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Research Journal of Environmental Sciences

Year: 2007 | Volume: 1 | Issue: 4 | Page No.: 185-190
Research Article

Comparative Analysis of the Corrosion Susceptibility of Cast Al-Mn Alloys in Acidic Environments

C.E. Ekuma
Department of Industrial Physics, Ebonyi State University, P.M.B. 053, Abakaliki, Nigeria
N.E. Idenyi
Department of Industrial Physics, Ebonyi State University, P.M.B. 053, Abakaliki, Nigeria
S.I. Neife
Department of Material and Metallurgical Engineering, Enugu State University of Science and Technology, P.M.B. 01160, Enugu, Nigeria
A study of the effects of the corrosion susceptibility of Al-Mn alloys in varying concentrations of acidic media has been concluded. Al-Mn alloys containing 1.5, 2.5 and 3.5% Mn by weight were cast into rods and machined into cylindrical coupons of average surface area of 13.33 cm2. The samples were preweighed and immersed in beakers containing 0.25, 0.5 and 1.0 M solutions of H2SO4 and HCl solutions, respectively. The set-ups were allowed to stand for 48 h with intermittent withdrawn of a set 12 hourly for corrosion rate characterization. The results showed the usual corrosion trend (prominent in passivating metals) of an initial abrupt increase, followed by a decline, which was maintained in all the media and increased as the percentage of manganese increased. The observed increase in sternness of attack may be ascribed to redistribution in the grain boundary structure of the alloys due to presence of manganese leading to the formation of eutectic phase, which consequently caused mismatch of Al-Mn binary alloy systems.
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