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Electrochemical Investigation Of Alloys For Alkaline Water Electrolyzers

Picture for Electrochemical Investigation Of Alloys For Alkaline Water Electrolyzers
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Product Number: 51321-16975-SG
Author: Morten Tjelta; Simona Palencsar, Jon Kvarekvål
Publication Date: 2021
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In alkaline water electrolyzers many parts are made of expensive nickel-based alloys, which in some
cases may be an overly conservative option. Careful evaluation of the operating conditions and new
research are required to determine to which extent nickel-based alloys may be replaced by less
expensive materials in parts of the system.
Electrochemical investigations have been carried out to get a deeper understanding of corrosion and film
formation occurring on typical alloys used in alkaline electrolyzers. Potentiodynamic sweeps were
performed on carbon steel (UNS K03014) and austenitic stainless steel (UNS S31603) in 25 wt% KOH
under O2, N2 and H2 at atmospheric pressure from room temperature up to 80 °C. The gases represent
the anode side, start-up/shut-in and the cathode side, respectively. Differences between the two materials
and their response at the different conditions are discussed.

In alkaline water electrolyzers many parts are made of expensive nickel-based alloys, which in some
cases may be an overly conservative option. Careful evaluation of the operating conditions and new
research are required to determine to which extent nickel-based alloys may be replaced by less
expensive materials in parts of the system.
Electrochemical investigations have been carried out to get a deeper understanding of corrosion and film
formation occurring on typical alloys used in alkaline electrolyzers. Potentiodynamic sweeps were
performed on carbon steel (UNS K03014) and austenitic stainless steel (UNS S31603) in 25 wt% KOH
under O2, N2 and H2 at atmospheric pressure from room temperature up to 80 °C. The gases represent
the anode side, start-up/shut-in and the cathode side, respectively. Differences between the two materials
and their response at the different conditions are discussed.

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