Surface Characterization of the Corrosion Product Layer Formed on Synthetic Bronze in Aqueous Chloride Solution and the Effect of the Adding of Juniperus Communis Extract by X-Ray Photoelectron Spectroscopy Analysis

The anodic surfaces formed on a synthetic bronze(Cu–10Sn) analogous to a punic material in 0.5 mol L −1 aqueous chloride solution are investigated using the characterization method such X-ray photoelectron spectroscopy (XPS). The results obtained using the XPS analyses allowed to calculate the decuprification factor (f Cu ) and revealed the existence of the phenomenon of detannification during the corrosion process of synthetic bronze in the sodium chloride medium. We show that the copper compounds remain in the corrosion layer, acting as stabilizing specie. Using the same analysis technique XPS, the effects of a Juniperus Communis leaves (JC) extract on the interfacial behaviour of a Cu10Sn modern bronze has been studied. By comparing the cationic composition of the electrode without and with addition of the extract, The obtained results indicate that with the addition of the JC extract, the atomic percentage of the Cu(II) and the Sn(II) are increased which probably involves the formation of a complex in the form of (JC-Cu(+II)) and/or (JC-Sn(+II)) on the surface of the electrode. The f Cu sign was also changed with the addition of the JC extract, which allows to conclude that the JC extract was concluded inhibiting tin oxidation and promoting the copper(I) dissolution.