Abstract
The reaction of pure nickel with 1 atm SO2 at 600–1000°C follows an irregular type of kinetics, tending to become parabolic at the highest temperature. The reaction rate tends to decrease with an increase of temperature while the scale has the same type of overall structure at all temperatures. The scales consist of an inner region of sulfide free from oxide and containing metal particles and an outer region composed of an oxide matrix containing dispersed particles of sulfide, generally extending up to the outer scale surface. The main mechanism of reation is considered to be the simultaneous formation of a mixture of oxide plus sulfide at the scale-gas interface by direct reaction of the metal with molecules of SO2. The formation of an inner layer of sulfide not containing oxide is attributed to an inward migration of sulfur through the outer duplex layer, most likely inside the network of sulfide particles.
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Gesmundo, F., de Asmundis, C. & Nanni, P. The corrosion of nickel in 1 atm of pure SO2 at 600–1000°C and the mechanism of formation of the two-layered scales. Oxid Met 20, 217–240 (1983). https://doi.org/10.1007/BF00656842
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DOI: https://doi.org/10.1007/BF00656842