Abstract
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 (fCu) 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 fCu 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.
Highlights
Bronze alteration phenomena in different mediums have been studied in many researches [1,2,3,4,5,6].The electrochemical behavior of archeological bronze (Cu–10Sn)in neutral aerated NaCl solution has been recently investigated through potentiodynamic measurements using a rotating disk electrode
In a previous work [31], the polarization curve was used to determine the electrochemical behaviour of a synthetic bronze electrode (Cu10Sn) analogous to archaeological bronze immersed in chloride solution (0.5 mol L−1) at the temperature of 30 °C for a scan rate of 10 mVs−1 (Fig. 1)
To understand the corrosion mechanism of synthetic bronze and to link the internal oxidation of the alloy to dissolution of copper or tin, we correlate the electrochemical study with the characterisation methods such as X-ray photoelectron spectroscopy (XPS) [32, 33]
Summary
Bronze alteration phenomena in different mediums have been studied in many researches [1,2,3,4,5,6].The electrochemical behavior of archeological bronze (Cu–10Sn)in neutral aerated NaCl solution has been recently investigated through potentiodynamic measurements using a rotating disk electrode. The anodic J–E curve exhibits three main regions, that. These findings were improved by another research that characterized the anodic layers formed on Cu–10Sn bronze in 0.1 M NaCl solution [8].In the whole anodic domain, investigations performed on a bronze rotating disk electrode (RDE) revealed the systematic formation of a uniform oxidation layer.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
