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.

Effect of Pseudomonas fluorescens on the electrochemical behaviour of a single-phase Cu-Sn modern bronze / G. Ghiara, R. Spotorno, S.P. Trasatti, P. Cristiani. - In: CORROSION SCIENCE. - ISSN 0010-938X. - 139(2018 Jul 15), pp. 227-234.

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

S.P. Trasatti;
2018-07-15

Abstract

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.
Copper tin alloy; EIS; Polarization; Raman spectroscopy; SEM; Microbiological corrosion; Passive films
Settore ING-IND/23 - Chimica Fisica Applicata
Settore ING-IND/22 - Scienza e Tecnologia dei Materiali
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/623987
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