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Stresses in sulfuric acid anodized coatings on aluminumStresses in porous anodic alumina coatings have been measured for specimens stabilized in air at different temperatures and humidities. In ambient atmosphere the stress is tensile after anodic oxidation and is compressive after sealing. Exposure to dry atmosphere causes the stress to change to strongly tensile, up to 110 MPa. The stress increase is proportional to the loss of water from the coating. These changes are reversible with changes in humidity. Similar reversible effects occur upon moderate temperature changes. The biaxial modulus of the coating is about 100 GPa.
Document ID
19930057874
Document Type
Reprint (Version printed in journal)
Authors
Alwitt, R. S. (NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Xu, J. (Boundary Technologies, Inc. Buffalo Grove, IL, United States)
Mcclung, R. C. (Southwest Research Inst. San Antonio, TX, United States)
Date Acquired
August 16, 2013
Publication Date
May 1, 1993
Publication Information
Publication: Electrochemical Society, Journal
Volume: 140
Issue: 5
ISSN: 0013-4651
Subject Category
NONMETALLIC MATERIALS
Funding Number(s)
CONTRACT_GRANT: NAS9-18350
CONTRACT_GRANT: NAS9-18087
Distribution Limits
Public
Copyright
Other