The corrosion behavior of ferritic, stainless steel, iron-nickel-chromium and nickel-base alloys was investigated in H2-80%CO at 621°C. Mass change and rate of mass loss, pit depth progression rate and pit distribution were monitored and recorded. It was found that wastage rates and pit depth progression rates were generally much lower for nickel-base alloys than iron-base alloys. Pit depth did not necessarily correlate with area averaged mass change rate, Chromium, silicon and aluminum additions were found to be beneficial in producing an oxide scale which reduced or prevented wastage due to metal dusting.
Keywords: iron-nickel-chromium alloys, stainless steels, ferritic steels, nickel-base alloys, metal dusting, carburization