Abstract
Al-Li alloy 8090 and a binary alloy with the same lithium contents (2.5 wt-%) were studied in regard to their corrosion susceptibility in chloride containing solutions using electrochemical methods. Data were compared with results obtained for pure aluminium in the same experimental conditions. The effect of lithium ions on aluminium passivation has been demonstrated previously as particularly effective in alkaline solutions, with the obtained film having a protective character and an inhibitive action on the pitting nucleation process. In this work voltammetric and impedance spectroscopy studies were carried out in presence and absence of lithium ions, in alkaline solutions. Chloride ions were added in concentration s varying from 0.001M to 0.6M allowing pitting potentials to be determined and confirming the role the lithium ions in the promotion of corrosion resistance of aluminium and aluminium alloys.
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