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Corrosion behaviour of CuAlMn alloy in chloride and sulphate electrolytes

The electrochemical behavior of CuAlMn alloy in 0.5 mol dm-3 NaCl solution and in the presence of 0.1, 0.3 and 0.5 mol dm-3 Na2SO4 at T = 20 oC and pH = 7 was investigated. Conventional electrochemical techniques were used including open circuit potential, linear and potentiodynamic polarization measurements. The electrochemical measurements showed that the presence of sulfate ions in the chloride solution leads to a decrease in corrosion current density values and to an increase in polarization resistance values for the SO42- ion concentrations of 0.1 and 0.3 mol dm-3. At the highest concentration of sulfate, corrosion current density increases again, and the value of the polarization resistance decreases, probably due to the dissolution of the surface layer of corrosion products. The effect of electrolyte exposure time on 0.5 mol dm-3 NaCl and 0.5 mol dm-3 NaCl + 0.5 mol dm-3 Na2SO4 was examined by measuring with linear polarization method over a period of 24 hours, with the polarization resistance values increasing with time in both NaCl and NaCl + Na2SO4 solution, and these values being significantly higher in the solution with sulphate ions. After electrochemical measurements, the corroded electrode surfaces were examined with an optical and scanning electron microscope.

CuAlMn alloy, corrosion, electrochemical metods, SEM/EDS

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