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- Title
Failure Analysis of Leakage in the Decomposition Tank of Bayer Process for Producing Alumina.
- Authors
Wei, Yuwei; Ju, Chengwei; Huang, Qinghua; Du, Liang; Zhong, Linzhi; Zheng, Yunqin; Yao, Yangming; Tao, Jiahao; Wang, Zhipeng; Liu, Xi; Wu, Weiying
- Abstract
A large batch of cracks appeared in and around the welds of alumina-decomposition tank used in production of alumina by Bayer process. The crack morphology and metallographic structure were analyzed by means of SEM, EDS and optical microscope. As a crack source, pores expanded along grain boundaries and pearlite under the promotion of stresses to form final cracks in alkaline environment, resulting in leakage. The multi-stress cracking mechanism in alkaline environment is strain induced-anodic dissolution. IGPSCC (intergranular pearlitic stress corrosion crack) electrochemical corrosion model for alkali embrittlement of thick wall tank welds is established, which provides a reference for the study of weld cracking in alumina-decomposition tank after long-term operation.
- Subjects
BAYER process; ELECTROLYTIC corrosion; FAILURE analysis; OPTICAL microscopes; CRYSTAL grain boundaries
- Publication
Journal of Failure Analysis & Prevention, 2024, Vol 24, Issue 4, p1689
- ISSN
1547-7029
- Publication type
Article
- DOI
10.1007/s11668-024-01949-z