Sulfidation of a Complex Nickel Base Alloy-Inconel 713C

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Abstract
The reaction between a complex high-temperature nickel-base alloy Inconel 713 C and hydrogen sulphide diluted with air was investigated in the temperature range of 705 C to 927 C under atmospheric pressure. The sulphidation in an atmosphere of 10% hydrogen sulphide between 816 C-885 C has been found to follow a parabolic-rate law with an activation energy of about 55 kcals/mole. Metallographic studies have shown that the scale is composed of two distinct layers. X-ray and electron microprobe analyses demonstrated that the outer layer is composed mainly of Ni3S2 and that the inner layer is a mixture of unidentified sulphides with chromium and aluminum as major components. The reduced rate of corrosion appears to be the result of the formation of the inner layer of scale.

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