Pseudoalteromonas lipolytica accelerated corrosion of low alloy steel by the endogenous electron mediator pyomelanin. (January 2020)

• Record Type: Journal Article
• Authors: Liu, Tao; Pan, Shuai; Wang, Yanan; Guo, Zhangwei; Wang, Weiquan; Zhao, Qianyu; Zeng, Zhenshun; Guo, Na
• Is Part Of: Corrosion science. Volume 162(2020)
• Publication Date: 2020-01
• Subjects: Pyomelanin -- Pseudoalteromonas lipolytica -- Corrosion -- Gene deletion -- Endogenous electron mediator; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2019.108215
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: Pyomelanin produced by P. lipolytica can accelerate the corrosion rate of steel. The hmgA gene regulates the production of pyomelanin. L-tyrosine can produce more pyomelanin as a substrate. Pyomelanin acts as an endogenous electron mediator in the process of corrosion. Abstract: Endogenous electron mediators are believed to be important bridges between microorganisms and electrodes, which influence the corrosion process. In this work, the genetically engineered P. lipolytica mutant strain with hmgA gene deletion, a hmgA restoration strain and a wild-type strain were used to investigate the impact of the pyomelanin on the corrosion of steel in marine broth. Weight loss and electrochemical data demonstrated that the corrosion rate of the steel increased when the hmgA deletion strain of P. lipolytica was inoculated in marine broth to produce pyomelanin, especially with the addition of L-tyrosine as a substrate.