Elevated Temperature Potential-pH Diagrams for the Cr-H2O, Ti-H2O, Mo-H2O, and Pt-H2O Systems

Abstract

This paper describes the potential-pH diagrams of chromium, molybdenum, titanium, and platinum in water at temperatures from 25 to 300 C. The diagrams can be utilized to predict the stability of these metals in aqueous solutions over this temperature range. A computer program written by D. D. Macdonald, et al, was utilized to perform the thermodynamic calculations and to construct the diagrams. In general, the diagrams indicate that the metals are more active at higher temperatures and that the area of the stable metal oxide domains decreases with increasing temperature.