Rhamnolipid as an eco-friendly corrosion inhibitor for microbiologically influenced corrosion. (1st August 2022)

• Record Type: Journal Article
• Authors: Li, Zhong; Yuan, Xinyi; Sun, Mingyue; Li, Zhengtao; Zhang, Danni; Lei, Yuhao; Zhang, Mingxing; Fan, Yongqiang; Xu, Dake; Wang, Fuhui
• Is Part Of: Corrosion science. Volume 204(2022)
• Publication Date: 2022-08-01
• Subjects: Rhamnolipid -- Microbiologically influenced corrosion -- Corrosion inhibitor -- Biosurfactant -- Carbon steel; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110390
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: The development of sustainable and non-toxic corrosion inhibitors attracts much attentions. Herein, the rhamnolipid (RH) produced by Pseudomonas aeruginosa was found to effectively inhibit the corrosion of X70 carbon steel in simulated seawater. Moreover, RH was verified to protect X70 carbon steel against the microbiologically influenced corrosion (MIC) caused by Bacillus licheniformis, a typical corrosive bacterium. The addition of 0.1% (m/v) RH reduced the corrosion current density by 68.4% in the presence of B. licheniformis compared with untreated condition. The growth of B. licheniformis was significantly inhibited with RH concentration higher than 125 mg/L. The antimicrobial and corrosion inhibition effects make RH suitable for MIC inhibition. Graphical Abstract: ga1 Highlights: Rhamnolipid (RH) synthesized by P. aeruginosa is identified as a green corrosion inhibitor. Corrosion of X70 steel caused by B. licheniformis is inhibited by RH. RH inhibits bacterial growth and increases surface hydrophilicity of X70 carbon steel.