Copper Iron Conversion Coating for Solid Oxide Fuel Cell Interconnects

• A conversion coating of iron and copper was investigated with the purpose of increasing the performance of Sanergy HT as a potential SOFC interconnect material. Samples were exposed to a simulated cathode atmosphere (air, 3 % H2O) for durations of up to 1000 h at 850 °C. Their performance in terms of corrosion, chromium evaporation and electrical resistance (ASR) was monitored and compared to uncoated and cobalt-coated Sanergy HT samples. The copper iron coating had no negative effects on corrosion protection and decreased chromium evaporation by about 80%. An Area Specific Resistance (ASR) of 10 mΩcm2 was reached after 1000 h of exposure. Scanning Electron Microscopy revealed well adherent oxide layers comprised of an inner chromia layer and an outer spinel oxide layer.

Ämnesord

NATURVETENSKAP  -- Kemi -- Oorganisk kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)

Nyckelord

Metal coatings

Electrical resistances

Evaporation

Solid oxide fuel cells (SOFC)

Corrosion

Chromia layers

Sanergy HT

Chromium volatilization

Conversion coatings

Coatings

Copper

Scanning electron microscopy

Chromium

Interconnect

SOFC

Area-specific resistances

Area specific resistance

Spinel oxide

Sofc interconnect

Fuel cells

Iron

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