Corrosion behaviour of lean duplex stainless steel in advanced oxidation process (AOP) based wastewater treatment plants
By Nagels, Maarten; Verhoeven, Brent; Larché, Nicolas; Dewil, Raf; Rossi, Barbara
Published in Engineering Failure Analysis
2022
Abstract
The corrosion of lean duplex stainless steel alloys is examined when applied as a construction material in advanced oxidation processes. Both electrochemical and immersion experiments have been carried out when subjecting wastewater to ozone or Fenton oxidation. The electrochemical experiments suggest that the presence of dissolved ozone at the levels tested does not result in an increased pitting susceptibility for none of the alloys included in the research. However, the application of Fenton reagents induces pitting corrosion to the studied lean duplex alloys. The immersion experiments highlight that crevice corrosion occurs during wastewater treatment with both ozone and Fenton reagents.