EFFECT OF IMMERSION TIME ON THE CORROSION BEHAVIOR OF FRICTION STIR WELDED AA2024 ALUMINIUM ALLOY WELDS
Keywords:
AA2024 Aluminium alloy, Friction stir welding, Immersion corrosion testAbstract
In this research, the corrosion behaviour of friction stir welded AA2024 aluminium alloy immersed in NaCl solution with different immersion times have been investigated using immersion corrosion tests. The microstructural characterization was examined using light optical microscopy and scanning electron microscopy. It is resulted that with the increase of immersion time, the corrosion rate decreases for the specimens undergoing immersion corrosion tests. It proved that the outer layer made a predominant role to strike against corrosion with the increase of time. The decrease in both corrosion pit area and depth, the increase of time is caused by general corrosion reducing the area surrounding the pits, as well as reducing the pit depth simultaneously. General corrosion removes the surrounding aluminium, thereby shrinking some pits and reducing their volume. Thus with the increase of immersion time the corrosion rate decreases.
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Yi, W.S., O'grady, W.E., Ramaker, D.E. and Natishan, P.M. (2000) “Chloride ingress into aluminum prior to pitting corrosion: An investigation by XANES and XPS” Electrochemical Society, Vol 47, pp 2952-2958.
Thomas, W.M., Nicholas, E.D., Needham, J.C., Murch, M.G., Smith, P.T. and Dawes C.J. (1991) “Friction stir butt welding”, International Patent Application No. PCT/GB92/ 02203, December 1991.
Thomas, W.M. and Nicholas, E.D. (1997) “Friction stir welding for the transportation industries”, Materials and Design, Vol 18, pp. 269–273.
Ericsson, M. and Sandstrom, R. (2003) “Influence of welding speed on the fatigue of friction stir welds, and comparison with MIG and TIG”, International Journal of Fatigue, Vol. 25, pp. 1379–1387.
Balasubramanian, V., and Lakshminarayanan, A.K.. (2008) “The mechanical properties of the GMAW, GTAW and FSW joints of the RDE-40 aluminium alloy” International Journal of Microstructure and Materials Properties, Vol. 3, pp. 837–853.
Xu, W.F., Liu, J.H., Luan, G.H. and Dong, C.L. (2009) “Microstructure and mechanical properties of friction stir welded joints of aluminum alloy thick plate with different welding state”, Acta Metallurgica Sinica, Vol. 45, pp. 490–496.
Rajakumar, S., Muralidharan, C., and Balasubramanian, V. (2010) “Establishing empirical relationships to predict grain size and tensile strength of friction stir welded AA 6061-T6 aluminium alloy joints”, Transactions of Non ferrous Metals Society of China, Vol. 20,pp. 1863-1872.
Díaz-Ballote, L., López-Sansores, J.F., Maldonado-López, L. and Garfias-Mesias, L.F. (2009) Electrochim. Commun. Vol. 11, pp. 41-47
Wadeson, D.A., Zhou, X., Thompson, G.E., Skeldon, P., Djapic Oosterkamp, L. and Scamans, G. (2006) Corrosion Science, Vol. 48 pp. 887 -8894.
Jariyaboon, M., Davenport, A.J., Ambat, R., Connolly, B.J., Williams, S.W. and Price, D.A. (2007), Corrosion Science Vol. 49, pp. 877-884.
Sehgal, A., Lu, D., and Frankel, G.S. (1998), Electrochemical Society, Vol. 145 pp. 28-34.
Song, W., Martin, H., Hicks, A., Seely, Christopher, D., Walton, A., Wang, P. and Horstemeyer, M.F. (2014) “Corrosion behaviour of extruded AM30 magnesium alloy under salt-spray and immersion environments” Corrosion Science, Vol. 78, pp. 353–368.
Buchheit, R.G., Grant, R.P., Hlava, P.F., Mckenzie, B. and Zender, G.L. (1997) “Local dissolution phenomena associated with S phase (Al2CuMg) particles in aluminum alloy 2024-T3”, Journal of the Electrochemical Society, Vol. 144, pp. 2621– 2628.
Grilli, R., Baker, M., Castle, J.E., Dunn, B. and Watts, J.F. (2010) “Localized corrosion of a 2219 aluminium alloy exposed to a 3.5% NaCl solution”, Corrosion Science, Vol. 52, pp. 2855– 2866.
Guillaumin, V. and Mankowski, G. (1999) “Localized corrosion of 2024 T351 aluminum alloy in chloride media”, Corrosion Science, Vol. 4, pp. 421–438.
Queiroz, F.M., Magnani, M., Costa, I. and de Melo, H.G. (2008) “Investigation of the corrosion behaviour of AA2024-T3 in low concentrated chloride media” Corrosion Science, Vol. 50, pp. 2646–2657.
