The Corrosion Behavior of Molybdenum and Hastelloy B in Sulfur and Sodium Polysulfides at 623 K

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Abstract
An experimental study was completed to determine the corrosion behavior of molybdenum and Hastelloy B, a nickel‐based alloy with high molybdenum content, in sulfur and sodium polysulfides (, , ), at 623 K. In sulfur, molybdenum corrodes very slowly, with a parabolic rate constant of ; Hastelloy B shows no measurable corrosion after 100h of exposure to sulfur. The corrosion reaction of molybdenum in is characterized by the formation of a protective film that effectively eliminates further corrosion after the first 100h of exposure. Hastelloy B, however, corrodes rapidly in , with corrosion rates approaching those of pure nickel under the same conditions. After the first 4h of exposure, the kinetics for the corrosion of Hastelloy B in follows a linear rate law. The scale morphology has multiple spalled layers of , with some crystallites of appearing on the leading face of the scale and between the individual scale layers. This spalling causes smaller coupons of the Hastelloy B to corrode faster than larger coupons.

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