Add time:08/11/2019         Source:sciencedirect.com

In this study, we examined how aluminium corrosion in Al–Cu/PANI galvanic couples in a marine environment is influenced by deposition of polyaniline (PANI) on copper. Polarization curves and immersion assays in 0.1 M NaCl were performed. The morphologies of etched Al and corrosion products were observed by SEM, and the Al ions in solution were quantified by atomic absorption spectroscopy. A reduction in aluminium damage due to galvanic corrosion was observed as a result of decreased effective area for the oxygen reduction reaction on Cu/PANI electrode. Furthermore, an electrochemical reduction of PANI from leucoemeraldine to emeraldine base is proposed.

► The presence of Polyaniline in the Al–Cu system produces a decrease in the oxygen reduction reaction. ► In the marine enviroment, aluminium in Al–Cu couples, suffers pitting and exfoliation. ► The aluminium deterioration increases with chloride and enviromental sulphur dioxide presence, mainly when it is united to bare copper.

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