Modeling electrochemical and metal-phase processes during alkaline aluminum corrosion

TitleModeling electrochemical and metal-phase processes during alkaline aluminum corrosion
Publication TypeJournal Article
Year of Publication2011
AuthorsHebert KR, Zhang GP, Ho KM, Wang CZ
Journal TitleElectrochimica Acta
Volume58
Pages203-208
Date Published12
Type of ArticleArticle
ISBN Number0013-4686
Accession NumberWOS:000298765300030
Keywordsalloys, Aluminum corrosion, anodic-dissolution, cracking, defects, evolution, HYDRIDE, hydrogen, hydrogen absorption, in-situ tem, induced stress, STRESS, Vacancies
Abstract

In stress corrosion cracking, the chemical pathways are not yet well-understood by which corrosion produces metal-phase defects responsible for degradation. Open-circuit dissolution of aluminum in alkaline solutions was investigated using a modeling approach, focusing on both electrochemical reactions and metal-phase processes. Pathways were identified leading to corrosion-induced tensile stress and formation of hydride, both of which can influence metal degradation processes. The model was based on the formation of vacancy-hydrogen defects during metal dissolution, and their subsequent aggregation in the metal to form hydride. Calculations successfully explained several transient measurements reported during dissolution, namely formation of subsurface voids and hydride, as well as open-circuit potential and stress. (C) 2011 Elsevier Ltd. All rights reserved.

DOI10.1016/j.electacta.2011.09.045
Alternate JournalElectrochim. Acta