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High-temperature corrosion behavior of BaCeO3 in Na2SO4+V2O5 salt mixture

High-temperature corrosion behavior of BaCeO3 in Na2SO4+V2O5 salt mixture

Authors :
P.V. Sachin Raj
S.P. Kumaresh Babu
Source :
Next Materials, Vol 7, Iss , Pp 100374- (2025)
Publication Year :
2025
Publisher :
Elsevier, 2025.

Abstract

This study examines the high temperature corrosion response and thermal barrier characteristics of BaCeO3. The phase stability and decomposition behaviour of BaCeO3 were studied using TG-DSC analysis. The thermal diffusivity and thermal expansion coefficient were determined using Laser Flash Analysis and Dilatometry techniques. Microhardness of the sintered BaCeO3 was measured using Vickers micro indentation technique whereas the elastic modulus was found using Ultrasonic technique. Corrosion tests were performed on both BaCeO3 coatings and pellet samples in 32 wt% Na2SO4 + 68 wt% V2O5 salt melt at 900ºC, and the corrosion process was analyzed using XRD and SEM-EDS. The main corrosion product found in the samples exposed to 32 wt% Na2SO4 + 68 wt% V2O5 mixture was Ba3V2O8, with small amounts of CeO2 and BaSO4. SEM-EDS examination of the corroded samples highlighted the significant corrosive action on BaCeO3, indicating the acidic leaching of Ba2+ ions, which then reacted with the salt mixture. The formation of NaVO3 intensified atomic mobility, aggravating the corrosion process. Comparing the hot corrosion of BaCeO3 in pure Na2SO4 and V2O5 melts with that in the 32 wt% Na2SO4 + 68 wt% V2O5 mixture confirmed this effect. No discernible peaks corresponding to any Ce-V-O compound were observed in any of the corrosion patterns, suggesting a preference for BaO over CeO2 in the corrosion process due to its stronger basic nature.

Details

Language :
English
ISSN :
29498228
Volume :
7
Issue :
100374-
Database :
Directory of Open Access Journals
Journal :
Next Materials
Publication Type :
Academic Journal
Accession number :
edsdoj.9e6c2adde0434170920d0c6f9082da65
Document Type :
article
Full Text :
https://doi.org/10.1016/j.nxmate.2024.100374