An investigation was undertaken to study the influence of nickel on the high temperature corrosion of boiler construction alloys in steam. A series of laboratory experiments were carried out where 2-1/4 Cr-1 Mo steels containing 1-5 wt % Ni were oxidized at 550, 650 and 800°C in steam and air. It was found that the scaling process of the test materials followed a parabolic rate law. The oxide phases identified on the scales consisted of hematite, magnetite and wustite. At 550°C, the rate of corrosion increased slightly with the amount of nickel present. At the temperatures 650 and 800°C, the oxidation rate of the test materials decreased significantly with nickel. This decrease can be attributed to the formation of an internal oxidation zone which develops due to nickel accumulation in the metal at the metal-scale interface.

Subject
Materials, Corrosion rate, Nickel based alloys, Oxide formation, Oxide layers, Corrosion scales, Oxide scales, Interfaces, Scale formation, Steel, Nickel, Steam, Oxidation
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1982
Association for Materials Protection and Performance (AMPP)
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