Abstract
The electrochemical behaviour of three Al-Zn alloys (1 – 5 – 10% Zn) in 0.5 NaCl solutions with a pH of 2 and of 8.2, under controlled fluid dynamic conditions (rotating disks at 500 – 2500 r.p.m.) at 20 – 40 – 60°C has been studied. Stationary potentiostatic anodic polarisation curves have been performed. S.E.M. and EDAX surface analysis have been obtained on anodically polarised specimens under coulostatic conditions. The morphology and mechanisms of anodic dissolution have been discussed as a function of anodic overpotential, charge density and zinc content of the studied alloys. Evans polarisation diagrams of the galvanic cells obtained coupling the Aluminium alloys either with Platinum or with Nickel as well as with stainless steel have been performed in sea water both under stagnant and stirred conditions.
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