Journal
CORROSION SCIENCE
Volume 164, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2019.108335
Keywords
Porous metal supports; Proton ceramic electrolyzer cells; Ferritic stainless steel; Corrosion; Coating
Funding
- Research Council of Norway (RCN) through the ENERGIX program [228819/E20, 268010/E20]
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Isothermal corrosion of coated and uncoated porous, ferritic stainless steel (Hoganas), with 20.6 wt% Cr and 30-35 % porosity, has been studied at temperatures from 600 to 800 degrees C in air and 2.5 %H2O/5 %H-2/Ar. Uncoated specimens form protective Cr2O3 scales following parabolic kinetics at 600 and 700 degrees C in air and at 800 degrees C in 2.5 %H2O/5 %H-2/Ar. Non protective scales were formed in 2.5 %H2O/5 %H-2/Ar at 600 and 700 degrees C and at 800 C in air. The coating overall improves the corrosion behavior. The scaling behavior was explained from Fe-Cr-O-2 stability diagrams and ratios between consumption and feed of Cr at the alloy-oxide interface.
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