Corrosion behavior of Limnoperna fortunei on carbon steel in freshwater environments

Résumé fourni par la source

Limnoperna fortunei ( L. fortunei ), a representative macrofouling organism in freshwater environments, causes significant degradation to the surfaces of hydraulic engineering materials through prolonged adhesion. The corrosion behavior of L. fortunei on Q345 carbon steel in river water environments was investigated employing scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM), X‐ray diffraction (XRD), Raman spectroscopy, mass loss rate analysis, electrochemical measurements, and molecular dynamics (MD) simulation, etc. The results demonstrated that the attachment of mussels decreased the overall corrosion rate of the steel surface, but significantly aggravated pitting corrosion, a highly destructive localized degradation. The corrosion behavior was primarily driven by a restricted microenvironment beneath the mussel shells, promoting localized anion enrichment, bacterial colonization, and the accumulation of aggressive secretions. These factors collectively intensified electrochemical heterogeneity, accelerating pitting initiation and propagation. The findings emphasize the urgent need for strategies to mitigate biofouling-induced localized corrosion in hydraulic engineering.

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