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Investigation of formation and inhibition mechanism of cerium conversion films on Al 2024 alloy

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Investigation of formation and inhibition mechanism of cerium conversion films on Al 2024 alloy.htm (391bytes)
Date
2002
Author
Shao, MH
Huang, RS
Fu, Y
Lin, CJ
林昌健
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  • 化学化工-已发表论文 [14469]
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Abstract
To study the mechanism of formation and inhibition of Ce conversion films on Al 2024-T3 alloy, scanning microreference electrode technique (SMRE) is used to probe the potential map on Al 2024-T3 in CeCl3 solution, the localized corrosion of Al alloy decreases with immersion time and disappears finally, which results from the competition of Cl- aggression and Ce3+ inhibition on alloy surface. The results of X-ray photoelectron spectroscopy (XPS) indicate that the Ce conversion films consist of Al2O3, CeO2 and Ce2O3(Ce(OH)(3)), and CeO2/Ce2O3 ratio decreases with the immersion time. When a critical pH for Ce(OH), formation was reached, Ce(OH)3 Will precipitate on the micro cathodic area on alloy surface. Consequently, H2O2, the product of the catholic reaction will oxidize a part of Ce(OH)(3) to CeO2, which appears a better corrosion resistance for Al alloys.
Citation
JOURNAL OF RARE EARTHS,2002,20(6):640-645
URI
http://dx.doi.org/doi:10.1107/S160053680301938X
https://dspace.xmu.edu.cn/handle/2288/12235

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