Characterization of surface oxides by Raman spectroscopy☆
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Beneficial effect of cold-working on high temperature oxidation resistance of austenitic stainless steel
2019, Corrosion ScienceCitation Excerpt :However (Cr,Fe)2O3 grains of the pre-strained sample appear to be finer (Fig. 3d) than the as-received one (Fig. 3c). This observation is in agreement with Raman spectroscopy spectra where the contribution at 681 cm−1, attributed to MnCr2O4 [29] is slightly smaller for the pre-strained sample (Fig. 2). Cooper et al. observed that sandblasting and cold-rolling decrease the relative amount of spinel for ferritic stainless steels oxidized at 800 °C in air for 502 h [18].
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2019, Materials Science and Engineering CCitation Excerpt :The broad phonon band at 585 cm−1 (Fig. 2c) typical of 1LO mode of NiO is detected and the other bands representative of NiO is least detected in Raman spectra, which is attributed to the reduced optical absorption coefficient value. The observed minor shift in NiO bands towards lower wavenumber is mainly due to the difference in vibrational frequency contributed by the presence of additional oxide phases [68,69]. Fig. 2d revealed the presence of optical phonon bands respective of various vibrations of Co3O4.
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2019, International Journal of Hydrogen EnergyCharacterization and wear of oxides formed on CoCrMoSi alloy coatings
2017, Surface and Coatings TechnologyCitation Excerpt :At 750 °C, peaks can also be observed at 356 cm− 1 and 551 cm− 1, both of which correspond to Cr2O3. The former was described in a study by R.L. Farrow et al. that investigated the composition and structure of surface films formed on FeNiCr alloy specimens exposed to temperatures up to 850 °C [21], and the latter is described in RRUFF record number R060892. The coatings surface and the oxides formed under different temperatures resulted on changes on the abrasive wear performance as observed from the change in wear scar volume with rolling distance in Fig. 7.
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Paper presented at the International Conference on Metallurgical Coatings, San Diego, California, U.S.A., April 21–25, 1980.