Electrochemical Polarization as a Sustainable Method for the Formation of Bronze Patina Layers on a Quaternary Copper Alloy: Insight into Patina Morphology and Corrosion Behaviour

The bronze patina is aesthetically pleasing and enhances the corrosion resistance of metallic object. This product layer can develop naturally, through aging or artificially. However, artificial methods require substances that are hazardous to human health environment. In this study, a sustainable approach development, based on anodic polarization 85.5Cu-4.2Pb-4.5Sn-5.7Zn copper alloy immersed in 0.1 M NaCl + 0.01 NaHCO3 were characterized using curves, chronoamperometry, electrochemical impedance spectroscopy, noise measurements, X-ray diffraction, scanning electron microscopy. results indicate potential modifies current density as well diffusion coefficient oxygen associated with thicker layer. Electrochemical Impedance spectroscopy show porous behaviour increases becomes more due formation protective corresponded acquired by chronoamperometry. surface characterization shows applied changes morphology composition products, being identified crystalline phases nantokite atacamite although Cu, Cl, O, Zn, Pb elements also detected.