Abstract
Corrosion tests of Inconel 600 and Incoloy 825 were performed in supercritical water containing sulfides at 520 °C and 25 MPa. The scales formed on Inconel 600 consisted of a thick outer layer of almost pure Ni3S2 and an inner layer predominantly of Cr-rich spinels with a Ni3S2 network inside. The scales of Incoloy 825 also had a multilayered structure. The outer layer primarily consisted of Ni3S2 and (Ni,Fe)3S4, followed by a thicker intermediate mixture layer of chromium-rich oxides, Ni3S2, and (Ni,Fe)3S4, an inner layer of predominantly Cr2O3 and a small amount of Ni3S2 toward the substrate. Incoloy 825 showed slightly better corrosion resistance than Inconel 600 due to its higher Cr content. By means of superimposed isothermal phase diagrams and evaluation for the partial pressures of oxygen and sulfur in the designated atmosphere, the corresponding corrosion mechanisms were discussed, based on the present investigation.
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This work was financially supported by the Twelfth Five-Year Chinese National Science and Technology Support Programme (2011BAK06B04).
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Li, Y., Wang, S., Tang, X. et al. Effects of Sulfides on the Corrosion Behavior of Inconel 600 and Incoloy 825 in Supercritical Water. Oxid Met 84, 509–526 (2015). https://doi.org/10.1007/s11085-015-9567-y
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DOI: https://doi.org/10.1007/s11085-015-9567-y