Abstract
In this paper, an investigation of the effect of surface roughness on oxidation of polished, ground and sand-blasted samples made of iron exposed at 700 and 750 °C for 2 h in air is reported. Surface roughness was described by the 2D data sets obtained by contact profilometer and derived from microphotographs taken at three different magnifications: 100×, 200× and 500×. Surface roughness and curvature were measured by means of conventional and multiscale analysis. Oxidation behavior was analyzed in terms of mass change and SEM/BSE (scanning electron microscopy/backscattered electrons) observations. The oxidation kinetics was found to be influenced by initial surface roughness, however, its effect was different at 700 °C and 750 °C as the contribution of surface diffusion is greater at the lower temperature. It was also concluded that multiscale analysis can be successfully applied in describing surface roughness prior to high-temperature oxidation processes. The most adequate results were obtained from the data derived by contact profilometer and from microphotographs taken at the highest magnification.
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