Effects of Tin on Aluminum–Zinc–Magnesium Alloy as Sacrificial Anode in Seawater
ABSTRACT
This work has investigated the effect of tin composition on Al-Zn-Mg alloy as sacrificial anode in seawater. Corrosion experiments were mounted to determine the optimal effect of tin on the efficiencies of the aluminium alloy anodes. The corroded and unexposed sample surfaces were subject to microstructural characterization using optical microscopy technique. Al-Zn-Mg alloy doped with 0%, 0.01%, 0.05% and 0.1% by weights of tin were prepared to determine the effect of tin on anode efficiency in the environment. The different microstructures of the Al-Zn-Mg-Sn alloy evolved were correlated with the anode efficiencies. The results obtained showed that the anode efficiency of Al-Zn-Mg-Sn alloy increased with tin concentration. The Al-Zn-Mg-0.1Sn gave the best anode efficiency. The microstructures of the Al-Zn-Mg-Sn alloys revealed increased distribution of tin globules and a breakdown of passive alumina film network on the anodes surfaces and thus improving the anode efficiencies
This work has investigated the effect of tin composition on Al-Zn-Mg alloy as sacrificial anode in seawater. Corrosion experiments were mounted to determine the optimal effect of tin on the efficiencies of the aluminium alloy anodes. The corroded and unexposed sample surfaces were subject to microstructural characterization using optical microscopy technique. Al-Zn-Mg alloy doped with 0%, 0.01%, 0.05% and 0.1% by weights of tin were prepared to determine the effect of tin on anode efficiency in the environment. The different microstructures of the Al-Zn-Mg-Sn alloy evolved were correlated with the anode efficiencies. The results obtained showed that the anode efficiency of Al-Zn-Mg-Sn alloy increased with tin concentration. The Al-Zn-Mg-0.1Sn gave the best anode efficiency. The microstructures of the Al-Zn-Mg-Sn alloys revealed increased distribution of tin globules and a breakdown of passive alumina film network on the anodes surfaces and thus improving the anode efficiencies
Cite this paper
L. Umoru and O. Ige, "Effects of Tin on Aluminum–Zinc–Magnesium Alloy as Sacrificial Anode in Seawater," Journal of Minerals and Materials Characterization and Engineering, Vol. 7 No. 2, 2008, pp. 105-113. doi: 10.4236/jmmce.2008.72009.
L. Umoru and O. Ige, "Effects of Tin on Aluminum–Zinc–Magnesium Alloy as Sacrificial Anode in Seawater," Journal of Minerals and Materials Characterization and Engineering, Vol. 7 No. 2, 2008, pp. 105-113. doi: 10.4236/jmmce.2008.72009.
References
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[1] Bennett, L.M. (1978): Economic Effects of Metallic Corrosion in the US, NBS Special Publication 511–1, Washington DC. [2] Callister, W, D. Jr (1997): Materials Science and Engineering, John Wiley and Sons Inc., New York, P. 426 – 480. [3] DNV Recommended Practice RP B401 (1993): “Cathodic Protection Design”, Det Norske Veritas Industry, AS, Hovik. [4] Fagbayi, K.(2000): “Adverse Effect of Temperature on the Operating-Potential Behaviours of Al-Zn-In Anodes”, Ph D Thesis, UMIST. [5] Gummow, R.A. (2004): Efficiency of High Potential Magnesium Anodes for Cathodically Protecting Iron Water Mains, Materials Performance, May, P. 27-33. [6] Genesca. J. and Juarez, J. (2000): Development and Testing of Galvanic Anodes for Cathodic Protection, CONTRIBUTIONS TO SCIENCE, 1 (3), P. 331 – 343. [7] Hollingsworth, E. H and Hunsicker N. Y (1987): “Corrosion of Aluminum and Aluminum Alloys”, Metals Handbook, Vol 13, Corrosion, 9th Ed., ASM International, Metals Park, Ohio, p 583. [8] Kilmer, R. J and Stonere, G. E (1991): ‘Light Weight Alloys for Aerospace Applications II, TMS, p 3. [9] Kuznetsov, G. M., Barsukov, A. D, Krivosheeva, G. B and Dieva, E. G(1986): “ A Study of Phase Equilbrium in Al-Zn-Mg Alloys, Akad, Nayk, SSSR Met., 4, 198. [10] Polmear, I.J. (1995): Light Alloys:Metallurgy of the Light Metals, 3rd Ed., Arnold Pub., London. [11] Suarez, M., Rodriguez, F.J., Juarez, J. and Genesca, J. (1999): EIS Testing of an Indium Activated Aluminum Alloy Sacrificial Anode Using DNV RP B401, EUROCORR ’99 Symposium: Marine Corrosion, Dechema, Frankfurt, P. 1 – 9.