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Evaluation of a biocide effect upon microbiologically influenced corrosion of mild steel

✍ Scribed by M. J. Hernández Gayosso; G. Zavala Olivares; N. Ruiz Ordaz; R. García Esquivel

Publisher
John Wiley and Sons
Year
2005
Tongue
German
Weight
185 KB
Volume
56
Category
Article
ISSN
0947-5117

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✦ Synopsis

Abstract

The microbiologically influenced corrosion (MIC) is a very dangerous process, which affects the oil industry. The activity and microorganisms' growth at the pipelines steel cause surface modifications, which can induce a more complex corrosion process. The biocide evaluation for the MIC decrease has been normally based upon microbiological tests, and just a few references mention alternating methods which can be used as criteria for their evaluation. In this work, a commercial biocide was tested, using different electrochemical laboratory techniques, to determine its effect upon a biofilm generating bacteria consortium.

Using microbiological techniques, the biocide lethal concentration was determined, and a concentration of 200 ppm was used to kill completely the consortium population in both, plancktonic and sessile parts. The electrochemical techniques: Polarisation Resistance (PR) and Electrochemical Impedance Spectroscopy (EIS), allowed describing the corrosion process associated to the microbial consortium and the biocide effect upon it.

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