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Title: Studies of Scale Formation and Kinetics of Crofer 22 APU and Haynes 230 in Carbon Oxide-Containing Environment for SOFC Applications

Abstract

Significant progress in reducing the operating temperature of SOFCs below 800oC may allow the use of chromia-forming metallic interconnects at a substantial cost savings. Hydrogen is the main fuel for all types of fuel cells except direct methanol fuel cells. Hydrogen can be generated from fossil fuels, including coal, natural gas, diesel, gasoline, other hydrocarbons, and oxygenates (e.g., methanol, ethanol, butanol, etc.). Carbon oxides present in the hydrogen fuel can cause significant performance problems due to carbon formation (coking). Also, literature data indicate that in CO/CO2 gaseous environments, metallic materials that gain their corrosion resistance due to formation of Cr2O3, could form stable chromium carbides. The chromium carbide formation causes depletion of chromium in these alloys. If the carbides oxidize, they form non-protective scales. Considering a potential detrimental effect of carbon oxides on iron- and nickel-base alloy stability, determining corrosion performance of metallic interconnect candidates in carbon oxide-containing environments at SOFC operating temperatures is a must. In this research, the corrosion behavior of Crofer 22 APU and Haynes 230 was studied in a CO-rich atmosphere at 750°C. Chemical composition of the gaseous environment at the outlet was determined using gas chromatography (GC). After 800 h of exposure to the gaseousmore » environment the surfaces of the corroded samples were studied by scanning electron microscopy (SEM) equipped with microanalytical capabilities. X-ray diffraction (XRD) analysis was also used in this study.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
Sponsoring Org.:
USDOE - Office of Fossil Energy (FE)
OSTI Identifier:
912710
Report Number(s):
DOE/NETL-2007-043
R&D Project: 220693; TRN: US200801%%1158
Resource Type:
Conference
Resource Relation:
Conference: Fuel Cell Seminar, Honolulu, HI, Nov. 13-17, 2006; Related Information: Extended abstract only published
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CARBON; CARBON OXIDES; CHEMICAL COMPOSITION; CHROMIUM CARBIDES; CORROSION RESISTANCE; DIRECT METHANOL FUEL CELLS; FOSSIL FUELS; FUEL CELLS; GAS CHROMATOGRAPHY; HYDROCARBONS; HYDROGEN FUELS; KINETICS; NATURAL GAS; NICKEL BASE ALLOYS; SCANNING ELECTRON MICROSCOPY; SOLID OXIDE FUEL CELLS; X-RAY DIFFRACTION; materials science; engineering; synthetic fuels; energy conservation

Citation Formats

Ziomek-Moroz, M, Covino, Jr, B S, Holcomb, G R, Bullard, S J, and Penner, L R. Studies of Scale Formation and Kinetics of Crofer 22 APU and Haynes 230 in Carbon Oxide-Containing Environment for SOFC Applications. United States: N. p., 2006. Web.
Ziomek-Moroz, M, Covino, Jr, B S, Holcomb, G R, Bullard, S J, & Penner, L R. Studies of Scale Formation and Kinetics of Crofer 22 APU and Haynes 230 in Carbon Oxide-Containing Environment for SOFC Applications. United States.
Ziomek-Moroz, M, Covino, Jr, B S, Holcomb, G R, Bullard, S J, and Penner, L R. Sun . "Studies of Scale Formation and Kinetics of Crofer 22 APU and Haynes 230 in Carbon Oxide-Containing Environment for SOFC Applications". United States. doi:. https://www.osti.gov/servlets/purl/912710.
@article{osti_912710,
title = {Studies of Scale Formation and Kinetics of Crofer 22 APU and Haynes 230 in Carbon Oxide-Containing Environment for SOFC Applications},
author = {Ziomek-Moroz, M and Covino, Jr, B S and Holcomb, G R and Bullard, S J and Penner, L R},
abstractNote = {Significant progress in reducing the operating temperature of SOFCs below 800oC may allow the use of chromia-forming metallic interconnects at a substantial cost savings. Hydrogen is the main fuel for all types of fuel cells except direct methanol fuel cells. Hydrogen can be generated from fossil fuels, including coal, natural gas, diesel, gasoline, other hydrocarbons, and oxygenates (e.g., methanol, ethanol, butanol, etc.). Carbon oxides present in the hydrogen fuel can cause significant performance problems due to carbon formation (coking). Also, literature data indicate that in CO/CO2 gaseous environments, metallic materials that gain their corrosion resistance due to formation of Cr2O3, could form stable chromium carbides. The chromium carbide formation causes depletion of chromium in these alloys. If the carbides oxidize, they form non-protective scales. Considering a potential detrimental effect of carbon oxides on iron- and nickel-base alloy stability, determining corrosion performance of metallic interconnect candidates in carbon oxide-containing environments at SOFC operating temperatures is a must. In this research, the corrosion behavior of Crofer 22 APU and Haynes 230 was studied in a CO-rich atmosphere at 750°C. Chemical composition of the gaseous environment at the outlet was determined using gas chromatography (GC). After 800 h of exposure to the gaseous environment the surfaces of the corroded samples were studied by scanning electron microscopy (SEM) equipped with microanalytical capabilities. X-ray diffraction (XRD) analysis was also used in this study.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}

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