A surface study of the passivation of Fe-Cr-Co magnet alloys in sulphuric acid solution

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)141-149
Journal / PublicationApplied Surface Science
Issue number2
Publication statusPublished - Sep 1990
Externally publishedYes


Ferritic Fe-24Cr-(3-12)Co alloys in the as-quenched and step-aged conditions were exposed in 0.5 M H2SO4 solution. Electrochemical, Auger and XPS techniques were used to characterize the passive film formed on these alloys in sulphuric acid solution. The results show that higher Co contents in the as-quenched Fe-24Cr-Co alloys are effective in suppressing the anodic dissolution of Fe prior to passive film formation. However, spinodal decomposition of the aged Fe-24Cr-12Co alloy into Fe-rich α1 particles leads to an increase of the current density in the passive region. © 1990.