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Corrosion of Candidate BoP Alloys for the Hydrogen Side in Alkaline Water Electrolysis

This paper presents corrosion test results of candidate alloys for balance-of-plant (BoP) at the hydrogen side in alkaline water electrolyzers. Experiments were carried out at industrially relevant conditions, i.e. 60-80 °C in 25 wt% KOH solutions at H2 pressures ranging from 1 bar (cf. atmospheric units) to 15 bar (cf. pressurized units). Materials tested were nickel base alloy UNS N06625, austenitic stainless steel UNS S31603, super duplex UNS S327X0 and carbon steel UNS K03014. Mass loss corrosion and localized corrosion based on surface profilometry were used to evaluate materials performance. Corrosion scales were characterized using XRD.
Product Number: 51324-21036-SG
Author: Morten Tjelta; Jon Kvarekvål
Publication Date: 2024
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