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The relation between the corrosion rate and properties of oxides on iron formed in initial immersion stage was investigated by monitoring corrosion potential (Ecorr) and corrosion resis tance(Rp) in deaerated 5 mol.m-3 Na2SO4 solutions of 473 to 588K. In order to understand electrochemical properties of the oxides, the reactivity of them to cathodic reduction of O2 also was investigated at room temperature in addition to identification of the oxides. Analyses of iron oxides with X-ray diffraction, laser Raman spectroscopy and SEM showed only magnetite formation, independent of exposure temperature. The temperature dependency of Rp was found to change below and above the exposure temperature of 548-573 K. This temperature depen dencywas maintained in the measurement at room temperature in absence of O2, whilst being disappeared as changed the atmosphere to O2. Along with the behaviors in Ecorr and the O2 cathodic reduction, it was considered that the corrosion rate of iron in deaerated high tempera turewater was markedly dependent of the morphology of the inner oxide layer formed in the initial stage, which being characterized by pore distribution. Further, the corrosion rate below 548-573 K was discussed in terms of diffusion processes of Fee, FeOH+ and H2O through the micropores of inner oxide layer.

Corrosion Rate of Iron in Deaerated High Temperature Solution