The role of metal cations on the corrosion behaviour of 8090-T851 alloy in pH 2.0 solution

Murthy, KSN and Ambat, R and Dwarakadasa, ES (1994) The role of metal cations on the corrosion behaviour of 8090-T851 alloy in pH 2.0 solution. In: Corrosion Science, 36 (10). pp. 1765-1775.

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Abstract

The influence of cations such as $Cu^{2+}, AI^{3+}$ and $Li^+$ on the corrosion behaviour of 8090-T851(AI-Li) alloy in a pH 2.0 HCI solution was investigated by weight loss and polarization techniques. Weight los s experiments showed that the effect of cation is a strong function of its nature and concentration and the effect became significant only above a critical concentration. Of the cations studied, $Cu^{2+}$ ions were found to be the most aggressive corrosion activators followed by $Al^{3+}$ ions while $Li^+$ ions showed little effect. Polarisation experiments inferred that $Cu^{2+}$ ions influence the corrosion process mainly by accelerating the cathodic reaction. While a decrease in both cathodic and anodic reactions was evident in the presence of $Al^{3+}$ ions at higher concentration, $Li^+$ ions showed no remarkable affect either on cathodic or anodic reactions. Critical analyses of results of the two experiments indicated that the corrosion activation by $Al^{3+}$ ions is due to their chemical reactivity with the corroding substrate. Little enhancement in corrosion by $Li^+$ ions is attributed to the increase in solution conductivity in their presence.

Item Type:	Journal Article
Publication:	Corrosion Science
Publisher:	Elsevier
Additional Information:	Copyright of this article belongs to Elsevier.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	16 Oct 2006
Last Modified:	19 Sep 2010 04:30
URI:	http://eprints.iisc.ac.in/id/eprint/8219

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