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Near-neutral pH corrosion of mill-scaled X-65 pipeline steel with paint primer
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Shidong Wang, Lyndon Lamborn, Karina Chevil, Erwin Gamboa, Weixing Chen
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Table 6 Possible electrode reactions and corresponding expressions for their equilibrium potential used in the currently investigation (pH = 6.29, [Fe2+] = 10-6 mol/l).
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| No. | Electrode reaction | Equilibrium potential equation | E (V/SCE) | | (8) | Fe→Fe2++2e- | EFe2+/Fe=-0.6527+0.0296log[Fe2+] | -0.830 | | (9) | γFeOOH+3H++e-→Fe2++2H2O | EγFeOOH/ Fe2+=0.5136-0.0592log[Fe2+]-0.178pH | -0.251 | | (10) | αFeOOH+3H++e-→Fe2++2H2O | EαFeOOH/ Fe2+=0.4597-0.0592log[Fe2+]-0.178pH | -0.305 | | (11) | Fe3O4+8H++2e-→3Fe2++4H2O | EFe3O4/Fe2+=0.6364-0.0888log[Fe2+]-0.237pH | -0.322 | | (12) | 2H++2e-→H2 | EH+/H2=-0.2438-0.0592pH | -0.616 |
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