Abstract
Auger electron spectroscopy has been used to characterize the surface composition and the oxide thickness for electrolytically polished Fe 50%/Ni 50% iron-nickel alloy specimens that had been given one of the following surface treatments: (1) ultrasonic cleaning in an organic solvent, (2) exposure to an argon plasma, (3) immersion in boiling 15% H 2O 2, or (4) exposure to an O 2 plasma. The results show that the oxide thickness increased in the following order: solvent cleaned < oxidation with H 2O 2 < oxidation in O 2 plasma. The O 2 plasma treated and H 2O 2 treated samples were found to have a pronounced Fe enrichment in the surface oxide. Also, samples with thick oxides showed the least propensity for atmospheric hydrocarbon build-up. These studies will be discussed in terms of thermodynamic and transport properties of transition metal oxides.
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