Abstract
We report on the composition and structure of passive oxide films of melt‐spun ribbons of amorphous (x = 3, 5, and 7) alloys using x‐ray absorption near‐edge structure (XANES) spectroscopy. The passive films were formed in an aerated solution of 0.9 weight percent (w/o) NaCl at constant potential in the passive region at −0.5 V vs. a saturated calomel electrode (SCE) for 60 min. The oxidation state of Fe in the passive films of these alloys is mainly +3, such as in and /or . Cerium in the passive film of alloy is present mainly in the +3 oxidation state as and/or , with only a small fraction as . In the passive film of alloy it is present in the +3 and +4 oxidation states (as and/or and ) while in alloy the passive film contains cerium in the +4 oxidation state as . The fact that the passive film may consist of mixed oxide phases containing Al, Fe, and Ce cannot be ruled out.
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