O. Brucelle, J.G. Spilmont
The oxidation kinetics of alloy 718 in primary water of PWR is studied through static autoclave immersion. SIMS measurements of the global oxide scale thickness versus immersion time show that the oxidation kinetics obeys a parabolic law with kp » 10"19 mV1 at 300 °C. This kinetics is shown to be accelerated by a temperature increase or a more rough specimen surface but remains unchanged by a variation in hydrogen partial pressure. The role of preoxidation in air and in the autoclave is also studied. The results show that hydrogen penetrating the alloy arises from the oxidation process itself. It is deduced that corrosion occurs through the formation of a duplex oxide scale formed by the activation of two parallel oxidation reactions localized at the metal-oxide and the oxide-water interfaces respectively. The anodic reaction, that takes place at the inner interface is responsible for the hydrogen charging. The present paper aims to study the mechanisms operating during the general corrosion of the alloy under conditions simulating the use of the alloy in PWR, with particular emphasis on the examination of the correlation between oxide growth and hydrogen penetration.
@article{ee5cfa20-0fa7-4017-9ad0-a1ed3b06dd92,
title={A STUDY OF CORROSION MECHANISMS AND KINETICS OF ALLOY 718 IN PWR PRIMARY WATER.},
author={O. Brucelle and J.G. Spilmont},
year={2023},
language={en}
}TY - JOUR TI - A STUDY OF CORROSION MECHANISMS AND KINETICS OF ALLOY 718 IN PWR PRIMARY WATER. AU - O. Brucelle AU - J.G. Spilmont PY - 2023 LA - en ER -
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