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Electrochemical behaviour of CuAlMn alloy in the presence of chloride and sulphate ions

The electrochemical behaviour of a CuAlMn alloy in a 0.5 M NaCl solution with the addition of different concentrations of Na2SO4 (0.1, 0.3, and 0.5 M) was investigated by observing the change in open circuit potential (EOC) with time, applying polarization methods and electrochemical impedance spectroscopy (EIS). The damage to the metal surface was determined by optical microscopy and SEM/EDS analysis. Although the increase in the content of sulphate ions in the NaCl solution reduces the corrosion current and increases the polarization resistance, their presence does not affect the CuAlMn dissolution mechanism. The anodic reaction of Cu dissolution is controlled by the diffusion of soluble CuCl2

CuAlMn alloy ; Corrosion ; Electrochemical techniques ; SEM/EDS ; Chloride-sulphate electrolyte

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