| Title: |
Characterization of naturally grown oxide layers on copper with and without benzotriazole by electrochemical and photoelectrochemical measurements |
| Authors: |
Ammeloot, Frédérique; Millet, Benoit; Fiaud, C.; Robbiola, Luc; Sutter, Eliane |
| Contributors: |
Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP); Université Paris Sciences et Lettres (PSL); Travaux et recherches archéologiques sur les cultures, les espaces et les sociétés (TRACES); École des hautes études en sciences sociales (EHESS)-Université Toulouse - Jean Jaurès (UT2J); Communauté d'universités et établissements de Toulouse (Comue de Toulouse)-Communauté d'universités et établissements de Toulouse (Comue de Toulouse)-Ministère de la Culture et de la Communication (MCC)-Institut national de recherches archéologiques préventives (Inrap)-Centre National de la Recherche Scientifique (CNRS); I. MacLeod; S. Pennec; L. Robbiola |
| Source: |
METAL 95: International conference on metals conservation ; https://hal.science/hal-00975720 ; METAL 95: International conference on metals conservation, Sep 1995, Semur-en-Auxois, France. pp.109-117 |
| Publisher Information: |
CCSD; James and James Science Publisher, London |
| Publication Year: |
1995 |
| Collection: |
Université Toulouse 2 - Jean Jaurès: HAL |
| Subject Terms: |
photoelectrochemistry; copper; chloride; benzotriazole; corrosion; semi-conductor; [CHIM.MATE]Chemical Sciences/Material chemistry |
| Subject Geographic: |
Semur-en-Auxois; France |
| Description: |
Autorisation éditeur ok ; International audience ; The active corrosion of ancient artefacts (bronze disease) is linked to the presence of copper chloride underneath Cu(I) oxide formed at the surface of bronze. The properties of the Cu(I) oxide determine the mechanism of formation of the corrosion layer and their knowledge would to develop efficient stabilization treatments. The aim of our work is to characterize the structure and the electronic properties of Cu(I) oxide layers formed in different conditions (atmospheric and aqueous electrolyte) under opencircuit potential, using electrochemical and photoelectrochemical methods and SEM. Photoelectrochemistry allows the characterization the semiconducting properties of the passive layer and leads to a better knowledge of the nature of the electrode/solution interface and of the electrochemical reactions occurring at the oxide surface. Atmospheric Cu(I) oxide shows mainly p-type behaviour, whereas Cu(I) oxide layers formed at open-circuit potential by immersion in a NaCl solution were shown to exhibit p-type behaviour during the first hours of immersion and simultaneous n-p behaviour for longer immersion times. In the presence of benzotriazole added to the sodium chloride solution, the photoelectrochemical measu-rements revealed modifications of the semi-conducting properties of the Cu2O layer (duplex p-n layer from short immersion times) and showed that BTA makes the oxide layer more insulating. Results will be discussed in regards to the Cu(I) oxide role on the bronze disease. |
| Document Type: |
conference object |
| Language: |
English |
| Availability: |
https://hal.science/hal-00975720; https://hal.science/hal-00975720v1/document; https://hal.science/hal-00975720v1/file/97Ammeloot-METAL95-Characterization_of_naturally_grown_oxide_layers_on_copper_with_and_without_benzotriazole_by_electrochemical_and_photoelectrochemical_measurements-LR.pdf |
| Rights: |
info:eu-repo/semantics/OpenAccess |
| Accession Number: |
edsbas.D8F2B4A0 |
| Database: |
BASE |