Abstract
A copper patina provides both a pleasing aesthetical appearance and corrosion protection to artistic artworks so the electrochemical features for restoring metallic artifacts need to be studied. In this study, the potentiodynamic scan rate consisting of 0.5, 1, 3, 5, 7 10 mV/s to develop artistic patinas on a quaternary copper alloy was studied. The results obtained by SEM/EDS indicate that the patina on the surface is a porous layer mainly composed of copper/chloride corrosion products. The X-Ray analysis identified the formation of nantokites and atacamites depending on the scan rate that was applied. The morphology appearance shows a greenish patina and a more porous structure for scan rates lower than 5 mV/s. Polarization curves and electrochemical impedance spectroscopy determined that the corrosion protection increases at lower scan rates due to higher barrier properties of the patina layer.
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