The corrosion performances of AA6061 aluminum alloy in tropical seawater was investigated using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and their morphology was characterized by the scanning electron microscopy (SEM). The results showed that the presence of sodium benzoate as an inhibitor significantly decrease the corrosion current densities (i corr ), corrosion rates and double layer capacitance (C dl ), whilst increasing the polarization resistance (R p ). The scanning electron microscopy (SEM) images indicated that the mechanism of charge transfer and the formation of thin film have been taken place on the specimens.
Addel-Gaber, A.M., Abd-El-Nabey, B.A., Sidahmed, I.M., El-Zayady, A.M., and Saadawy, M. (2006), Kinetics and thermodynamics of aluminum dissolution in 1.0 M sulphuric acid containing chloride ions. Mat. Chem. and Phys., vol. 98, pp. 291-297.
Badawy, W.A., Al-Kharafi, F.M., and El-Azab, A.S. (1999), Electrochemical behaviour and corrosion inhibition of Al, Al-6061 and Al-Cu in neutral aqueous solutions. Corros. Sci., vol. 41, pp. 709-727.
Anselmo, N., May, J.E., Mariano, N.A., Nascente, P.A.P., Kuri, S.E. (2006), Corrosion behavior of supermantensitic stainless steel in aerated and CO2-saturated synthetic seawater. Mat. Sci. and Eng. A., vol. 428, pp. 73-79.
Brown, S. (1999), Feasibility of replacing structural steel with aluminum alloys in the shipbuilding industry, University of Wisconsin, Madison.
Haruna, T., Kouno, T., and Fujimoto, S. (2005), Electrochemical conditions for environment-assisted cracking of 6061 Al alloy. Corros. Sci., vol. 47, pp. 2441-2449.
Harley, S.W., Das, S. Miller, J.W. (2000), Aluminum R&D for automotive uses and the department of energy’s role. U.S. Department of Energy, Washington D.C.
Blustein, G., Rodriguez, J., Romanogli, R., and Zinola, C.F. (2005), Inhibition of steel corrosion by calcium benzoate adsorption in nitrate solutions: theoretical and experimental approaches. Colloid and Interface Sci., vol. 278, pp. 393-403.
Gileadi, E. and Kirowa-Eisner, E. (2005), Some observations concerning the Tafel equation and its relevance to charge transfer in corrosion. Corrosion Science Volume 2005, vol. 47(12), pp. 3068-3085
Bethencourt, M., Botana, F.J., Cauqui, M.A., Marcos, M., and Rodriguez, M.A. (1997), Protection against corrosion in marine environments of AA5083 Al-Mg alloy by lanthanide chlorides. Alloys and Compounds, vol. 250, pp. 455-460.
Abd El Rahim, S.S., Hassan, H.H., and Amin, M.A. (2002), The corrosion inhibition study of sodium dodecyl sulphonate to aluminum and its alloy in 1.0 M HCl solution. Mat. Chem. and Phys., vol. 78, pp. 337-348.
Aramaki, K. (2001), Effects of organic inhibitors on corrosion of zinc in an aerated 0.5 M NaCl solution, Corros. Sci., vol 43, pp. 1985-2000.
Rosalbino, F., Angelini, E., De Negri, S., Saccone, A., and Delfino, S. (2006), Electrochemical behavior assessment of novel Mg-rich Mg-Al-RE alloys (RE=Ce, Er). Intermetallics, vol.14, pp. 1487-1492.
Trabanelli, G., Montecelli, C., Grassi, V., and Frignani, A. (2005), Electrochemical study on inhibitors of rebar corrosion in carbonated concrete. Cement and Concrete Research., vol. 35, pp. 1804-1813.
Reis, F.M., de Melo, H.G., and Costa, I. (2006), EIS investigation on Al 5052 alloy surface preparation for self-assembling monolayer. Electrochimica Acta., vol. 51, pp. 1780-1788.