Acta Metallurgica Sinica (English Letters) ›› 2015, Vol. 28 ›› Issue (7): 866-875.DOI: 10.1007/s40195-015-0270-4
• Orginal Article • Previous Articles Next Articles
Lin Fan1,2, Zhi-Yong Liu1(), Wei-Min Guo2, Jian Hou2, Cui-Wei Du1, Xiao-Gang Li1
Received:
2014-09-19
Revised:
2014-12-31
Online:
2015-04-28
Published:
2015-07-23
Lin Fan, Zhi-Yong Liu, Wei-Min Guo, Jian Hou, Cui-Wei Du, Xiao-Gang Li. A New Understanding of Stress Corrosion Cracking Mechanism of X80 Pipeline Steel at Passive Potential in High-pH Solutions[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(7): 866-875.
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Fig. 1 Stress-strain curves of X80 pipeline steel in air and in 0.05 mol/L Na2CO3 + 0.10 mol/L NaHCO3 solutions with different concentrations of chloride ion at -200 mV versus SCE
Fig. 3 Morphologies of fracture surfaces a, c and lateral surfaces b, d in 0.05 mol/L Na2CO3 + 0.10 mol/L NaHCO3 solutions without chloride ion a, b, with 0.10 mol/L chloride ion c, d
Fig. 4 Stress-strain curves of X80 pipeline steel in air and in 0.15 mol/L Na2CO3/NaHCO3 + 0.10 mol/L NaCl solutions with different pH at -200 mV versus SCE
Fig. 6 Morphologies of fracture surfaces a, d and lateral surfaces b, c in 0.15 mol/L Na2CO3/NaHCO3 + 0.10 mol/L NaCl solutions with pH = 8.31 a-c, pH = 11.64 d
Fig. 7 Polarization curves of X80 steel at sweep rates of 1 mV/s a, c and 100 mV/s b, d in the solutions with different chloride ion concentrations a, b and pH c, d
Fig. 9 EIS results of X80 steel in the solutions with different concentrations of chloride ion a and different pH b; inset is the magnification for pH = 8.31
Fig. 10 Equivalent circuits corresponding to the EIS results in the solutions with different chloride ion concentrations or with pH higher than 9.62 a and in the solutions with a pH value of 8.31 b
Fitting data (Ω cm2) | Chloride ion concentration (mol L-1) | pH | ||||||
---|---|---|---|---|---|---|---|---|
0 | 0.01 | 0.05 | 0.10 | 8.31 | 9.62 | 10.64 | 11.55 | |
R ct | 375 | 363.8 | 289.5 | 221.9 | 922.4 | 221.9 | 310.7 | 555.9 |
R po | 1997.9 | 1286 | 1124 | 940 | - | 940 | 4113 | 11,770 |
R p | 2372.9 | 1649.8 | 1413.5 | 1161.9 | 922.4 | 1161.9 | 4423.7 | 12,325.9 |
Table 1 Fitting data of R ct, R po, and R p
Fitting data (Ω cm2) | Chloride ion concentration (mol L-1) | pH | ||||||
---|---|---|---|---|---|---|---|---|
0 | 0.01 | 0.05 | 0.10 | 8.31 | 9.62 | 10.64 | 11.55 | |
R ct | 375 | 363.8 | 289.5 | 221.9 | 922.4 | 221.9 | 310.7 | 555.9 |
R po | 1997.9 | 1286 | 1124 | 940 | - | 940 | 4113 | 11,770 |
R p | 2372.9 | 1649.8 | 1413.5 | 1161.9 | 922.4 | 1161.9 | 4423.7 | 12,325.9 |
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