TY - JOUR
T1 - Influence of Desulfovibrio sp. biofilm on SAE 1018 carbon steel corrosion in synthetic marine medium
AU - Pérez, Edgar Joe
AU - Cabrera-Sierra, Román
AU - González, Ignacio
AU - Ramírez-Vives, Florina
PY - 2007/9
Y1 - 2007/9
N2 - This work assessed the effect of an enriched culture medium and synthetic seawater on the growth and production of exopolymeric substances (EPS) of a Desulfovibrio sp. strain, isolated from a Mexican oil well. The EPS (mainly consisting of proteins) growth was only achieved after exposing sulfate-reducing bacteria to culture media under dissimilative conditions that predominantly promoted the growth of the biofilm and a small concentration of microorganisms. Once this EPS film was obtained, the evolution of SAE 1018 carbon steel/biofilm/synthetic seawater (VNNS medium) interface was further studied using electrochemical impedance spectroscopy technique (EIS). This study revealed strong adhesion of the biofilm during the formation of iron sulfide (pirrotite) on carbon steel surface. The biofilm inhibits the accelerated damage of the steel for some time exhibiting impedance values of 30 000 Ω. However, at longer times the chemical environment around the biofilm, as a result of microbial metabolism, may become quite corrosive to steel.
AB - This work assessed the effect of an enriched culture medium and synthetic seawater on the growth and production of exopolymeric substances (EPS) of a Desulfovibrio sp. strain, isolated from a Mexican oil well. The EPS (mainly consisting of proteins) growth was only achieved after exposing sulfate-reducing bacteria to culture media under dissimilative conditions that predominantly promoted the growth of the biofilm and a small concentration of microorganisms. Once this EPS film was obtained, the evolution of SAE 1018 carbon steel/biofilm/synthetic seawater (VNNS medium) interface was further studied using electrochemical impedance spectroscopy technique (EIS). This study revealed strong adhesion of the biofilm during the formation of iron sulfide (pirrotite) on carbon steel surface. The biofilm inhibits the accelerated damage of the steel for some time exhibiting impedance values of 30 000 Ω. However, at longer times the chemical environment around the biofilm, as a result of microbial metabolism, may become quite corrosive to steel.
KW - A. Mild steel
KW - B. EIS
KW - C. Microbiological corrosion
KW - C. Polymer coating
UR - http://www.scopus.com/inward/record.url?scp=34447521918&partnerID=8YFLogxK
U2 - 10.1016/j.corsci.2007.03.034
DO - 10.1016/j.corsci.2007.03.034
M3 - Artículo
SN - 0010-938X
VL - 49
SP - 3580
EP - 3597
JO - Corrosion Science
JF - Corrosion Science
IS - 9
ER -