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Effect of carbonate and lithium ions on the corrosion performance of pure aluminium

โœ Scribed by J.C.S. Fernandes; M.G.S. Ferreira

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
293 KB
Volume
37
Category
Article
ISSN
0013-4686

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โœฆ Synopsis

The effect of the presence of lithium ions in carbonate solutions on the corrosion behaviour of aluminium was studied taking into consideration the particular importance of the use of lithiumcontaining aluminium alloys in aeronautics. dc electrochemical polarization measurements were performed on pure aluminium (99.999%) in mixed solutions of Na,CO, and Li,CO, , the results showing that the presence of Li+ in solution improves the passivation of aluminium, but only above a critical concentration of carbonates. The presence of chlorides in those solutions above a certain level is deleterious for the passivation films, since it leads to localized attack. This process seems to be related to the easy formation of lithium chloride containing species, which promote local film dissolution.

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