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Oxide films on iron and iron‐copper alloys: An imaging atom probe investigation
Author(s) -
Cornell Rochelle M.,
Smith George D. W.,
Cranstoun G. K. L.
Publication year - 1989
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280440103
Subject(s) - magnetite , atom probe , copper , iron oxide , oxide , hydroxide , materials science , alloy , rust (programming language) , metallurgy , inorganic chemistry , amorphous solid , copper oxide , chemistry , crystallography , computer science , programming language
An imaging atom probe has been used to analyse the oxide films formed by room‐temperature oxidation and atmospheric rusting on iron and on an ironcopper alloy. Both rusted and oxidised specimens field evaporated as Fe 2+ Fe + , O + , FeO + and FeO 2+ . In addition, hydroxylated iron species field evaporated from rust. Exposure of the specimen to sulphate ions during rusting led to incorporation of sulphate in the rust. Oxide films grown on the iron‐copper alloy were enriched in copper. Cu + and Cu 2+ field vaporated from this oxide, but CuO species were not detected. All the oxide films examined consisted of a mixture of amorphous iron hydroxide and magnetite. It is suggested that the copper in the oxide film may have been present as a substitutent in the magnetite lattice.