The Effect of Post-Treatment Time and Temperature on Cerium-Based Conversion Coatings on Al 2024-T3
Abstract
Corrosion performance, morphology, and electrochemical characteristics of cerium-based conversion coatings on Al 2024-T3 were examined as a function of phosphate post-treatment time and temperature. Corrosion resistance improved after post-treatment in 2.5 wt.% NH4H2PO4 for times up to 10 min or temperatures up to 85 °C. Electrochemical impedance spectroscopy and polarization testing correlated to neutral salt spray corrosion performance. Hydrated cerium oxide and peroxide species present in the as-deposited coatings were transformed to CePO4·H2O for post-treatments at longer times and/or higher temperatures. Based on these results, processes active during post-treatment are kinetically dependent and strongly influenced by the post-treatment time and temperature.
Recommended Citation
D. K. Heller et al., "The Effect of Post-Treatment Time and Temperature on Cerium-Based Conversion Coatings on Al 2024-T3," Corrosion Science, Elsevier, Feb 2010.
The definitive version is available at https://doi.org/10.1016/j.corsci.2009.09.023
Department(s)
Materials Science and Engineering
Research Center/Lab(s)
Peaslee Steel Manufacturing Research Center
Keywords and Phrases
Aluminum; Rare Earth Elements; Pitting Corrosion; Oxide Coatings
International Standard Serial Number (ISSN)
0010-938X
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2010 Elsevier, All rights reserved.
Publication Date
01 Feb 2010
