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Effect of pH on corrosion of CuAlMn alloy in 0.9% NaCl solution

This paper presents the results of corrosion investigation of cast CuAlMn alloy in 0.9 % NaCl solution at 37 o C and pH = 3.4, 5.4 and 7.4. Investigations were performed by open circuit potential measurements, linear and potentiodynamic polarization measurements. After polarization measurements, electrode surfaces were investigated by optical microscope and also with SEM/EDS analysis. Results of polarization measurements have shown that the corrosion current density of CuAlMn alloy was decreased and the values of polarization resistance were increased with the increasing in pH. Optical microscopy surface examination of the CuAlMn alloy, after the polarization investigations, revealed the grain boundaries within the alloy as well as damages on the surface of the electrodes due to the uniform corrosion of the alloy. The EDS analysis determined the chemical composition at certain sites on the surface of the samples.

CuAlMn alloy ; NaCl solution ; corrosion ; polarization ; SEM/EDS

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