Dual-environment effects on the oxidation of metallic interconnects

Journal Article · Tue Aug 01 04:00:00 EDT 2006 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1361/105994906X117198· OSTI ID:923060

Holcomb, G R; Ziomek-Moroz, M; Covino, Jr, B S; Bullard, S J

Metallic interconnects in solid oxide fuel cells are exposed to a dual environment: fuel on one side (i.e., H2 gas) and oxidizer on the other side (i.e., air). It has been observed that the oxidation behavior of thin stainless steel sheet in air is changed by the presence of H2 on the other side of the sheet. The resulting dual-environment scales are flaky and more friable than the single-environment scales. The H2 disrupts the scale on the air side. A model to explain some of the effects of a dual environment is presented where hydrogen diffusing through the stainless steel sheet reacts with oxygen diffusing through the scale to form water vapor, which has sufficient vapor pressure to mechanically disrupt the scale. Experiments on preoxidized 316L stainless steel tubing exposed to air-air, H2-air, and H2-Ar environments are reported in support of the model.

• Research Organization: Albany Research Center (ARC), Albany, OR; National Energy Technology Laboratory (NETL), Pittsburgh, PA, and Morgantown, WV
• Sponsoring Organization: USDOE - Office of Fossil Energy (FE)
• OSTI ID: 923060
• Report Number(s): DOE/NETL-IR-2006-136
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 4 Vol. 15; ISSN 1544-1024; ISSN 1059-9495
• Publisher: ASM International; Materials Park, OH
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
36 MATERIALS SCIENCE
AIR
HYDROGEN
OXIDATION
OXIDIZERS
OXYGEN
SOLID OXIDE FUEL CELLS
STAINLESS STEELS
VAPOR PRESSURE
WATER VAPOR
dual environment
hydrogen
interconnect
oxidation
solid oxide fuel cell
stainless steel