The Reactions of Iron-Nickel Alloys with Oxygen

摘要

In order to understand the kinetics of the oxidation of iron-nickel alloys it is desirable to know the nature of the Fe-Ni-0 equilibria. Fe-Ni alloys of several compositions have been partially oxidized and then equilibrated by maintaining them in a closed system at 1O50 or 1095O C. for an extended period. The products have been examined microscopically, by x-ray diffraction and by chemical analysis to determine their structure and composition. The three-phase field for alloy-wustite-spinel has been located approximately, and the sense of some of the two-phase tie lines has been established. It is possible to rationalize much of the earlier work on the kinetics of oxidation of iron-nickel alloys and to estimate the importance of some sources of error in the determination of thermodynamic activities by the formation of thin oxide films in hydrogen-water vapor mixtures.