Surface spectroscopic study of the corrosion of ultrathin57Fe-evaporated and Langmuir-Blodgett films in humid SO2 environments
✍ Scribed by Gracia, M.; Marco, J. F.; Gancedo, J. R.; Exel, W.; Meisel, W.
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 296 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0142-2421
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✦ Synopsis
Integral conversion electron Mössbauer 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 SO 2 -aggressive environments of ultrathin 57 Fe films. These films, having a thickness ≤2.5 nm, have been prepared by evaporation of 57 Fe under vacuum and by 57 Fe coating by a Langmuir-Blodgett (LB) technique on SiO 2 /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, Fe 2Y and Fe 3Y formed on top of the Fe metal film during the thermal treatments subsequent to the LB deposition.