Corrosion behaviour of lean duplex stainless steel in advanced oxidation process (AOP) based wastewater treatment plants

• Published in: Engineering failure analysis Vol. 136; p. 106170
• Main Authors: Nagels, Maarten, Verhoeven, Brent, Larché, Nicolas, Dewil, Raf, Rossi, Barbara
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-06-2022
• Subjects: Advanced Oxidation Process; Advanced Oxidation Processes; Alloy steel; Corrosion behaviour; Corrosive effects; Crevice corrosion; Electrochemicals; Electrochemistry; Fenton; Fenton's oxidation; Fenton's reagents; Lean Duplex stainless steel; Oxidation; Ozone; Ozone oxidation; Pitting; Process-based; Stainless steel alloys; Steel corrosion; Wastewater treatment; Electrochemistry; Ozone; Fenton; Advanced Oxidation Process; Lean Duplex stainless steel
• ISSN: 1350-6307; 1873-1961; 1873-1961
• DOI: 10.1016/j.engfailanal.2022.106170

•Localized corrosion of stainless steel alloys in wastewater treated with an AOP.•Dissolved ozone does not result in an increased pitting susceptibility.•Pitting corrosion of the studied lean duplex alloys is induced by Fenton reagents.•Crevice corrosion is observed in wastewater with both ozone and Fenton reagents.
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.