Abstract
The sulfldation kinetics of a Ni‐20 w/o (weight per cent) Cr alloy exposed to hydrogen sulfide‐hydrogen atmospheres at 700°C have been determined as a function of the sulfur pressure. The morphology and phase composition of the duplex sulfide scale formed as a corrosion product have been investigated. The kinetics appear to be controlled by diffusion of the reactants through the scale. No significant dependence of the parabolic rate constant on the sulfur pressure has been determined within the wide range . A correlation is presented for the growth kinetics and the structural features of the nickel and chromium sulfide constituents of the scales with the ternary nickel‐chromium‐sulfur phase diagram.
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