The Effects of Rare Earth Elements on Corrosion Resistance of Sol-Gel Coatings for 2024 Aluminum Alloy

Abstract:

Rare-earth modified coatings on 2024 aluminum alloy were prepared by sol-gel methods, aiming at improving the corrosion resistance with the environmental friendly features. The investigation put emphases on the effects of rare-earth additives on corrosion resistance and microstructure of sol-gel coatings. The results revealed that coated samples containing 2g·L-1 rare-earth not only delayed the incubation period of corrosion, but also hindered the development of it, and their corrosion rate decreased 80.3% compared with the bare ones and was 15.9% than the rare-earth free coated ones. The action of rare-earth on morphology and microstructure of sol-gel coatings for 2024 Al alloy was studied by SEM. High density good cohesion, and intact coverage were showed clearly ,which provided a reliable proof of the reformative effects of rare-earth additives.

• Periodical: Materials Science Forum (Volumes 546-549)
• Pages: 1801-1804
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.546-549.1801
• Online since: May 2007
• Authors: Yue Xu, Ying Jie Li, Sha Li
• Keywords: Aluminium Alloy, Corrosion Resistance, Rare Earth Element (REE), Sol-Gel Coating

References

[1] Wessel, James K� Handbook of Advanced Materials : Enabling New Designs�Hoboken, N. J John Wiley & Sons, Inc. (US), 2004�P423.

[2] Wahab, M A; Park, J H; Alam, M S, �Journal of materials processing technology. 174, no. 1, (2006): 211.

[3] Ilevbare, G O ; Scully, J R ; Yuan, J ; Kelly, R G CORROSION SCIENCE - Inhibition of Pitting Corrosion on Aluminum Alloy 2024-T3: Effect of Soluble Chromate Additions vs. Chromate Conversion Coating� Corrosion. 56, no. 3, (2000): 227.

DOI: 10.5006/1.3287648