 | 2.78 | 4.26 | 0.24 | - | - | 0.40 | - | |
3 | 7.48 | 55.61 | 32.21 | 0.72 | 3.77 | - | - | - | 0.20 | - | |
#8 | 1 | 39.69 | 39.59 | 13.11 | 3.78 | 2.27 | 0.53 | - | - | - | 1.03 |
2 | 13.70 | 4.04 | 80.08 | 1.76 | - | 0.43 | - | - | - | - | |
3 | 18.65 | 7.11 | 6.34 | 37.96 | 0.47 | - | 28.67 | 0.80 | - | - | |
#9 | 1 | 9.53 | 55.25 | 19.86 | 6.31 | 1.37 | 0.73 | - | - | - | 6.94 |
2 | 40.16 | 42.67 | 10.37 | 2.45 | 0.13 | 0.17 | - | - | - | 4.04 | |
3 | 3.77 | 13.73 | 6.73 | 39.77 | - | - | 36.01 | - | - | - | |
#10 | 1 | 13.09 | 3.55 | 81.48 | 1.61 | - | 0.28 | - | - | - | - |
2 | 4.55 | 64.54 | 16.93 | 6.23 | 0.45 | 0.89 | - | - | - | 6.42 | |
3 | 16.44 | 15.49 | 10.32 | 35.06 | - | - | 21.67 | - | - | 1.03 | |
#11 | 1 | 6.18 | 61.19 | 27.40 | 1.71 | 0.41 | 0.13 | - | - | - | 2.96 |
2 | 13.63 | 8.95 | 75.09 | 1.59 | - | 0.29 | - | - | - | 0.45 | |
3 | 17.22 | 5.27 | 6.32 | 39.69 | - | - | 31.31 | - | - | 0.18 | |
#12 | 1 | 17.82 | 5.12 | 75.10 | 1.60 | - | 0.22 | - | - | - | 0.15 |
2 | 13.57 | 51.76 | 16.00 | 7.54 | - | 0.62 | - | - | - | 10.51 | |
3 | 8.91 | 62.76 | 14.42 | 5.98 | 0.34 | 0.66 | - | - | - | 6.91 | |
#13 | 1 | 8.71 | 52.67 | 33.77 | 0.13 | 4.72 | - | - | - | - | - |
2 | 15.88 | 12.37 | 70.28 | 1.23 | - | 0.25 | - | - | - | - | |
3 | 12.64 | 50.03 | 34.81 | 2.01 | 0.27 | 0.23 | - | - | - | - |
Table 2 Composition of corrosion products in the presence of Tris-HCl after immersion for 6 h.
Solutions | Spectrums | Elements (at.%) | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
C | O | Mg | Al | Cl | Zn | Mn | Si | S | P | ||
#1 | 1 | 13.45 | 56.00 | 26.91 | 1.71 | 1.69 | 0.24 | - | - | - | - |
2 | 19.69 | 38.97 | 30.21 | 10.95 | 0.08 | 0.10 | - | - | - | - | |
3 | - | 17.31 | 80.68 | 0.89 | 0.96 | 0.16 | - | - | - | - | |
#2 | 1 | 6.20 | 61.94 | 21.04 | 7.71 | 2.34 | 0.76 | - | - | - | - |
2 | 18.98 | 28.20 | 11.25 | 23.68 | 0.25 | 0.25 | 17.18 | 0.20 | - | - | |
3 | 13.28 | 42.81 | 39.30 | 2.53 | 1.76 | 0.33 | - | - | - | - | |
#3 | 1 | 16.55 | 3.04 | 78.85 | 1.35 | - | 0.21 | - | - | - | - |
2 | 13.44 | 28.77 | 49.88 | 2.37 | 5.29 | 0.25 | - | - | - | - | |
3 | 18.57 | 38.14 | 39.05 | 3.42 | 0.52 | 0.30 | - | - | - | - | |
#4 | 1 | 5.81 | 61.15 | 21.98 | 8.65 | 1.75 | 0.65 | - | - | - | - |
2 | 14.11 | 5.7 | 78.32 | 1.63 | - | 0.23 | - | - | - | - | |
3 | 19.01 | 26.55 | 51.38 | 2.76 | - | 0.31 | - | - | - | - | |
#5 | 1 | 12.02 | 55.97 | 26.55 | - | 5.77 | - | - | - | - | - |
2 | 9.5 | 55.43 | 32 | 2.15 | 2.75 | 0.17 | - | - | - | - | |
3 | 18.55 | 35.01 | 43.59 | 2.09 | 0.32 | 0.34 | - | - | 0.10 | - | |
#6 | 1 | 19.17 | 28.85 | 39.24 | - | 12.74 | - | - | - | - | - |
2 | 11.95 | 40.77 | 29.79 | 0.78 | 16.21 | 0.04 | - | - | 0.45 | - | |
3 | 18.09 | 49.97 | 28.75 | 1.55 | 1.08 | 0.29 | - | - | 0.27 | - | |
#7 | 1 | 30.58 | 43.26 | 20.06 | 1.02 | 4.56 | - | - | - | 0.52 | - |
2 | 5.47 | 51.81 | 35.04 | 2.78 | 4.26 | 0.24 | - | - | 0.40 | - | |
3 | 7.48 | 55.61 | 32.21 | 0.72 | 3.77 | - | - | - | 0.20 | - | |
#8 | 1 | 39.69 | 39.59 | 13.11 | 3.78 | 2.27 | 0.53 | - | - | - | 1.03 |
2 | 13.70 | 4.04 | 80.08 | 1.76 | - | 0.43 | - | - | - | - | |
3 | 18.65 | 7.11 | 6.34 | 37.96 | 0.47 | - | 28.67 | 0.80 | - | - | |
#9 | 1 | 9.53 | 55.25 | 19.86 | 6.31 | 1.37 | 0.73 | - | - | - | 6.94 |
2 | 40.16 | 42.67 | 10.37 | 2.45 | 0.13 | 0.17 | - | - | - | 4.04 | |
3 | 3.77 | 13.73 | 6.73 | 39.77 | - | - | 36.01 | - | - | - | |
#10 | 1 | 13.09 | 3.55 | 81.48 | 1.61 | - | 0.28 | - | - | - | - |
2 | 4.55 | 64.54 | 16.93 | 6.23 | 0.45 | 0.89 | - | - | - | 6.42 | |
3 | 16.44 | 15.49 | 10.32 | 35.06 | - | - | 21.67 | - | - | 1.03 | |
#11 | 1 | 6.18 | 61.19 | 27.40 | 1.71 | 0.41 | 0.13 | - | - | - | 2.96 |
2 | 13.63 | 8.95 | 75.09 | 1.59 | - | 0.29 | - | - | - | 0.45 | |
3 | 17.22 | 5.27 | 6.32 | 39.69 | - | - | 31.31 | - | - | 0.18 | |
#12 | 1 | 17.82 | 5.12 | 75.10 | 1.60 | - | 0.22 | - | - | - | 0.15 |
2 | 13.57 | 51.76 | 16.00 | 7.54 | - | 0.62 | - | - | - | 10.51 | |
3 | 8.91 | 62.76 | 14.42 | 5.98 | 0.34 | 0.66 | - | - | - | 6.91 | |
#13 | 1 | 8.71 | 52.67 | 33.77 | 0.13 | 4.72 | - | - | - | - | - |
2 | 15.88 | 12.37 | 70.28 | 1.23 | - | 0.25 | - | - | - | - | |
3 | 12.64 | 50.03 | 34.81 | 2.01 | 0.27 | 0.23 | - | - | - | - |
Solutions | Spectrums | Elements (at.%) | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
C | O | Mg | Al | Cl | Zn | Mn | Si | P | ||
#1′ | 1 | 14.44 | 58.92 | 23.78 | 1.02 | 1.07 | - | - | 0.78 | - |
2 | 13.37 | 51.82 | 33.59 | 0.59 | 0.63 | - | - | - | - | |
3 | 14.08 | 57.68 | 23.14 | 1.98 | 1.65 | 0.24 | - | 1.25 | - | |
#2′ | 1 | 9.32 | 45.14 | 43.08 | 1.86 | 0.31 | 0.29 | - | - | - |
2 | 19.70 | 29.99 | 8.42 | 25.62 | - | - | 15.65 | 0.62 | - | |
3 | 15.34 | 61.95 | 19.31 | 2.18 | 0.44 | 0.21 | - | 0.57 | - | |
#3′ | 1 | 16.88 | 45.30 | 32.65 | 4.94 | - | 0.23 | - | - | - |
2 | - | 22.22 | 74.98 | 2.26 | - | 0.54 | - | - | - | |
3 | 21.42 | 40.46 | 17.24 | 12.20 | - | 0.23 | 8.28 | 0.17 | - | |
#4′ | 1 | 12.49 | 60.71 | 24.57 | 0.91 | 1.32 | - | - | - | - |
2 | 17.56 | 33.97 | 46.74 | 1.51 | - | 0.22 | - | - | - | |
3 | 15.10 | 62.53 | 20.42 | 1.37 | 0.42 | 0.16 | - | - | - | |
#5′ | 1 | 14.14 | 56.31 | 28.46 | 0.50 | 0.59 | - | - | - | - |
2 | 13.02 | 26.40 | 59.74 | 0.84 | - | - | - | - | - | |
3 | 11.31 | 57.87 | 30.82 | - | - | - | - | - | - | |
#6′ | 1 | 14.21 | 50.77 | 28.24 | 2.74 | - | - | - | 4.05 | - |
2 | 18.19 | 57.36 | 19.31 | 1.74 | 1.16 | - | - | 2.24 | - | |
3 | 15.51 | 19.39 | 63.76 | 1.33 | - | - | - | - | - | |
#7′ | 1 | 24.02 | 49.35 | 23.70 | 0.96 | 0.63 | 0.07 | - | 1.27 | - |
2 | - | 38.44 | 48.57 | 3.52 | 7.98 | 0.05 | - | 1.44 | - | |
3 | 11.36 | 33.83 | 54.07 | 0.73 | - | - | - | - | - | |
#8′ | 1 | 17.46 | 45.91 | 32.08 | 1.72 | - | 0.22 | - | - | 2.60 |
2 | 21.39 | 42.70 | 19.91 | 8.67 | - | - | 4.45 | - | 2.34 | |
3 | 16.05 | 33.96 | 45.86 | 1.43 | - | 0.21 | - | - | 2.50 | |
#9′ | 1 | 16.12 | 49.35 | 32.10 | 0.79 | - | - | - | - | 1.64 |
2 | 24.24 | 32.39 | 11.92 | 15.75 | - | - | 14.28 | - | 1.43 | |
3 | 17.03 | 42.78 | 38.24 | 0.76 | - | - | - | - | 1.19 | |
#10′ | 1 | 19.86 | 45.79 | 26.48 | 1.16 | - | 0.30 | - | - | 6.41 |
2 | 16.44 | 29.96 | 49.17 | 1.32 | - | 0.24 | - | - | 2.87 | |
3 | 15.60 | 23.36 | 57.25 | 1.14 | - | 0.30 | - | - | 2.35 | |
#11′ | 1 | 16.51 | 53.30 | 26.95 | 0.71 | 0.55 | - | - | - | 1.98 |
2 | 13.63 | 52.27 | 29.66 | 1.08 | 0.81 | - | - | - | 2.54 | |
3 | 17.66 | 15.52 | 64.94 | 1.20 | - | 0.23 | - | - | 0.45 | |
#12′ | 1 | 24.08 | 44.95 | 18.43 | 1.42 | - | 0.64 | - | - | 10.47 |
2 | 16.65 | 25.16 | 29.98 | 15.72 | - | - | 9.94 | - | 2.55 | |
3 | 15.23 | 29.04 | 51.46 | 1.21 | - | 0.32 | - | - | 2.75 | |
#13′ | 1 | 20.56 | 44.24 | 22.70 | 1.08 | - | 0.70 | - | - | 10.72 |
2 | 14.45 | 28.16 | 36.53 | 10.95 | - | 0.26 | 6.52 | - | 3.13 | |
3 | 16.38 | 36.58 | 41.72 | 0.98 | - | - | - | - | 4.34 |
Table 3 Composition of corrosion products in the presence of Tris after immersion for 18 h.
Solutions | Spectrums | Elements (at.%) | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
C | O | Mg | Al | Cl | Zn | Mn | Si | P | ||
#1′ | 1 | 14.44 | 58.92 | 23.78 | 1.02 | 1.07 | - | - | 0.78 | - |
2 | 13.37 | 51.82 | 33.59 | 0.59 | 0.63 | - | - | - | - | |
3 | 14.08 | 57.68 | 23.14 | 1.98 | 1.65 | 0.24 | - | 1.25 | - | |
#2′ | 1 | 9.32 | 45.14 | 43.08 | 1.86 | 0.31 | 0.29 | - | - | - |
2 | 19.70 | 29.99 | 8.42 | 25.62 | - | - | 15.65 | 0.62 | - | |
3 | 15.34 | 61.95 | 19.31 | 2.18 | 0.44 | 0.21 | - | 0.57 | - | |
#3′ | 1 | 16.88 | 45.30 | 32.65 | 4.94 | - | 0.23 | - | - | - |
2 | - | 22.22 | 74.98 | 2.26 | - | 0.54 | - | - | - | |
3 | 21.42 | 40.46 | 17.24 | 12.20 | - | 0.23 | 8.28 | 0.17 | - | |
#4′ | 1 | 12.49 | 60.71 | 24.57 | 0.91 | 1.32 | - | - | - | - |
2 | 17.56 | 33.97 | 46.74 | 1.51 | - | 0.22 | - | - | - | |
3 | 15.10 | 62.53 | 20.42 | 1.37 | 0.42 | 0.16 | - | - | - | |
#5′ | 1 | 14.14 | 56.31 | 28.46 | 0.50 | 0.59 | - | - | - | - |
2 | 13.02 | 26.40 | 59.74 | 0.84 | - | - | - | - | - | |
3 | 11.31 | 57.87 | 30.82 | - | - | - | - | - | - | |
#6′ | 1 | 14.21 | 50.77 | 28.24 | 2.74 | - | - | - | 4.05 | - |
2 | 18.19 | 57.36 | 19.31 | 1.74 | 1.16 | - | - | 2.24 | - | |
3 | 15.51 | 19.39 | 63.76 | 1.33 | - | - | - | - | - | |
#7′ | 1 | 24.02 | 49.35 | 23.70 | 0.96 | 0.63 | 0.07 | - | 1.27 | - |
2 | - | 38.44 | 48.57 | 3.52 | 7.98 | 0.05 | - | 1.44 | - | |
3 | 11.36 | 33.83 | 54.07 | 0.73 | - | - | - | - | - | |
#8′ | 1 | 17.46 | 45.91 | 32.08 | 1.72 | - | 0.22 | - | - | 2.60 |
2 | 21.39 | 42.70 | 19.91 | 8.67 | - | - | 4.45 | - | 2.34 | |
3 | 16.05 | 33.96 | 45.86 | 1.43 | - | 0.21 | - | - | 2.50 | |
#9′ | 1 | 16.12 | 49.35 | 32.10 | 0.79 | - | - | - | - | 1.64 |
2 | 24.24 | 32.39 | 11.92 | 15.75 | - | - | 14.28 | - | 1.43 | |
3 | 17.03 | 42.78 | 38.24 | 0.76 | - | - | - | - | 1.19 | |
#10′ | 1 | 19.86 | 45.79 | 26.48 | 1.16 | - | 0.30 | - | - | 6.41 |
2 | 16.44 | 29.96 | 49.17 | 1.32 | - | 0.24 | - | - | 2.87 | |
3 | 15.60 | 23.36 | 57.25 | 1.14 | - | 0.30 | - | - | 2.35 | |
#11′ | 1 | 16.51 | 53.30 | 26.95 | 0.71 | 0.55 | - | - | - | 1.98 |
2 | 13.63 | 52.27 | 29.66 | 1.08 | 0.81 | - | - | - | 2.54 | |
3 | 17.66 | 15.52 | 64.94 | 1.20 | - | 0.23 | - | - | 0.45 | |
#12′ | 1 | 24.08 | 44.95 | 18.43 | 1.42 | - | 0.64 | - | - | 10.47 |
2 | 16.65 | 25.16 | 29.98 | 15.72 | - | - | 9.94 | - | 2.55 | |
3 | 15.23 | 29.04 | 51.46 | 1.21 | - | 0.32 | - | - | 2.75 | |
#13′ | 1 | 20.56 | 44.24 | 22.70 | 1.08 | - | 0.70 | - | - | 10.72 |
2 | 14.45 | 28.16 | 36.53 | 10.95 | - | 0.26 | 6.52 | - | 3.13 | |
3 | 16.38 | 36.58 | 41.72 | 0.98 | - | - | - | - | 4.34 |
Fig. 11. XRD patterns of AZ31 alloy in saline solution containing different anions: (a) Tris-HCl with an immersion of 6 h, (b) Tris with an immersion of 18 h.
Fig. 12. Corrosion morphologies for the samples after 2 h of immersion in solutions with the presence of Tris (a) #2′, (b) #3′ and (c) #4′; 5 h in solutions (d) #2′, (e) #3′ and (f) #4′.
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