Abstract
The effects of SO2 and SO3 in the environment on the hot corrosion behavior of Ni in the temperature range 750–950°C has been studied. Below the melting point of Na2SO4 (884°C), rapid corrosion takes place by formation of a Na2SO4-NiSO4 melt, which can penetrate the porous oxide scale and give rise to sulfide information by coming in contact with the metal. The distribution of the sulfides depends on the SO2 level in the ambient gas. Continued corrosion occurs by a sulfidation-oxidation mechanism. At temperatures above the melting point of Na2SO4, accelerated degradation occurs via dissolution of the surface scale, followed by reprecipitation of the oxide in a nonprotective form.
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Misra, A.K., Whittle, D.P. Effects of SO2 and SO3 on the Na2SO4 induced corrosion of nickel. Oxid Met 22, 1–33 (1984). https://doi.org/10.1007/BF00659246
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DOI: https://doi.org/10.1007/BF00659246