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Kanauem J.N.,Laboratoire des Materiaux et Molecules en Milieu Amazonien | Robert F.,Laboratoire des Materiaux et Molecules en Milieu Amazonien | Roos C.,Laboratoire des Materiaux et Molecules en Milieu Amazonien
European Corrosion Congress 2011, EUROCORR 2011 | Year: 2011

Corrosion induced by the microorganisms is a phenomenon still poorly known and difficult to interpret. In this work we are interested in marine corrosion of stainless steel 254 SMO by Amazonians biofilms. The objective is to achieve an experimental laboratory to reproduce the corrosion completely controlled environment. The microbiologically influenced corrosion (MIC) of stainless steel by marine bacteria was investigated using surface analysis (scanning electron microscopy (SEM)), and electrochemical techniques (the open circuit potential, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization curves). The epifluorescence microscopy has been used to correlate the experiments. We investigated the role of some chemical parameters and the influence of the tide. Source


Rivalland C.,Laboratoire des Materiaux et Molecules en Milieu Amazonien | Madhkour S.,Laboratoire des Materiaux et Molecules en Milieu Amazonien | Salvin P.,Laboratoire des Materiaux et Molecules en Milieu Amazonien | Robert F.,Laboratoire des Materiaux et Molecules en Milieu Amazonien
Bioelectrochemistry | Year: 2015

Electroactive biofilms were formed from French Guiana mangrove sediments for the analysis of bacterial communities' composition. The electrochemical monitoring of three biofilm generations revealed that the bacterial selection occurring at the anode, supposedly leading microbial electrochemical systems (MESs) to be more efficient, was not the only parameter to be taken into account so as to get the best electrical performance (maximum current density). Indeed, first biofilm generations produced a stable current density reaching about 18A/m2 while second and third generations produced current densities of about 10A/m2. MES bacterial consortia were characterized thanks to molecular biology techniques: DGGE and MiSeq® sequencing (Illumina®). High-throughput sequencing data statistical analysis confirmed preliminary DGGE data analysis, showing strong similarities between electroactive biofilms of second and third generations, but also revealing both selection and stabilization of the biofilms. © 2015 Elsevier B.V. Source


Lecante A.,Laboratoire des Materiaux et Molecules en Milieu Amazonien | Robert F.,Laboratoire des Materiaux et Molecules en Milieu Amazonien | Blandinires P.A.,Laboratoire des Materiaux et Molecules en Milieu Amazonien | Roos C.,Laboratoire des Materiaux et Molecules en Milieu Amazonien
Current Applied Physics | Year: 2011

The effect of alkaloid extracts from two Amazonian trees (Guatteria ouregou and Simira tinctoria) on low carbon steel corrosion was investigated in acidic solutions by using electrochemical techniques. All of these plant extracts inhibit the corrosion of low carbon steel in 0.1 M HCl solutions. As their concentration increases to 250 mg/L, the inhibition efficiencies of S. tinctoria and G. ouregou alkaloid extracts reach approximately 92% in 0.1 M HCl solutions. The adsorption of the inhibitor molecules was in accordance with the Langmuir adsorption isotherm. The results obtained show that these plant extracts could be serve as an effective inhibitor for the corrosion of low carbon steel in hydrochloric acid media. Furthermore, harmane was identified as the main component of S. tinctoria extract and that suggests that it is the active ingredient against corrosion of low carbon steel. © 2010 Elsevier B.V. All rights reserved. Source

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