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Corrosion of Candidate Materials for Alkaline Water Electrolysis

In alkaline water electrolysis the capital expense (CAPEX) of the electrolyser unit is high and cost reduction wherever possible is highly desired. 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 may reveal that expensive alloys may be replaced by cheaper ones in parts of the system.In this paper the corrosion behaviour of candidate materials relevant for use in atmospheric and pressurizedalkaline water electrolysis systems is evaluated at typical operating conditions (i.e. 1-30 bar pressure 60‑80°C and 25 wt% KOH. The materials tested are one nickel base alloy (UNS N06625) one austenitic stainless steel (UNS S31603) one super duplex stainless steel (UNS S327X0) and one carbon steel (UNS K03014).Performance is evaluated based on mass loss corrosion and localized corrosion based on surface profilometry. Corrosion scales and their protectiveness are evaluated based on analysis using SEM/EDS and XRD. Also the different materials are compared using electrochemical techniques (critical pitting potential critical pitting temperature) as a function of temperature and oxygen partial pressure.

Product Number: 51319-13297-SG
Author: Morten Tjelta
Publication Date: 2019
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