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RESEARCH PRODUCT
Surface spectroscopic study of the corrosion of ultrathin57Fe-evaporated and Langmuir-Blodgett films in humid SO2 environments
J. R. GancedoJ. F. MarcoW. ExelW. MeiselMercedes Graciasubject
Auger electron spectroscopyChemistryScanning electron microscopeAnalytical chemistrySurfaces and InterfacesGeneral Chemistryengineering.materialCondensed Matter PhysicsEvaporation (deposition)Langmuir–Blodgett filmSurfaces Coatings and FilmsCorrosionX-ray photoelectron spectroscopyCoatingConversion electron mössbauer spectroscopyMaterials Chemistryengineeringdescription
Integral conversion electron Mossbauer spectroscopy (ICEMS), x-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES) and scanning electron microscopy (SEM) have been used to carry out a comparative study of the corrosion resistance against humid SO2-aggressive environments of ultrathin 57Fe films. These films, having a thickness ≤ 2.5 nm, have been prepared by evaporation of 57Fe under vacuum and by 57Fe coating by a Langmuir–Blodgett (LB) technique on SiO2/Si wafers. The results have shown that the corrosion resistance of the evaporated films is similar to that of massive Fe. However, the LB films show a remarkably higher corrosion resistance. Thus, although the Fe films prepared by evaporation have been completely corroded after 6 h of exposure to the deleterious environment, the LB films remain unaltered even after 18 h of exposure to the same aggressive conditions. The higher corrosion resistance of the LB films appears to be related to the existence of a thin surface layer containing Si, Fe2+ and Fe3+ formed on top of the Fe metal film during the thermal treatments subsequent to the LB deposition. Copyright © 2000 John Wiley & Sons, Ltd.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2000-01-01 | Surface and Interface Analysis |