| Science et Ingénierie des Matériaux et Procédés |  |
| Science et Ingénierie des Matériaux et Procédés | |
| HAL : hal-00674978, version 1 |
| DOI : 10.1016/j.corsci.2011.10.010 |
| Fiche détaillée |  Récupérer au format |
 |
| Corrosion Science 55 (2012) 133-139 |
|
|
|
|
| Reversible catastrophic oxidation of a 38Fe-34Ni-25Cr alloy induced by sodium sulphate at low oxygen potential atmospheres |
|
|
| L. Couture 1, 2F. Ropital |
|
|
| (2012) |
|
|
|
| The chromia-forming nickel-based alloy Haynes (R) HR-120 was oxidised with and without Na2SO4 deposit in a CO/H-2/CO2 (45/45/10%vol.) simulated process atmosphere at 900 degrees C for 96 h. During the first hours of oxidation, samples covered by sodium sulphate exhibit higher oxidation rate than non-covered ones. However, after 24 h both sulphate-covered and uncovered specimens follow the same linear kinetics. In this very low oxygen partial pressure environment (10(-18) atm), the presence of Na2SO4 promotes the growth of localized iron-rich oxide nodules leading to the observed accelerated oxidation. The development of these nodules is discussed to be the result of the chromia dissolution induced by a basic fluxing mechanism. As soon as the salt is evaporated, slower kinetics are observed and the nodules disappear. In these specific conditions, the oxidation could be considered as a self-healing process. |
|
|
|
|
|
|
|
|
|
|
|
| 1 : | IFP Energies Nouvelles (IFPEN) |
|
|
|
IFP Energies Nouvelles |
|
|
| 2 : | Science et Ingénierie des Matériaux et Procédés (SIMAP) |
|
|
|
CNRS : UMR5266 – Université Joseph Fourier - Grenoble I – Institut National Polytechnique de Grenoble (INPG) |
|
|
|
|
|
|
|
|
|
| Domaine | : | Chimie/Matériaux |
| hal-00674978, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00674978 | |
| oai:hal.archives-ouvertes.fr:hal-00674978 | |
| Contributeur : Michel Pons | |
| Soumis le : Mardi 28 Février 2012, 16:02:01 | |
| Dernière modification le : Lundi 18 Mars 2013, 10:37:03 | |
