Abstract
ABSTRACT In this work, Al–20Cu intermetallic alloy was subjected to corrosion evaluation in synthetic sea water at different pH values, and room temperature. The corrosion tests were made to study the alloy in potential applications in hydrogen generation. For this purpose, the electrochemical techniques of potentiodynamic polarisation, linear polarisation resistance, and electrochemical impedance spectroscopy were used. Experimental results showed that the alloy is not susceptible to passivation and exhibits the highest current density and corrosion rate at pH 14. In this condition, the governing corrosion mechanism was associated with activation, promoted by the continuous anodic dissolution of uncovered metallic zones, due to the detachment of previously formed corrosion products. However, the results at near-neutral pH presented higher corrosion resistance and a corrosion mechanism limited by main diffusion of ionic species. In general, the primary mechanism of corrosion in the solutions was associated to charge transfer.
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