Abstract
The corrosion kinetics of zircaloy-2 in water and steam at temperatures between 300 deg. C and 400 deg. C are represented by a curve sharply divided into two stages separated by a so-called transition point. After a first period of decreasing corrosion rate there follows a second period with much faster kinetics in which the speed is constant. After carrying out a methodical study of the corrosion of 'zircaloy-2 in the form of sheets and tubes. We have demonstrated, at 400 deg. C in steam, a systematic anomaly which appears at the transition point. The curve presents three quite distinct points; after the first period a fast corrosion is observed, followed by a third period at a slower speed. This leads us to believe that there may be not a single point but a transition zone, separating two types of kinetic behaviour and corresponding to modifications in the properties of the oxide layer. After this readjustment period a new corrosion law is established, lasting a considerable time, the corrosion speed being slower than that indicated so far. A study of the morphology of the oxide films which develop under these conditions has demonstrated the special part played by mechanical, physical
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Coriou, H;
Gauduchau, J;
Grall, L;
Hure, J;
Pelras, M
[1]
- Commissariat a l'Energie Atomique, Saclay (France).Centre d'Etudes Nucleaires
Citation Formats
Coriou, H, Gauduchau, J, Grall, L, Hure, J, and Pelras, M.
Contribution to the study of corrosion of zirconium and zircaloy-2 in superheated steam at 400 deg C (105 kg /cm{sup 2}); Contribution a l'etude de la corrosion du zirconium et du zircaloy-2 dans la vapeur d'eau surchauffee a 400 deg C (105 kg /cm{sup 2}).
France: N. p.,
1959.
Web.
Coriou, H, Gauduchau, J, Grall, L, Hure, J, & Pelras, M.
Contribution to the study of corrosion of zirconium and zircaloy-2 in superheated steam at 400 deg C (105 kg /cm{sup 2}); Contribution a l'etude de la corrosion du zirconium et du zircaloy-2 dans la vapeur d'eau surchauffee a 400 deg C (105 kg /cm{sup 2}).
France.
Coriou, H, Gauduchau, J, Grall, L, Hure, J, and Pelras, M.
1959.
"Contribution to the study of corrosion of zirconium and zircaloy-2 in superheated steam at 400 deg C (105 kg /cm{sup 2}); Contribution a l'etude de la corrosion du zirconium et du zircaloy-2 dans la vapeur d'eau surchauffee a 400 deg C (105 kg /cm{sup 2})."
France.
@misc{etde_20942986,
title = {Contribution to the study of corrosion of zirconium and zircaloy-2 in superheated steam at 400 deg C (105 kg /cm{sup 2}); Contribution a l'etude de la corrosion du zirconium et du zircaloy-2 dans la vapeur d'eau surchauffee a 400 deg C (105 kg /cm{sup 2})}
author = {Coriou, H, Gauduchau, J, Grall, L, Hure, J, and Pelras, M}
abstractNote = {The corrosion kinetics of zircaloy-2 in water and steam at temperatures between 300 deg. C and 400 deg. C are represented by a curve sharply divided into two stages separated by a so-called transition point. After a first period of decreasing corrosion rate there follows a second period with much faster kinetics in which the speed is constant. After carrying out a methodical study of the corrosion of 'zircaloy-2 in the form of sheets and tubes. We have demonstrated, at 400 deg. C in steam, a systematic anomaly which appears at the transition point. The curve presents three quite distinct points; after the first period a fast corrosion is observed, followed by a third period at a slower speed. This leads us to believe that there may be not a single point but a transition zone, separating two types of kinetic behaviour and corresponding to modifications in the properties of the oxide layer. After this readjustment period a new corrosion law is established, lasting a considerable time, the corrosion speed being slower than that indicated so far. A study of the morphology of the oxide films which develop under these conditions has demonstrated the special part played by mechanical, physical and metallurgical factors in the case of zirconium. Deep penetration of oxide can thus show up on the inner wall of hammer-hardened tubes. Simultaneously a very considerable hydride formation occurs in the metal. (author) [French] La cinetique de corrosion du zircaloy-2 dans l'eau et la vapeur a des temperatures comprises entre 300 et 400 deg. C est representee par une courbe a deux periodes separees par un point singulier appele point de transition. A une premiere periode a vitesse de corrosion decroissante, succede une deuxieme periode a cinetique beaucoup plus rapide dont la vitesse est constante. Apres une etude systematique de la corrosion du zircaloy-2 sous forme de toles et de tubes, nous avons mis en evidence a 400 deg. C, dans la vapeur, une anomalie systematique qui se produit au point de transition. La courbe presente trois parties bien distinctes a la fin de la premiere periode, on observe une corrosion a vitesse importante, suivie par une troisieme periode a vitesse plus faible. Nous serions donc amenes a penser qu'il peut y avoir non un point, mais une zone de transition separant deux cinetiques et correspondant a des modifications de proprietes de la couche d'oxyde. Apres cette periode de rearrangement, on obtient une nouvelle loi de corrosion qui se poursuit jusqu'a des durees importantes, la vitesse de corrosion etant plus faible que celle qui a ete indiquee jusqu'ici. Une etude de la morphologie des films d'oxyde developpes dans ces conditions a permis de mettre en evidence le role particulier que peuvent jouer dans le cas du zirconium les facteurs mecaniques, physiques et metallurgiques. Des penetrations profondes de l'oxyde peuvent ainsi se manifester sur la paroi interne de tubes ecrouis. Simultanement, il se produit une hydruration tres importante du metal. (auteur)}
place = {France}
year = {1959}
month = {Jul}
}
title = {Contribution to the study of corrosion of zirconium and zircaloy-2 in superheated steam at 400 deg C (105 kg /cm{sup 2}); Contribution a l'etude de la corrosion du zirconium et du zircaloy-2 dans la vapeur d'eau surchauffee a 400 deg C (105 kg /cm{sup 2})}
author = {Coriou, H, Gauduchau, J, Grall, L, Hure, J, and Pelras, M}
abstractNote = {The corrosion kinetics of zircaloy-2 in water and steam at temperatures between 300 deg. C and 400 deg. C are represented by a curve sharply divided into two stages separated by a so-called transition point. After a first period of decreasing corrosion rate there follows a second period with much faster kinetics in which the speed is constant. After carrying out a methodical study of the corrosion of 'zircaloy-2 in the form of sheets and tubes. We have demonstrated, at 400 deg. C in steam, a systematic anomaly which appears at the transition point. The curve presents three quite distinct points; after the first period a fast corrosion is observed, followed by a third period at a slower speed. This leads us to believe that there may be not a single point but a transition zone, separating two types of kinetic behaviour and corresponding to modifications in the properties of the oxide layer. After this readjustment period a new corrosion law is established, lasting a considerable time, the corrosion speed being slower than that indicated so far. A study of the morphology of the oxide films which develop under these conditions has demonstrated the special part played by mechanical, physical and metallurgical factors in the case of zirconium. Deep penetration of oxide can thus show up on the inner wall of hammer-hardened tubes. Simultaneously a very considerable hydride formation occurs in the metal. (author) [French] La cinetique de corrosion du zircaloy-2 dans l'eau et la vapeur a des temperatures comprises entre 300 et 400 deg. C est representee par une courbe a deux periodes separees par un point singulier appele point de transition. A une premiere periode a vitesse de corrosion decroissante, succede une deuxieme periode a cinetique beaucoup plus rapide dont la vitesse est constante. Apres une etude systematique de la corrosion du zircaloy-2 sous forme de toles et de tubes, nous avons mis en evidence a 400 deg. C, dans la vapeur, une anomalie systematique qui se produit au point de transition. La courbe presente trois parties bien distinctes a la fin de la premiere periode, on observe une corrosion a vitesse importante, suivie par une troisieme periode a vitesse plus faible. Nous serions donc amenes a penser qu'il peut y avoir non un point, mais une zone de transition separant deux cinetiques et correspondant a des modifications de proprietes de la couche d'oxyde. Apres cette periode de rearrangement, on obtient une nouvelle loi de corrosion qui se poursuit jusqu'a des durees importantes, la vitesse de corrosion etant plus faible que celle qui a ete indiquee jusqu'ici. Une etude de la morphologie des films d'oxyde developpes dans ces conditions a permis de mettre en evidence le role particulier que peuvent jouer dans le cas du zirconium les facteurs mecaniques, physiques et metallurgiques. Des penetrations profondes de l'oxyde peuvent ainsi se manifester sur la paroi interne de tubes ecrouis. Simultanement, il se produit une hydruration tres importante du metal. (auteur)}
place = {France}
year = {1959}
month = {Jul}
}