Enhanced inhibition of HEDP on SRB-mediated corrosion with D-phenylalanine.

Hongyi Li, Zhengyan Kang, Kaixin Zhang, Shichu Gong, Xinxin Zhao, Zhen Yan, Shuguang Wang, Chao Song

Environmental research 2023 Jun 15

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Microbiologically influenced corrosion (MIC) caused by biofilm is a serious problem in many industries. D-amino acids could be a potential strategy to enhance traditional corrosion inhibitors due to their roles in biofilm reduction. However, the synergistic mechanism of D-amino acids and inhibitors remains unknown. In this study, D-Phenylalanine (D-Phe) and 1-hydroxyethane-1,1-diphosphonic acid (HEDP) were selected as the typical D-amino acid and corrosion inhibitor to evaluate their effect on the corrosion caused by Desulfovibrio vulgaris. The combination of HEDP and D-Phe obviously slowed down the corrosion process by 32.25%, decreased the corrosion pit depth and retarded cathodic reaction. SEM and CLSM analysis indicated that D-Phe reduced the content of extracellular protein and thus inhibited the biofilm formation. The molecular mechanism of D-Phe and HEDP on corrosion inhibition was further explored via transcriptome. The combination of HEDP and D-Phe down-regulated the gene expression of peptidoglycan, flagellum, electron transfer, ferredoxin and quorum sensing (QS) molecules, leading to less peptidoglycan synthesis, weaker electron transfer and stronger QS factor inhibition. This work provides a new strategy for improving traditional corrosion inhibitors, retarding MIC and mitigating subsequent water eutrophication. Copyright © 2023 Elsevier Inc. All rights reserved.

Citation

Hongyi Li, Zhengyan Kang, Kaixin Zhang, Shichu Gong, Xinxin Zhao, Zhen Yan, Shuguang Wang, Chao Song. Enhanced inhibition of HEDP on SRB-mediated corrosion with D-phenylalanine. Environmental research. 2023 Jun 15;227:115754