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.

Subject
Scanning electron microscopy, Water, Molybdenum, Iron oxide, Atomic force microscopy, Chromium, Oxide layers, Dissolution, Metal oxides, Chromium oxide, Oxide surfaces, Nickel, Alloys
Keywords:
Alloy 22, UNS N06022, oxide film, passive, atomic force microscopy, polarization, multiionic solution
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2003
GOV
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