Low Cr stainless steels could represent a cost-effective alternative to high Cr alloys for use as metallic interconnects at the lower end range of Intermediate Temperature Solid Oxide Fuel Cells (IT-SOFCs). Main drawback is represented by their insufficient longterm corrosion resistance, requiring suitable corrosion protection methods to avoid both electrical contact and chrome evaporation related issues. In this work, the stability of a perovskite conversion coating applied onto a commercial 13Cr ferritic stainless steel has been evaluated during prolonged exposure at 700°C in static air atmosphere. The passivation layer was produced with a molten carbonate bath treatment that resulted in the formation of a thin-film passive layer prevalently consisting of a LaFeO3 perovskite oxide. Surface morphology and structure of the perovskite-based passive layer remained almost unchanged during 400 hour oxidation exposure thus showing promising corrosion protection ability in IT-SOFC oxidizing environments. © The Electrochemical Society.

Evaluation of a novel perovskite-based conversion coating for corrosion protection of 13cr ferritic stainless steels under relevant SOFC oxidizing conditions

Masci, A.;Frangini, S.;McPhail, S.
2015

Abstract

Low Cr stainless steels could represent a cost-effective alternative to high Cr alloys for use as metallic interconnects at the lower end range of Intermediate Temperature Solid Oxide Fuel Cells (IT-SOFCs). Main drawback is represented by their insufficient longterm corrosion resistance, requiring suitable corrosion protection methods to avoid both electrical contact and chrome evaporation related issues. In this work, the stability of a perovskite conversion coating applied onto a commercial 13Cr ferritic stainless steel has been evaluated during prolonged exposure at 700°C in static air atmosphere. The passivation layer was produced with a molten carbonate bath treatment that resulted in the formation of a thin-film passive layer prevalently consisting of a LaFeO3 perovskite oxide. Surface morphology and structure of the perovskite-based passive layer remained almost unchanged during 400 hour oxidation exposure thus showing promising corrosion protection ability in IT-SOFC oxidizing environments. © The Electrochemical Society.
9781607685395
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12079/3634
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