Alloy degradation under oxidizing-sulfidizing conditions at elevated temperatures

Materials Research

Brian Gleeson¹ 

关键词: sulfidation;    thermodynamics;    kinetic boundary;    breakaway;    critical microstructure;   

DOI  :  10.1590/S1516-14392004000100010

来源: SciELO

【 摘 要 】

Exposure of high-temperature alloys to a low-P O2 oxidizing-sulfidizing environment above about 550 °C is often characterized by an initial period of protective oxidation followed by more rapid corrosion. This paper will provide a brief overview of alloy corrosion in oxidizing-sulfidizing atmospheres, with specific consideration given to the thermodynamic and kinetic aspects of the process, resulting modes of degradation, and alloy selection. The concept of a "critical microstructure" in the subsurface of the alloy as a prerequisite to initiating protective scale breakdown will also be discussed. The paper will conclude with a specific example of alloy development for the filtration of hot oxidizing-sulfidizing gases.

【 授权许可】

CC BY   
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