Effect of CrO3 Sealing Time on Anodized A12024-T3

The effect of CrO3 sealing time on anodized aluminum alloy has been investigated. A1 2024-T3 were used as substrate. Anodizing was carried out using chromic acid. CrO3 sealing was conducted in CrO3 solution for 30, 60, 90, 120 and 150 minutes. As comparison, other specimens were also prepared as ano...

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Bibliographic Details
Published in:Journal of physics. Conference series 2016-08, Vol.739 (1)
Main Authors: Korda, Akhmad A, Hidayat, R Z
Format: Article
Language:English
Subjects:
Aluminum base alloys
Anodizing
Chromic acid
Electrolytes
Optical microscopes
Penetration
Penetration resistance
Physics
Sealing
Substrates
Thickness
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Summary:The effect of CrO3 sealing time on anodized aluminum alloy has been investigated. A1 2024-T3 were used as substrate. Anodizing was carried out using chromic acid. CrO3 sealing was conducted in CrO3 solution for 30, 60, 90, 120 and 150 minutes. As comparison, other specimens were also prepared as anodized and boiled water sealing. Thickness of the coating was observed by optical microscope. Anodized and sealing layer was analyzed by X- ray diffraction. The hardness of as anodized, boiled water sealing and CrO3 sealing were compared. The highest hardness is achieved by CrO3 sealed specimen and followed by boiled water sealing and as anodized specimens. The longer the processes of CrO3 sealing the higher layer thickness and therefore the higher hardness of the oxide layer. The best resistance to electrolyte penetration is achieved by the CrO3 sealed specimen followed by boiled water sealed and as anodized specimens. The higher thickness of oxide layer, the higher the resistance against electrolyte penetration.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/739/1/012101