Ce addition enhances the microbially induced corrosion resistance of Cu-bearing 2205 duplex stainless steel in presence of sulfate reducing bacteria

Highlights: • A novel antibacterial 2205-Cu-Ce DSS is designed. • Cu and Ce exhibit a strong antibacterial effect against corrosive SRB biofilm. • Pitting corrosion caused by SRB is effectively mitigated by 2205-Cu-Ce DSS. • Critical Ce amount (0.18 wt.%) in DSS to inhibit MIC is determined. Influences of Ce additions (0.08, 0.18 and 0.30 wt.%) on microbiologically influenced corrosion of Cu-bearing 2205 duplex stainless steel (DSS) were investigated through surface analysis and electrochemical measurements during 14-day exposure to a strain of corrosive sulfate reducing bacterium, Desulfovibrio desulfuricans. Results demonstrate the addition of Ce over 0.18 wt.% effectively inhibited the formation of SRB biofilm on surface of 2205-Cu-Ce DSS, and decreased the corrosion tendency to a great degree, indicating that Ce addition over a critical value can significantly enhance antibacterial effect of Cu-bearing 2205 DSS against SRB induced corrosion.