Abstract
The corrosion of Ni, Cr and NiCr (0·1–50 at.%) has been studied in the temperature range 600–1000°C using a microgravimetric apparatus with a liquid seal. The corrosion rate for 0·1 and 1% CrNi alloys was higher than that for Ni under similar conditions. Higher proportions of Cr decreased the corrosion rate considerably. All the alloys passed through a maximum corrosion rate between 700 and 800°C in maximum p SO 3 conditions. In situ visual observations were made to view nodular, dendritic and needle-growths and the liquid surface during corrosion. Au and Pt markers were used in marker studies. Electron probe and X-ray diffraction analyses indicated that the corrosion product was mainly NiO, with some Cr 2O 3, Ni 2S 3 and CrS.
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