Title

Response of Nano-crystalline Cerium Based Conversion Coatings on Al 2024-T3 to Chloride Environments

Abstract

Nanocrystalline cerium-based conversion coatings were found to be effective at retarding corrosion of Al 2024-T3 in sodium chloride environments. Cerium oxide coatings were deposited by spraying an aqueous solution made with cerium chloride onto cleaned panels. After deposition, the coatings were treated in a phosphate solution, which produced dense, nanocrystalline coatings composed of hydrated cerium phosphate. Visually, the coatings appeared to inhibit corrosion and the formation of salt tails for at least 14 days in ASTM B117 neutral salt spray corrosion testing. Cross-sectional imaging using transmission electron microscopy and compositional depth profiling using Auger spectroscopic analysis after salt spray exposure revealed that an aluminum oxide layer was present on the surface of the cerium phosphate coating.

Department(s)

Materials Science and Engineering

Keywords and Phrases

Aluminum 2024-T3; Cerium-Based Conversion Coating; Corrosion Resistance

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2007 Elsevier, All rights reserved.

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