Pigmented Pseudoalteromonas piscicida exhibited dual effects on steel corrosion: Inhibition of uniform corrosion and induction of pitting corrosion. (September 2021)

• Record Type: Journal Article
• Authors: Guo, Zhangwei; Hui, Xinrui; Zhao, Qianyu; Guo, Na; Yin, Yansheng; Liu, Tao
• Is Part Of: Corrosion science. Volume 190(2021)
• Publication Date: 2021-09
• Subjects: Pseudoalteromonas piscicida -- Biomineralized film -- Bacterial pigment -- Marine environments -- Steel -- Pitting corrosion; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.109687
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Pigmented P. piscicida inhibits uniform corrosion via biomineralization. Pigmented P. piscicida induces pitting corrosion under the biomineralzied film. Bacterial pigments act as an electron acceptor or mediator in the process of corrosion. Abstract: Employing microorganisms to protect metal surfaces requires significant investigation before they can be translated to field applications. Here, a pigmented Pseudoalteromonas piscicida strain inhibited uniform corrosion but accelerated pitting corrosion of steel materials. The corrosion protection was attributed to a compact biomineralized film composed of calcite and EPSs. However, pitting corrosion still occurred under the film due to pigment secreted by the P. piscicida . This was further corroborated by immersing steel in an abiotic pigment medium. This study introduces a new perspective on the dual roles of bacterial pigments and biomineralization in corrosion.