Electroactive marine actinomycete Nocardiopsis dassonvillei accelerates the corrosion of 5083 aluminum alloy

摘要

Microbial corrosion based on extracellular electron transfer (EET) has been widely studied on iron-based metals, however, it is still scarce for aluminum alloys. In this study, the corrosion beh avior of a novel isolated marine actinomycete, Nocardiopsis dassonvillei, against 5083 aluminum alloy (AA5083) was systematically evaluated. The results proved that N. dassonvillei biofilm accelerated AA5083 corrosion by increasing the dissolution of oxide layers through chloride accumulation, preventing the re-passivation through oxygen depletion. On metal substratum with the defected oxide film, N. dassonvillei accelerated Al dissolution by facilitating inward EET with phenazine as an electron shuttle between metal surface and bacterial cells.