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International Journal of Corrosion
Volume 2011 (2011), Article ID 415920, 6 pages
Research Article

Formation of Biofilms and Biocorrosion on AISI-1020 Carbon Steel Exposed to Aqueous Systems Containing Different Concentrations of a Diesel/Biodiesel Mixture

1Escola de Química, Universidade Federal do Rio de Janeiro, Avenida Athos da Silveira Ramos 149, Bl E, Sl E-109, 21941-909 Rio de Janeiro, RJ, Brazil
2Departamento de Engenharia Mecânica, Universidade Federal de Pernambuco, Avenida Professor Moraes Rego 1235, Cidade Universitária, 50670-901 Recife, PE, Brazil
3Gerência de Meio Ambiente, Petróleo Brasileiro SA, Avenida Almirante Barroso 81, 23 Andar, 20031-004 Rio de Janeiro, RJ, Brazil

Received 5 July 2011; Revised 8 September 2011; Accepted 9 September 2011

Academic Editor: Flavio Deflorian

Copyright © 2011 Ivanilda Ramos de Melo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Environmental and economic concerns accelerated biofuels research and industrial production. Many countries have been using diesel and biodiesel blends as fuels justifying research on biofilms formation and metals corrosion. Cylinders made of AISI-1020 carbon steel with an exposed area of 1587 mm2, water, and water associated with B3 fuel (diesel/biodiesel blend at 97 : 3 v/v) were used.The formation of biofilms was detected, and biocorrosion was detected on AISI-1020. The results showed a variation in sessile microflora during the experiments. In the biofilms, a significant concentration of aerobic, anaerobic, IOB, Pseudomonas aeruginosa, and sulfate-reducing bacteria was observed. The corrosion rates varied between and  mm/year, depending on the experimental conditions. The main corrosion products identified were various forms of FeOOH, magnetite, and all forms of FexSy. In systems where there were high levels of sulfate reducing bacteria, corrosion pits were observed. In addition, the aliphatic hydrocarbons present in the fluid containing 10% B3 were totally degraded.