The influence of Desulfovibrio sp. and Pseudoalteromonas sp. on the corrosion of Q235 carbon steel in natural seawater

Corrosion behavior of Q235 carbon steel is investigated in sterilized air-saturated natural seawater inoculated with mono-, and di-cultures of Desulfovibrio sp. (D. sp.) and Pseudoalteromonas sp. (P. sp.). The electrochemical and weight loss results demonstrate that the corrosion rate increases in the order: P. sp. ˂ D. sp. + P. sp. ˂ D. sp. ≈ abiotic blank. Mechanisms for the corrosion inhibition of P. sp. and the difference in the function of D. sp. in D. sp. and D. sp. + P. sp. containing media are discussed on the analysis of surface morphology, biofilm development, environmental parameters, and bacterium number.