Effect of the Microstructure and Environmental Exposure Conditions on the Corrosion Behaviour of the 2050 Alloy

Abstract:

Alternate immersion-emersion tests were performed for a 2050 aluminium alloy to characterize its corrosion resistance with exposure conditions representative of in service-conditions. Tests were performed for T34 samples and aged samples. After continuous immersion tests, T34 samples exhibited intergranular corrosion while intragranular corrosion was observed for aged samples. The alternate immersion-emersion tests led to a corrosion extension to the subgrain boundaries, for both T34 and aged samples, as shown by electron backscattered diffraction analysis.

• Periodical: Materials Science Forum (Volumes 794-796)
• Pages: 205-210
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.794-796.205
• Online since: June 2014
• Authors: Mathilde Guérin*, Eric Andrieu, Grégory Odemer, Joel Alexis, Christine Blanc
• Keywords: Aging, Aluminium Alloy, Corrosion, Grain Boundary, Immersion-Emersion Tests

References

[1] R. J. Rioja, J. Liu, Evolution of Al–Li base products for aerospace and space applications, Metall. Mater. Trans. A 43A (2012) 3325-3337.

DOI: 10.1007/s11661-012-1155-z

[2] J. E Kertz, P. I Gouma, R.G. Buchheit, Localized Corrosion Susceptibility of Al-Li-Cu-Mg-Zn Alloy AF/C458 due to Interrupted Quenching from Solutionizing Temperatures, Metall. and Mater. Trans. A 33 (2001) 2561-2573.

DOI: 10.1007/s11661-001-0046-5

[3] N. Jiang, J. F. Li, Z. Q. Zheng, Effect of aging on mechanical properties and localized corrosion behaviors of Al-Cu-Li alloy, Transactions of non ferrous metals society of China 15 (2005) 23-29.

[4] B. Decreus, A. Deschamps, F. De Geuser, P. Donnadieu, C. Sigli, M. Weyland, The influence of Cu/Li ratio on precipitation in Al–Cu–Li–x alloys, Acta Mater. 61 (2013) 2207-2218.

DOI: 10.1016/j.actamat.2012.12.041

[5] R.G. Buchheit, J.P. Moran, G.E. Stoner, Localized corrosion behavior of alloy 2090-the role of microstructure heterogeneity, Corrosion 46 (1990) 610-617.

DOI: 10.5006/1.3585156

[6] F. Viejo, A.E. Coy, F.J. Garcia, Z. Liu, P. Skeldon, G.E. Thompson, Relationship between microstructure and corrosion performance of AA2050-T8 aluminium alloy after excimer laser surface melting, Corros. Sci. 52 (2010) 2179-2187.

DOI: 10.1016/j.corsci.2010.03.003

[7] C. Henon, S. Rouault, Comparison of corrosion performance and mechanisms of Al-Cu alloys with and without Li addition, Proceeding of the 13th International Conference on aluminium alloys, TMS, Pittsburgh, USA, (2012).

DOI: 10.1002/9781118495292.ch63

[8] V. Proton, J. Alexis, E. Andrieu, J. Delfosse, A. Deschamps, F. De Geuser, M. -C. Lafont, C. Blanc, The influence of artificial ageing on the corrosion behaviour of a 2050 aluminium-copper-lithium alloy, Corros. Sci. 80 (2014) 494-502.

DOI: 10.1016/j.corsci.2013.11.060

[9] C. Larignon, J. Alexis, E. Andrieu, C. Blanc, G. Odemer, J. -C. Salabura, Corrosion Damages Induced by Cyclic Exposure of 2024 Aluminum Alloy in Chloride-Containing Environments, J. Electrochem. Soc. 58 (2011) C284-C295.

DOI: 10.1149/1.3610401

[10] C. Augustin, E. Andrieu, C. Blanc, J. Delfosse, G. Odemer, Empirical Propagation Laws of Intergranular Corrosion Defects Affecting 2024 T351 Alloy in Chloride Solutions, J. Electrochem. Soc. 157 (2010) C428-436.

DOI: 10.1149/1.3497297