| dc.description.abstract | Metals in industrial settings such as power plants are often subjected to high
temperature and pressure aqueous environments, where failure to control corrosion
compromises worker and environment safety. For instance, zircaloy (1.2-1.7 wt.% Sn)
fuel rods are exposed to aqueous 250-310 oC coolant in CANDU reactors. The Pourbaix
(EH-pH) diagram is a plot of electrochemical potential versus pH, which shows the
domains of various metal species and by inference, corrosion susceptibility. Elevated
temperature data for tin +II and tin +IV species were obtained using solid-aqueous phase
equilibria with the respective oxides, in a batch vessel with in-situ pH measurement.
Solubilities, determined via spectroscopic techniques, were used to calculate equilibrium
constants and the Gibbs energies of Sn complexes for E-pH diagram construction. The
SnOH3+ and Sn(OH)
species were incorporated, for the first time, into the 298.15 K and
358.15 K diagrams, with novel G ͦ values determined at 358.15 K. | en |
