 |
Journal articles
Single Crystal and Sintered Alumina Corrosion in Liquid Sodium
Abstract : Corrosion tests were conducted under static conditions at 450 and 550 DC for various oxygen contents and durations with single crystal and sintered alumina regarded as model materials for ceramics. Extremely pure and dense sintered alumina exhibited no intergranular corrosion and identical behavior as single crystal. Corrosion appeared to proceed by reaction of Al$_2$O$_3$ with dissolved oxygen (Na$_2$O) to form sodium aluminate (NaAlO$_2$). Then, sodium aluminate was dissolved in liquid sodium by a mechanism that is still to be elucidated. The corrosion morphology was equivalent to dissolution. From weight loss measurement, linear kinetics were found with a constant dissolution rate of (61 ± 2)10$^{−4}$mg dm$^{−2}$ h$^{−1}$ at 550 DC and low oxygen content (<1 ppm). No significant corrosion rate could be measured at 450 DC and low oxygen content. An order reaction kinetics with respect to dissolved oxygen content of 0.6 ± 0.2 was found.
Cited literature [16 references]
https://hal-cea.archives-ouvertes.fr/cea-02388860
Contributor : Jean-Louis Courouau Connect in order to contact the contributor
Submitted on : Wednesday, June 17, 2020 - 2:42:30 PM
Last modification on : Tuesday, October 19, 2021 - 11:30:48 AM
Contributor : Jean-Louis Courouau Connect in order to contact the contributor
Submitted on : Wednesday, June 17, 2020 - 2:42:30 PM
Last modification on : Tuesday, October 19, 2021 - 11:30:48 AM
File
Post print - courouau 2017.pdf
Files produced by the author(s)