Copper pourbaix diagram
History of Pourbaix diagrams in conservation studies The study of bronze corrosion has a very long history (Scott Table 1: System Cu-Sn-Cl-H2O Pelton Figure No. Inclusion of both copper and tin on the same diagram helps to elucidate corrosion processes. To date, these have been drawn using data for pure metals. Eh-pH or Pourbaix diagrams have been a very useful tool in understanding corrosion. Improved understanding of corrosion also aids conservation assessments and treatments. These studies may help in grouping bronzes from unknown provenances and in differentiating naturally corroded bronzes from those which have been patinated artificially. The diagrams clarify the corrosion possibilities for bronzes in different environments, emphasize the role of tin oxide in bronze corrosion, and point toward possibilities for future research Keywords: Eh-pH diagrams, Pourbaix, copper, tin, corrosion, tin oxide, redeposited copper, burial, environment Introduction Enhanced understanding of corrosion during exposure, burial, or submersion can help predict the condition of archaeological bronzes and enable us to say something about their environments. Box 6079, Station Downtown Montreal, Quebec H3C 3A7, Canada * Corresponding author: Abstract New versions of the conventional Eh-pH or Pourbaix diagrams, incorporating copper and tin together as well as intermetallic phases, yield an enhanced understanding of corrosion processes.
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Of Chemical Engineering, Ecole Polytechnique, P.
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Pelton c a Chase Art Services, 508 route 169, Woodstock, Connecticut 06281, USA b Lehigh University Department of Materials Science and Engineering, Whitaker Laboratory #5, Bethlehem, PA 18015, USA c Centre de Recherche en Calcul Thermochimique, Department. Thomas Chase a *, Michael Notis b and Arthur D. 1 New Eh-pH (Pourbaix) diagrams of the copper-tin system W.