Work

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

Year: 1987

Type: article

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.

Source: Journal of The Electrochemical Society

DOI: 10.1149/1.2100790

Author: Alan P. Brown

Institution: Argonne National Laboratory

Language: English

Topic: Corrosion Behavior and Inhibition

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: bronze

Funders: U.S. Department of Energy, Argonne National Laboratory

Awards: G18202666, G1940553382