| Title | Quantification of the chemical reactivity of molten nitrate salts with heat treatable aluminum alloys |
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| Author | Harvey, J-P; Singh, S; Oishi, K; Acheson, B; Turcotte, R; Pilon, D; Lavoie, J; Grange, B |
| Source | Materials and Design vol. 198, 109293, 2020 p. 1-12, https://doi.org/10.1016/j.matdes.2020.109293  Open Access |
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| Year | 2020 |
| Alt Series | Natural Resources Canada, Contribution Series 20200596 |
| Publisher | Elsevier Ltd. |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf; html |
| Subjects | Science and Technology; industrial minerals; lithium; sodium; nitrate; magnesium |
| Illustrations | diagrams; graphs; tables |
| Released | 2020 11 05 |
| Abstract | This work explores the conditions for safe heat treatment of aluminum alloys containing lithium and magnesium in molten sodium nitrate (NaNO3) bath furnaces, and conditions where industrial accidents
may occur. Using calorimetry coupled to classical thermodynamics, the strength of classical thermodynamics when analyzing thermal curves was demonstrated through a series of small-scale thermal analyses of various aluminum alloys in contact with
sodium nitrate. This system was selected to illustrate reactions that may lead to severe and violent heat effect phenomena. Using idealized binary alloys, severe oxidation of magnesium- and lithium-rich aluminum alloy samples were shown to occur near
500 °C, a temperature range dangerously close to the operating temperature of solution heat treatment furnaces in manufacturing processes of heat treatable aluminum alloy sheets used in the aerospace industry. Commercial aluminum alloys AW257, 2198,
2024, and 1050 were also assessed with the same tools. The temperature that needed to be reached for these commercial aluminum alloys to react with molten sodium nitrate was significantly higher than the normal operating temperature of a conventional
solution heat treatment furnace. |
| GEOSCAN ID | 327860 |
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