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A systematic comparison study was carried out to investigate the effect of  Flavobacterium  sp. on AISI 1045 steel corrosion by weight loss, fluorescence microscopy (FM), surface analysis, cell count, pH measure, electrochemical impedance spectroscopy (EIS), and polarization curves. The impedances were considerably increased by  Flavobacterium  sp. between 1 and 7 day exposure and after 30 day exposure but considerably decreased by  Flavobacterium  sp. after 15 and 21 day exposure, which were supported by the I corr  results and the weight loss data. Furthermore, the biofilm was formed on the coupons. The pH values were considerably decreased by  Flavobacterium  sp. after 15 and 21 day exposure. The results proved that  Flavobacterium  sp. decreased the corrosion rates between 1 and 7 day exposure and after 30 day exposure and increased the corrosion rates between 15 and 21 day exposure, which could be ascribed to the protective biofilm and the secreted corrosive acid, respectively. In addition,  Flavobacterium  sp. considerably increased the pit numbers, the maximum pit depths, and the corresponding widths and considerably decreased the E pit  values. Importantly, the coverage and the heterogeneity of the biofilm were positively correlated with the increases in the maximum pit depths and the corresponding widths and the decreases in the E pit  values by  Flavobacterium  sp. The results demonstrated that  Flavobacterium  sp. increased the pitting corrosion, which could involve the heterogeneous biofilm cover.

Corrosion Behavior of AISI 1045 Steel in Seawater in the Presence of Flavobacterium sp.