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

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.

Automated summary

This study examines the corrosion of lean duplex stainless steel alloys when used as construction materials in advanced oxidation processes. Electrochemical and immersion experiments were conducted using wastewater subjected to ozone or Fenton oxidation. The results of the electrochemical experiments show that the presence of dissolved ozone does not increase pitting susceptibility for any of the alloys tested. However, the application of Fenton reagents induces pitting corrosion in the studied lean duplex alloys. The immersion experiments demonstrate that crevice corrosion occurs during wastewater treatment with both ozone and Fenton reagents.