Laboratory investigation of the microbiologically influenced corrosion (MIC) resistance of a novel Cu-bearing 2205 duplex stainless steel in the presence of an aerobic marine Pseudomonas aeruginosa biofilm

Abstract

The microbiologically influenced corrosion (MIC) resistance of a novel Cu-bearing 2205 duplex stainless steel (2205 Cu-DSS) against an aerobic marine Pseudomonas aeruginosa biofilm was investigated. The electrochemical test results showed that R_p increased and i_corr decreased sharply after long-term immersion in the inoculation medium, suggesting that 2205 Cu-DSS possessed excellent MIC resistance to the P. aeruginosa biofilm. Fluorescence microscope images showed that 2205 Cu-DSS possessed a strong antibacterial ability, and its antibacterial efficiency after one and seven days was 7.75% and 96.92%, respectively. The pit morphology comparison after 14 days between 2205 DSS and 2205 Cu-DSS demonstrated that the latter showed a considerably reduced maximum MIC pit depth compared with the former (1.44 μm vs 9.50 μm). The experimental results suggest that inhibition of the biofilm was caused by the copper ions released from the 2205 Cu-DSS, leading to its effective mitigation of MIC by P. aeruginosa.

Keywords:

• 2205 Cu-DSS
• Pseudomonas aeruginosa
• MIC
• biofilm
• antimicrobial

Conflict of interest disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This study was financially supported by the Young Merit Scholars program by the National Basic Research Program of China [973 Program No. 2014CB643300], the National Environmental Corrosion Platform (NECP) and by the Young Merit Scholars program of the Institute of Metal Research, Chinese Academy of Sciences.