The passive corrosion rate of Alloy 22 (UNS N06022) is exceptionally low in a wide range of aqueous solutions, temperatures and electrochemical potentials. Alloy 22 (UNS N06022) contains approximately 22% chromium (Cr) by weight; thus, it forms a Cr-rich passive film in most environments. A better understanding of the composition, thickness and other properties of the passive film was undertaken. The aim of this research was to determine the general characteristics of the oxide film that forms on Alloy 22 (UNS N06022), as a function of solution pH, temperature and applied electrochemical potential.
Keywords: Alloy 22, UNS N06022, oxide film, passive, atomic force microscopy, polarization, multiionic solution