Influence of multispecies biofilms of Pseudomonas aeruginosa and Desulfovibrio vulgaris on the corrosion of cast iron

The impact of biofilm formation and bacterial solutions of Desulfovibrio vulgaris (a sulfate reducing bacteria, SRB) and Pseudomonas aeruginosa (PAO1, denitrifying bacteria) on the corrosion of cast iron was assessed and compared in this study. Corrosion experiments were separately conducted in respective culture media (in-situ) and in 3.5% NaCl (ex-situ, pH 4). The extent of cast iron corrosion diminishes in the co-presence of PAO1 and SRB compared to SRB alone. However, patchy and scanty biofilms of PAO1 did not protect the surface in 3.5% NaCl solution compared to SRB biofilms. (C) 2017 Elsevier Ltd. All rights reserved.