Enhanced corrosion of 7075 alloy by the presence of Bacillus megaterium
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Archivos
Fecha
2016
Profesor/a Guía
Facultad/escuela
Idioma
en
Título de la revista
ISSN de la revista
Título del volumen
Editor
Electrochemical Science Group
Nombre de Curso
Licencia CC
Licencia CC
Resumen
A Bacillus megaterium strain with corrosive properties was isolated from a bacterial community
collected from the drain valve of a C130 aircraft principal fuel tank. This strain and the consortium
present in the valve were studied microbiologically and electrochemically to evaluate the risk of
corrosion. Aluminum alloy 7075 was used as a substrate and the corrosion behavior was studied in
sterile minimal salt medium (MSM) as a function of immersion time. The isolation and
characterization of the consortium by DNA sequencing showed that the bacterium with corrosive
properties is closely related to B. megaterium. Electrochemical results revealed that the corrosion rate
was not influenced in sterile and inoculated media with the consortium. However, a corrosive behavior
was determined in presence of the isolated B. megaterium strain after 14 days immersion time. The
effect might be related to interfacial local pH changes by oxygen reduction to OH ions. Further, SEM
examinations and EDX analysis of metallic samples exposure in inoculated media showed localized
attacks.
Notas
Indexación: Scopus.
Palabras clave
Microbiologically Influenced Corrosion, Biocorrosion, Aluminum Alloy, 7075, Bacillus Megaterium
Citación
International Journal of Electrochemical Science. Volume 11, Issue 11, Pages 9723 - 9733. 2016
DOI
10.20964/2016.11.33