Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (6): 780-796.DOI: 10.1007/s40195-018-0863-9
Special Issue: 2019年腐蚀专辑-2
• Orginal Article • Previous Articles
Yin Qi1,2, Wang Zhen-Yao1(), Liu Miao-Ran1,3, Pan Chen1
Received:
2018-09-23
Revised:
2018-11-17
Online:
2019-06-10
Published:
2019-06-17
Supported by:
Yin Qi, Wang Zhen-Yao, Liu Miao-Ran, Pan Chen. Synergistic Effect of NaCl and SO2 on the Initial Atmospheric Corrosion of Zinc Under Wet-Dry Cyclic Conditions[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(6): 780-796.
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Salts | NaCl | 3:1 | 1:1 | 1:3 | SO2 |
---|---|---|---|---|---|
NaCl Deposition rate (mg m-2 d-1) | 1170 | 877.5 | 585 | 292.5 | 0 |
NaHSO3 Deposition rate (mg m-2 d-1) | 0 | 520.5 | 1141 | 1561.5 | 2082 |
Molar deposition rate ratio | - | 3:1 | 1:1 | 1:3 | - |
Table 1 Deposition rates of the salts in each experimental group
Salts | NaCl | 3:1 | 1:1 | 1:3 | SO2 |
---|---|---|---|---|---|
NaCl Deposition rate (mg m-2 d-1) | 1170 | 877.5 | 585 | 292.5 | 0 |
NaHSO3 Deposition rate (mg m-2 d-1) | 0 | 520.5 | 1141 | 1561.5 | 2082 |
Molar deposition rate ratio | - | 3:1 | 1:1 | 1:3 | - |
Groups | Corrosion products |
---|---|
NaCl | Zn5(OH)8Cl2·H2O Zn(OH)2 Zn5(CO3)2(OH)6 |
3:1 | NaZn4SO4(OH)6Cl·6H2O Zn5(OH)8Cl2·H2O Zn(OH)2 Zn5(CO3)2(OH)6 |
1:1 | NaZn4SO4(OH)6Cl·6H2O Zn(OH)2 Zn5(CO3)2(OH)6 |
1:3 | NaZn4SO4Cl(OH)6·6H2O Na2Zn(SO4)2·4H2Oa Zn5(CO3)2(OH)6 |
SO2 | Na2Zn(SO4)2·4H2Oa ZnSO4·H2Oa Zn4SO4(OH)6·H2O |
Table 2 Corrosion products detected by XRD and FTIR on the corroded zinc samples
Groups | Corrosion products |
---|---|
NaCl | Zn5(OH)8Cl2·H2O Zn(OH)2 Zn5(CO3)2(OH)6 |
3:1 | NaZn4SO4(OH)6Cl·6H2O Zn5(OH)8Cl2·H2O Zn(OH)2 Zn5(CO3)2(OH)6 |
1:1 | NaZn4SO4(OH)6Cl·6H2O Zn(OH)2 Zn5(CO3)2(OH)6 |
1:3 | NaZn4SO4Cl(OH)6·6H2O Na2Zn(SO4)2·4H2Oa Zn5(CO3)2(OH)6 |
SO2 | Na2Zn(SO4)2·4H2Oa ZnSO4·H2Oa Zn4SO4(OH)6·H2O |
Fig. 5 Surface morphologies of the zinc samples after removal of the corrosion products: a, b Group NaCl; c, d Group 3:1; e, f Group 1:1; g, h Group 1:3; i, j Group SO2
Points | Zn (at%) | O (at%) | Cl (at%) | S (at%) |
---|---|---|---|---|
A | 15.4 | 81.8 | 2.80 | - |
B | 29.9 | 56.3 | 13.8 | - |
C | 27.2 | 72.2 | 0.540 | - |
D | 30.3 | 64.6 | 5.08 | - |
E | 7.31 | 79.7 | - | 13.0 |
F | 28.2 | 66.6 | - | 5.21 |
G | 28.7 | 63.7 | - | 7.60 |
Table 3 Element composition of the points marked in Figs. 6 and 7 examined by EDS
Points | Zn (at%) | O (at%) | Cl (at%) | S (at%) |
---|---|---|---|---|
A | 15.4 | 81.8 | 2.80 | - |
B | 29.9 | 56.3 | 13.8 | - |
C | 27.2 | 72.2 | 0.540 | - |
D | 30.3 | 64.6 | 5.08 | - |
E | 7.31 | 79.7 | - | 13.0 |
F | 28.2 | 66.6 | - | 5.21 |
G | 28.7 | 63.7 | - | 7.60 |
Points | Zn (at%) | O (at%) | Cl (at%) | S (at%) |
---|---|---|---|---|
A | 15.7 | 74.6 | 4.87 | 4.79 |
B | 24.2 | 64.5 | 9.75 | 1.62 |
C | 16.4 | 73.4 | 4.88 | 5.34 |
D | 17.4 | 81.3 | 0.310 | 1.03 |
E | 7.20 | 78.8 | - | 14.0 |
F | 19.2 | 69.7 | 5.09 | 5.95 |
Table 4 Element composition of the points marked in Fig. 8 examined by EDS
Points | Zn (at%) | O (at%) | Cl (at%) | S (at%) |
---|---|---|---|---|
A | 15.7 | 74.6 | 4.87 | 4.79 |
B | 24.2 | 64.5 | 9.75 | 1.62 |
C | 16.4 | 73.4 | 4.88 | 5.34 |
D | 17.4 | 81.3 | 0.310 | 1.03 |
E | 7.20 | 78.8 | - | 14.0 |
F | 19.2 | 69.7 | 5.09 | 5.95 |
Compounds | Zn (at%) | O (at%) | Cl (at%) | S (at%) |
---|---|---|---|---|
Zn5(OH)8Cl2·H2O | 31.2 | 56.2 | 12.5 | - |
NaZn4SO4(OH)6Cl·6H2O | 18.2 | 72.7 | 4.54 | 4.54 |
Zn4SO4(OH)6·5H2O | 20.0 | 75.0 | - | 5.00 |
Na2Zn(SO4)2·4H2O | 6.67 | 80.0 | - | 13.3 |
ZnSO4·H2O | 14.3 | 71.4 | - | 14.3 |
Table 5 Element composition of zinc corrosion products
Compounds | Zn (at%) | O (at%) | Cl (at%) | S (at%) |
---|---|---|---|---|
Zn5(OH)8Cl2·H2O | 31.2 | 56.2 | 12.5 | - |
NaZn4SO4(OH)6Cl·6H2O | 18.2 | 72.7 | 4.54 | 4.54 |
Zn4SO4(OH)6·5H2O | 20.0 | 75.0 | - | 5.00 |
Na2Zn(SO4)2·4H2O | 6.67 | 80.0 | - | 13.3 |
ZnSO4·H2O | 14.3 | 71.4 | - | 14.3 |
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