Enhanced corrosion of 7075 alloy by the presence of Bacillus megaterium

Nelson D. Vejar, Juan Sacre, Bernardo Collao, José Perez-Donoso, Maritza A. Páez, Fabiola Pineda, Benjamin Worker, Mamie Sancy

Resultado de la investigación: Article

1 Cita (Scopus)

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.

Idioma originalEnglish
Páginas (desde-hasta)9723-9733
Número de páginas11
PublicaciónInternational Journal of Electrochemical Science
Volumen11
N.º11
DOI
EstadoPublished - 1 ene 2016

Huella dactilar

Bacilli
Corrosive effects
Corrosion
Fuel tanks
Caustics
Corrosion rate
Energy dispersive spectroscopy
Aluminum alloys
Bacteria
DNA
Salts
Aircraft
Ions
Oxygen
Scanning electron microscopy
Substrates

ASJC Scopus subject areas

  • Electrochemistry

Citar esto

Vejar, Nelson D. ; Sacre, Juan ; Collao, Bernardo ; Perez-Donoso, José ; Páez, Maritza A. ; Pineda, Fabiola ; Worker, Benjamin ; Sancy, Mamie. / Enhanced corrosion of 7075 alloy by the presence of Bacillus megaterium. En: International Journal of Electrochemical Science. 2016 ; Vol. 11, N.º 11. pp. 9723-9733.
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title = "Enhanced corrosion of 7075 alloy by the presence of Bacillus megaterium",
abstract = "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.",
keywords = "7075, Aluminum alloy, Bacillus megaterium, Biocorrosion, Microbiologically influenced corrosion",
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Vejar, ND, Sacre, J, Collao, B, Perez-Donoso, J, Páez, MA, Pineda, F, Worker, B & Sancy, M 2016, 'Enhanced corrosion of 7075 alloy by the presence of Bacillus megaterium', International Journal of Electrochemical Science, vol. 11, n.º 11, pp. 9723-9733. https://doi.org/10.20964/2016.11.33

Enhanced corrosion of 7075 alloy by the presence of Bacillus megaterium. / Vejar, Nelson D.; Sacre, Juan; Collao, Bernardo; Perez-Donoso, José; Páez, Maritza A.; Pineda, Fabiola; Worker, Benjamin; Sancy, Mamie.

En: International Journal of Electrochemical Science, Vol. 11, N.º 11, 01.01.2016, p. 9723-9733.

Resultado de la investigación: Article

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T1 - Enhanced corrosion of 7075 alloy by the presence of Bacillus megaterium

AU - Vejar, Nelson D.

AU - Sacre, Juan

AU - Collao, Bernardo

AU - Perez-Donoso, José

AU - Páez, Maritza A.

AU - Pineda, Fabiola

AU - Worker, Benjamin

AU - Sancy, Mamie

PY - 2016/1/1

Y1 - 2016/1/1

N2 - 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.

AB - 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.

KW - 7075

KW - Aluminum alloy

KW - Bacillus megaterium

KW - Biocorrosion

KW - Microbiologically influenced corrosion

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