Characterization of oxide scales formed on alloy 82 in nominal PWR primary water at 340 °C and in hydrogenated steam at 400 °C

Abstract

International audienceAlloy 82, used as weld metal in Pressurized Water Reactor (PWR), was exposed to hydrogenated steam at 400 °C and to simulated primary water at 340 °C. A comparative study of the oxide layer formed on the alloy surface in both environments was performed to confirm that steam conditions were representative of accelerated primary water conditions. For this purpose, the oxidation products were investigated at a nanometer scale using Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectrometry (XPS) and Transmission Electron Microscopy (TEM). Results obtained in both conditions are compared and the influences of heat treatment, test duration and surface preparation are studied

Corrosion of Alloy 690 in Simulated Steam Generator Crevices: Effect of Applied Potential, pH and Pb Addition

“…The quantitative interpretation of the Fe2p spectra is somewhat hindered by the interference of Auger Ni peaks, 32 however, both Fe (II) and Fe(III) valency states are clearly observed. Mo is present at the surface for oxides formed in the absence of Pb with Mo(VI) as the main constituent and Mo(V) as a secondary contribution.…”

Friction and Wear Behaviors of Fe-19Cr-15Mn-0.66N Steel at High Temperature

“…The binding energy (BE) of Fe 3+ (2p3/2) in Fe 2 O 3 and Fe 2+ (2p3/2) in Fe 3 O 4 was 711.6 eV and 709.2 eV, respectively [38,39]. The peak of metallic Fe 0 (2p3/2) was located at 706.6 eV [40]. It can be concluded from Figure 7 that Fe is mainly present in the above three forms under different conditions, with Fe 2 O 3 and Fe 3 O 4 in all cases.…”