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In the present paper, the analysis of polishing, grinding and sand-blastingprocesses on oxidation behavior of nickel, copper and nickel-copper alloy hasbeen investigated. Surface roughness has been measured using two methods: bycontact profilometer and by fractal analysis. It has been proved thatsand-blasting process influences the surface roughness the most but alsocontaminates the surface with alumina particles. The oxidation tests wereperformed in thermogravimetrical furnace. The obtained mass gain plots, SEMmicrophotographs of cross-sections and SEM EDS analysis of the samples provethat surface preparation changes oxidation kinetics morphology of the polishedand ground samples does not vary significantly after oxidation at investigatedtemperatures, but differences in oxide layer thicknesses and mass gains wereobserved. Oxidized sandblasted samples reveal that increased surface roughnessand alumina intrusions change the oxidation process mixed Al (Ni, Cu or Ni-Cu)oxide is formed and separate Al2O3 particles are visible. The results provethat surface preparation influence high temperature oxidation of the samples bypromoting new diffusion mechanism.

The effect of surface preparation on high temperature oxidation of Ni, Cu and Ni-Cu alloy