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- W3136309235 abstract "In France and other countries, carbon and low alloy steels have been proposed as suitable materials for nuclear waste containers for long term geological disposal since, for such types of steels, general and localised corrosion can be fairly well predicted in geological environments (mainly argillaceous and granitic conditions) during the initial oxic and the following anoxic stages. This paper presents a model developed for the long term estimation of general and localised corrosion of carbon steel in argillaceous and granitic environments. In the case of localised corrosion, the model assumes that pitting and crevice corrosion propagation rates are similar. The estimations are based on numerous data coming from various experimental programmes conducted by the following laboratories: UKAEA (United Kingdom); NAGRA (Switzerland); SCK-CEN (Belgium); JNC (Japan) and ANDRA-CEA-EDF (France). From these data, the corrosion rates measured over long periods (from six months to several years) and derived from mass loss measurements have been selected to construct the proposed models. For general corrosion, the model takes into account an activation energy deduced from the experimental results (Arrhenius law) and proposes three equations for the corrosion rate: one for the oxic conditions, one for the early stage of the anoxic conditions and one for the long term anoxic corrosion. Concerning localised corrosion, a semi-empirical model, based on the evolution of the pitting factor (ratio between the maximum pit depth and the average general corrosion depth) as a function of the general corrosion depth, is proposed. This model is compared to other approaches where the maximum pit depth is directly calculated as a function of time, temperature and oxic or anoxic conditions. Finally, the presented semi-empirical models for long term corrosion estimation are applied to the case of nuclear waste storage. The results obtained by the different methods are then discussed and compared with other predictions. (authors)" @default.
- W3136309235 created "2021-03-29" @default.
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- W3136309235 date "2003-07-01" @default.
- W3136309235 modified "2023-09-25" @default.
- W3136309235 title "Semi-empirical model for carbon steel corrosion in long term geological nuclear waste disposal" @default.
- W3136309235 hasPublicationYear "2003" @default.
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