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Effects of Ce, Mo and Si ion implantation on the passive layer composition and high‐temperature oxidation behaviour of AISI 304 stainless‐steel studied by soft x‐ray absorption spectroscopy
Author(s) -
Gutiérrez A.,
López M. F.,
Pérez Trujillo F. J.,
Hierro M. P.,
Pedraza F.
Publication year - 2000
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/1096-9918(200008)30:1<130::aid-sia781>3.0.co;2-0
Subject(s) - oxide , materials science , x ray absorption spectroscopy , x ray photoelectron spectroscopy , isothermal process , layer (electronics) , analytical chemistry (journal) , ion implantation , chemical state , corrosion , absorption (acoustics) , metallurgy , ion , metal , surface layer , absorption spectroscopy , spectroscopy , chemistry , chemical engineering , composite material , physics , organic chemistry , chromatography , quantum mechanics , engineering , thermodynamics
The influence of Ce, Mo and Si ion implantation on the chemical properties of AISI 304 stainless‐steel passive and oxide layers was studied by means of soft x‐ray absorption spectroscopy (XAS). Applying this technique at the transition metal 2p absorption thresholds, the composition and chemical state of the passive layer were determined. A surface Cr enrichment is observed for the ion‐implanted samples in comparison with non‐implanted samples, which can be associated with better corrosion behaviour. To investigate the effects of ion implantation on the high‐temperature oxidation behaviour of AISI 304 stainless‐steel, the oxide layer formed after an isothermal oxidation at 1173 K for 32 h was also investigated. The XAS data show mainly the presence of Cr and Mn oxides in the surface region of all samples. The Cr/Fe ratio—a parameter that can be associated with the protective character of the oxide scale—is higher for the Si‐ and Ce‐implanted samples than for the as‐received sample. The Mo‐implanted sample has the lowest Cr/Fe ratio, suggesting a poor oxidation resistance at high temperatures in this case. Copyright © 2000 John Wiley & Sons, Ltd.