Abstract
The high-temperature corrosion behavior of Rene 80 Superalloy was studied over the temperature range 600-800℃ in H2/H2S and H2/H2S/H2O gas mixtures. In general, the corrosion kinetics followed the parabolic rate law, the corrosion rate constants increased with increasing temperature. The scales formed on Rene 80 were duplex, consisting of an outer layer of Ni3S2 and some Co9S8Co6S5, and an inner layer of mostly Cr2S3/Cr3S4, some NiCr2S4, CoCr2S4, and Ni3S2. The position of Pt-marker was always located at the inner- and outer-layer boundary, suggesting that the outer layer grew by outward diffusion of cations and the inner layer formed by means of inward diffusion of sulfur.
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