Screening study of spray solution parameters for depositing cerium-based conversion coatings on Al alloy 2024-T3 |
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Authors: | Shujiang Geng Pu Yu Matthew J O’Keefe William G Fahrenholtz Thomas J O’Keefe |
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Affiliation: | (1) Department of Materials Science and Engineering, Graduate Center for Materials Research, Missouri University of Science and Technology, Rolla, MO 65409, USA; |
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Abstract: | 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. |
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