Abstract
The under-deposit corrosion behavior of Alloy 800 and Alloy 825 in oxidizing supercritical water (SCW) containing KCl or NaCl were investigated. A novel-designed reactor was used to ensure that the alloys remained covered by salt deposits in the whole immersion test process. Fe oxides, NiCl2, and spinel structures were detected on the outer layer, Cr2O3 formed as the inner layer. The salt deposits block the diffusion of oxygen into the microenvironment between the alloy surface and the salt deposit layer. A detailed under-deposit corrosion mechanism of the alloys after exposure to oxidizing supercritical water is proposed.
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