Screening Study of Spray Solution Parameters for Depositing Cerium-based Conversion Coatings on Al Alloy 2024-T3
Cerium-based conversion coatings were deposited on aluminum alloy 2024-T3 by a spray process using a solution containing cerium chloride, hydrogen peroxide, and gelatin. As deposited coatings were composed of hydrated cerium oxide and were post-treated in a phosphate solution to improve corrosion performance. Coating solution parameters, including the pH (1–2.5), cerium chloride concentration (0.025–0.125 M), and hydrogen peroxide content (0–1.2 M), were varied to investigate the effect(s) of solution parameters on the corrosion performance of the post-treated coatings. Results indicated that thickness of coatings deposited from solutions with different pH values were similar, while coating thickness increased with increasing concentration of cerium chloride and hydrogen peroxide in the solutions. Electrochemical impedance spectroscopy and observations of the surface appearances of the coatings indicated that coatings deposited from solutions with a pH 2, a cerium concentration of 0.1 M, and a hydrogen peroxide concentration of 0.8 M exhibited the best corrosion resistance.
S. Geng et al., "Screening Study of Spray Solution Parameters for Depositing Cerium-based Conversion Coatings on Al Alloy 2024-T3," Journal of Applied Electrochemistry, Springer Verlag, Oct 2009.
The definitive version is available at http://dx.doi.org/10.1007/s10800-009-0027-8
Materials Science and Engineering
Keywords and Phrases
Industrial Chemistry/Chemical Engineering; Physical Chemistry; Electrochemistry; Al2024-T3; Cerium Conversion Coating; Solution Parameters; Corrosion; EIS
Article - Journal
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