Evaluating the Corrosion Behaviour of Copper during Deliquescent Drying/Wetting Cycles in Humid Air
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Résumé
Copper and its alloys are highly valued for their moldability, heat/electricity conduction, and corrosion resistance, making them widely used in various industrial applications. One potential application of copper is as the corrosion barrier for used nuclear fuel containers (UFCs) within a deep geological repository (DGR) in Canada, Sweden and Finland. The UFC's copper surface will be exposed to different conditions in the evolving DGR environment, which will transition from warm, dry, and oxic to cool, wet, and anoxic conditions. Deliquescence is a known process in forming the initial corrosive solutions/droplets that may occur as a result of adsorption of moisture by salt particles at the UFC surface during the unsaturated phase in a DGR. The duration over which the surface will remain wet under oxic condition will impact the extent of copper corrosion. To investigate this phenomenon, the quartz crystal microbalance (QCM) technique was used. The QCM consists of a quartz plate, covered by gold electrodes on both sides onto which a layer of copper is deposited using e-beam deposition. In this technique, the change in the resonance frequency of a vibrating quartz crystal is linearly proportional to the change in mass on the crystal's surface (Δm) under certain conditions with a sensitivity in the nanogram range. In this study this effect was used to monitor the adsorption and evaporation of water, the salt depletion, and to quantify the extent of atmospheric corrosion on copper surfaces. To systematically study the atmospheric corrosion of copper surfaces, controlled amounts of different salts (NaCl, CaCl 2 , and MgCl 2 ) were loaded onto copper-coated QCM crystals using an inkjet printer, and then corrosion tests were performed at different relative humidity (RH) values depending on the deliquescence relative humidity (DRH) of each salt at 75 °C. Results revealed that for NaCl, the surface remained continuously wet above its DRH (75% RH). However, for CaCl 2 , the time of wetness was relatively short post-deliquescence. Corrosion continued beyond this wet period, eventually depleting all the salt and forming non-deliquescent products. Higher RH levels prolonged the wetness period and accelerated the salt depletion, leading to a stabilized corrosion rate comparable to that of bare copper under similar conditions. Similarly for MgCl 2 , the time of wetness was also limited, and higher RH extended the wetness duration. Interestingly, corrosion rates differed from those observed with CaCl 2 . Surface analysis techniques, including focused ion beam (FIB) cutting and energy dispersive X-ray spectroscopy (EDS), were used to examine the composition and structure of corrosion films for CaCl 2 , providing insights into the underlying corrosion mechanisms. Further analyses are ongoing for both CaCl 2 and MgCl 2 to better understand their distinct corrosion behaviours.
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Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
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