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Título del libro: Biofilms: Formation, Development And Properties
Título del capítulo: Electrochemical modification of the metal/electrolyte interface generated by the formation of biofilm

Autores UNAM:
CARLOS EDGAR RODRIGUEZ GONZALEZ; FRANCISCO JAVIER RODRIGUEZ GOMEZ;
Autores externos:

Idioma:
Inglés
Año de publicación:
2011
Palabras clave:

Biofilm; Corrosion; Electrochemical techniques; Inhibitor


Resumen:

Microorganisms are able to modify the electrochemical conditions in the metal/solution interface with biofilm formation. They cause the induction, acceleration or inhibition of corrosion. Within the biofilm adhered to the metal substrate, complex interactions are developed with the corrosion products. The mechanisms associated with corrosion and inhibitions influenced by microorganisms, are rarely generated by a single species of bacteria. In the case of corrosion inhibition, this may be due to neutralizing the action of corrosive substances present in the environment, or the formation of protective films before the development of biofilm. The corrosive action depends on the type of bacteria, the bacterial consortium, their development, and environmental conditions. Different practical cases illustrating these mechanisms are presented in this research. In the first case, the formation of an aerobic bacterial consortium was studied by electrochemical techniques (open circuit potencial, OCP, and electrochemical impedance spectroscopy, EIS) on biofilms and its effect on low-carbon steel. In the second case, the behavior of sulphatereducing bacteria (SRB) in different nutritional media was monitotored by applying the technique of electrochemical noise (EN), analyzing interactions between the metallic substrate and the biofilm. Finally, a study on the presence of an organic corrosion inhibitor in the presence of SRB is shown using EN, determining effect on the development of biofilm. The damage caused by the metal substrate interactions on the biofilm were observed by scanning electron microscope (MEB). © 2011 Nova Science Publishers, Inc. All Rights Reserved.


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