11196 Effects of Ceria Coatings on Materials Performance of 430 Steel in Coal Synthetic Gas

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Product Number: 51300-11196-SG

ISBN: 11196 2011 CP

Author: Margaret Ziomek-Moroz and Paul Jablonski

Publication Date: 2011

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Carbon, which is a reaction product of various reactions occurring in syngas at SOFC operating temperatures, can diffuse into metallic materials and cause carbon-induced corrosion (CIC) in the form of carburization or metal dusting. Therefore, The U.S. Department of Energy, National Energy Technology Laboratory is investigating susceptibility of 430-based stainless steel for the SOFC interconnect applications. The 430 stainless steel was modified in-house by reducing the amounts of silicon and aluminum. Also, the surfaces of some coupons were treated with ceria.

In this research, the surfaces of low silicon and aluminum 430 stainless steel coupons with and without ceria surface treatment were investigated after exposure to simulated coal syngas-based fuel at 800oC. The results of X-ray diffraction (XRD) and microscopic investigations indicate oxide formation for ceria treated and untreated coupons. Higher carbon content was detected by the LECO combustion analysis for ceria treated coupons than for bare coupons. Also, the Fe-rich particles formed on the ceria treated coupons. The results indicate a different mechanism of carburization for the ceria treated steel than that for the untreated steel.

Key words: ferritic stainless steels, coal synthetic gas, carbon-induced corrosion