Effect of Pseudomonas fluorescens on the electrochemical behaviour of a single-phase Cu-Sn modern bronze

[Display omitted] The corrosion behavior of a modern bronze (12 wt% Sn) is studied during 100 h of exposure to a Pseudomonas fluorescens culture. Bacteria colonization, preferentially occurring in the form of black spots, caused an ennoblement of the open circuit potential and a decrease of the pitt...

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Published inCorrosion science Vol. 139; pp. 227 - 234
Main Authors Ghiara, G., Spotorno, R., Trasatti, S.P., Cristiani, P.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier Ltd 15.07.2018
Elsevier BV
Subjects
Alloys
Bacteria
Bacterial corrosion
Charge transfer
Copper
Copper chloride
Copper tin alloy
Corrosion
Corrosion potential
EIS
Electrochemical analysis
Microbiological corrosion
Open circuit voltage
Passive films
Pitting (corrosion)
Pitting potential
Polarization
Pseudomonas fluorescens
Raman spectroscopy
Scanning electron microscopy
SEM
Tin bronzes
Tin zinc alloys
Polarization
Passive films
Copper tin alloy
SEM
Microbiological corrosion
Raman spectroscopy
EIS
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Summary:[Display omitted] The corrosion behavior of a modern bronze (12 wt% Sn) is studied during 100 h of exposure to a Pseudomonas fluorescens culture. Bacteria colonization, preferentially occurring in the form of black spots, caused an ennoblement of the open circuit potential and a decrease of the pitting potential. Eriochalcite (CuCl2*2H2O) and Nantokite (CuCl) were found in the micro-pits detected under the biofilm, associated to a local pH decrease. Electrochemical measurements via impedance spectroscopy revealed a decrease of the charge transfer resistance, which is attributed to the bacteria involvement in the process of passive layer development.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2018.05.009