Corrosion of aluminium in copper-aluminium couples under a marine environment: Influence of polyaniline deposited onto copper |
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Authors: | Rosa Vera Patricia Verdugo Eduardo Muñoz |
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Affiliation: | a Instituto de Química, Facultad de Ciencias, Pontificia Universidad Católica de Valparaíso, Avda. Brasil 2950, Casilla 4059, Valparaíso, Chile b Departamento de Química y Bioquímica, Facultad de Ciencias, Universidad de Valparaíso, Av. Gran Bretaña 1111, Valparaíso, Chile |
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Abstract: | 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. |
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Keywords: | A Aluminium C Atmospheric corrosion A Copper C Polymer coatings |
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