The following is a discussion of the article entitled "The Corrosion Behavior of Nickel 270 in Phosphate-Containing Solutions. by I. A. Maier, published in Corrosion, Vol. 40. No. 10. p. 528 (1984) October.
DISCUSSION by David C. Silverman. Monsanto, St. Louis, Missouri.
In a recent study.1 I. A. Maier attributes the various steps in the active to passive transition of nickel in phosphate solutions in the pH range of about 0.8 to 12.8 to the formation of NiO, Ni3O4, and Ni2O3. This group of oxides has been used by a number of other workers to explain the potentials observed during the active to passive transition of nickel in a number of environments (References 2 through 4, among others). Good agreement between the observed potentials and those calculated from the thermodynamic estimates of Pourbaix5 has been used almost exclusively...
