Search results for: S. Joiret

Items from 1 to 20 out of 37 results

article

Corrosion protection of bronze using 2,5-dimercapto-1,3,4-thiadiazole as organic inhibitor: spectroscopic and electrochemical investigations

W. Qafsaoui, A. Et Taouil, M. W. Kendig, O. Heintz, more

Journal of Applied Electrochemistry > 2019 > 49 > 8 > 823-837

Effect of 2,5-dimercapto-1,3,4-thiadiazole (DMTD) concentration on the electrochemical behaviour of bronze was studied in 30 g L⁻¹ sodium chloride (NaCl) by means of surface analyses and electrochemical techniques. Scanning electron microscopy (SEM) was used to observe surface morphology. Raman micro-spectroscopy was carried out to study chemical structure of deposited layers. X-ray photoelectron...

article

Coupling of electrochemical, electrogravimetric and surface analysis techniques to study dithiocarbamate/bronze interactions in chloride media

W. Qafsaoui, A. Et Taouil, M.W. Kendig, H. Cachet, more

Corrosion Science > 2018 > 130 > C > 190-202

Interaction between ammonium pyrrolidinedithiocarbamate (PDTC) and bronze in 30gL⁻¹ NaCl was investigated at several concentrations between 0.1 and 10mM by means of various electrochemical and spectroscopic techniques. Electrochemical measurements revealed a fast adsorption process of PDTC on Cu and Pb and the formation of a thick insulating and protective film with a high surface coverage. At high...

article

Ammonium pyrrolidine dithiocarbamate adsorption on copper surface in neutral chloride media

W. Qafsaoui, M.W. Kendig, S. Joiret, H. Perrot, more

Corrosion Science > 2016 > 106 > C > 96-107

Adsorption of ammonium pyrrolidine dithiocarbamate (PDTC) on copper surface in 0.2 and 30gL⁻¹ NaCl media was investigated by different electrochemical methods and surface analyses. The results from electrochemical measurements showed that PDTC adsorbs rapidly on copper surface and revealed a marked effect of mixed inhibition. Surface analyses confirm the adsorption of PDTC on copper and the formation...

article

Identification of a new pseudo-binary hydroxide during calendar corrosion of (La, Mg)2Ni7-type hydrogen storage alloys for Nickel–Metal Hydride batteries

J. Monnier, H. Chen, S. Joiret, J. Bourgon, more

Journal of Power Sources > 2014 > 266 > Complete > 162-169

To improve the performances of Nickel–Metal Hydride batteries, an important step is the understanding of the corrosion processes that take place in the electrode material. In particular, the present study focuses for the first time on the model (La, Mg) ₂ Ni ₇ system. The calendar corrosion in 8.7 M KOH medium was investigated from 6 h to 16 weeks immersion. By a unique combination...

article

Initiation and growth of a single pit on 316L stainless steel: Influence of SO42− and ClO4− anions

N. Aouina, F. Balbaud-Célérier, F. Huet, S. Joiret, more

Electrochimica Acta > 2013 > 104 > Complete > 274-281

In this paper, an ion micro dispenser (IMD) was used to initiate a single pit by generating chloride anions above a 316L stainless steel electrode in either H ₂ SO ₄ or HClO ₄ electrolyte. The current variations with respect to time provided an unambiguous characterization of the single pit evolution. Different pit shapes were observed depending on both the nature of the electrolyte...

article

A flow microdevice for studying the initiation and propagation of a single pit

N. Aouina, F. Balbaud-Célérier, F. Huet, S. Joiret, more

Corrosion Science > 2012 > 62 > Complete > 1-4

A novel experimental setup in which a glass microcapillary can be precisely positioned close to a metallic electrode has been developed to locally inject aggressive solutions at will. It has been used for studying the pitting corrosion of a 316L stainless steel in 0.5M H ₂ SO ₄ medium. The amount of chloride ions released by the capillary could be controlled and the analysis of the...

article

Local electrochemical investigation of copper patina

M. M. Mennucci, M. Sanchez-Moreno, I. V. Aoki, M-C. Bernard, more

Journal of Solid State Electrochemistry > 2012 > 16 > 1 > 109-116

The patination of copper is known for its complexity and heterogeneous formation. For a deeper investigation, a locally resolved surface analysis was considered. An exact determination of the accessed area and a potentiostatic control in a three-electrode configuration was reached with the use of the electrochemical microcell technique, which enables local electrochemical measurement such as local...

article

Corrosion inhibition of copper in neutral chloride media by a novel derivative of 1,2,4-triazole

Z. Khiati, A.A. Othman, M. Sanchez-Moreno, M.-C. Bernard, more

Corrosion Science > 2011 > 53 > 10 > 3092-3099

The efficiency of a new corrosion inhibitor, the bis-(4-amino-5-mercapto-1,2,4-triazol-3-yl)-butane (BAMTB), on copper was investigated in an aerated 3% NaCl solution using various techniques. Voltammetry, chronopotentiometry and electrochemical impedance spectroscopy (EIS) were performed to evaluate the inhibition efficiency of BAMTB. The surface layers were also characterized by Raman micro-spectroscopy...

article

Single pit initiation on 316L austenitic stainless steel using scanning electrochemical microscopy

N. Aouina, F. Balbaud-Célérier, F. Huet, S. Joiret, more

Electrochimica Acta > 2011 > 56 > 24 > 8589-8596

Scanning electrochemical microscopy was used to locally release a controlled amount of chloride ions close to a 316L austenitic stainless steel (SS) substrate in sulphuric acid medium to generate a single pit. Then, usual electrochemical techniques were applied for studying the early stages of pit initiation and propagation. The amount of chloride ions needed to reach the requisite threshold concentration...

article

Kinetic reactions in thin polyaniline films revisited through Raman–impedance dynamic coupling

X. Wang, M.C. Bernard, C. Deslouis, S. Joiret, more

Electrochimica Acta > 2011 > 56 > 10 > 3485-3493

Recently introduced as a new technique in electrochemistry, the Raman–impedance dynamic coupling allows one characterizing transfer functions so far not accessible to experiment such as instantaneous concentrations of adsorbed species in response to potential modulations. These were assessed from the measurement of the time-dependent Raman band intensities of different moieties of reduced and oxidized...

article

High frequency mass transfer responses with polyaniline modified electrodes by using new ac-electrogravimetry device

R. Torres, Y. Jimenez, A. Arnau, C. Gabrielli, more

Electrochimica Acta > 2010 > 55 > 21 > 6308-6312

For many years, polyaniline films have appeared to be one of the most studied conducting polymers. At the same time, ac-electrogravimetry has been used as a powerful technique for different polymer films but in general for slow perturbation rates. Two reasons for that: on the one hand, high frequency mass transfer responses are not expected and on the other hand, the electronic interfaces dedicated...

article

A new transfer function in electrochemistry: Dynamic coupling between Raman spectroscopy and electrochemical impedance spectroscopy

X. Wang, M.C. Bernard, C. Deslouis, S. Joiret, more

Electrochimica Acta > 2010 > 55 > 21 > 6299-6307

A new type of transfer function is described in this work as a tool to give support to modeling in electrochemical kinetics. It is based on the response analysis with frequency to a sine wave potential modulation applied to an electrode, of a Raman band, the intensity of which is proportional to the response of surface concentration of an adsorbed species.A set-up, consisting of a Raman spectrometer...

article

Corrosion inhibitive action of cysteine on Cu–30Ni alloy in aerated 0.5M H2SO4

H. Saifi, M.C. Bernard, S. Joiret, K. Rahmouni, more

Materials Chemistry and Physics > 2010 > 120 > 2-3 > 661-669

Corrosion inhibition of Cu–30Ni alloy in aerated 0.5M H ₂ SO ₄ solution by cysteine, an amino acid, has been investigated. Potentiodynamic polarization and impedance spectroscopy (EIS) at open circuit potential were performed. Corrosion current density was also determined from colorimetric experiments. Voltammetric curves showed that cysteine addition to 0.5M H ₂ SO ₄ ...

article

Understanding corrosion of ancient metals for the conservation of cultural heritage

M.C. Bernard, S. Joiret

Electrochimica Acta > 2009 > 54 > 22 > 5199-5205

Corrosion studies on ancient metallic objects are performed with the aim of evaluating their stability for a very long term. They have crossed centuries and should be transmitted in good shape to future generations. They are generally protected from aggressive conditions by a layer formed by corrosion products and this layer stability has to be checked. This work intends to show that coupling an in...

article

Nucleation-growth process of scale electrodeposition – influence of the magnesium ions

O. Devos, S. Jakab, C. Gabrielli, S. Joiret, more

Journal of Crystal Growth > 2009 > 311 > 18 > 4334-4342

Electrodeposition of CaCO ₃ was studied under the influence of magnesium ions present in a carbonically pure water. The investigation was performed using electrochemical, gravimetric and optical methods. The chronoamperometric measurements confirmed the inhibiting property of Mg ²⁺ when its concentration is higher than 120mgL ⁻¹ in a solution containing 160mgL ⁻¹ of...

article

Role of sulphate ions on the formation of calcareous deposits on steel in artificial seawater; the formation of Green Rust compounds during cathodic protection

Ch. Barchiche, C. Deslouis, O. Gil, S. Joiret, more

Electrochimica Acta > 2009 > 54 > 13 > 3580-3588

Cathodic protection of steel in seawater could be optimized by taking into account the calcareous deposits forming on the steel surface. The aim of this work was to study the influence of sulphate ions on the kinetics and mechanisms of formation of these deposits. The experiments were performed at 20°C, with an applied potential of −1.0V/saturated calomel electrode (SCE), in artificial seawater-like...

article

An electrochemical impedance spectroscopy investigation

C. Gabrielli, S. Joiret, M. Keddam, N. Portail, more

Electrochimica Acta > 2008 > 53 > 25 > 7539-7548

The analysis of a single pit behavior on iron in various media (sulfuric acid, borate buffer, and potassium hydroxide solutions) is reported. The use of SECM technique to generate a single pit has allowed usual electrochemical techniques to be applied. Electrochemical impedance spectroscopy was used to characterize the pit propagation. In acidic solution, the pit returned to its passive state quickly...

article

Investigations on the corrosion of copper patterns in the course of the “post-CMP cleaning” of integrated electronic microcircuits in oxalic acid aqueous solutions

M.C. Bernard, C. Gabrielli, S. Joiret, C. Mace, more

Electrochimica Acta > 2007 > 53 > 3 > 1325-1335

An unknown corrosion process producing dendrites was recently found to take place at copper patterns immersed in oxalic acid aqueous solutions in the course of the post-chemical–mechanical polishing of integrated microcircuits (ICs). We report here investigations of this corrosion phenomenon in ICs using atomic force microscopy (AFM), cyclic voltammetry and Raman spectroscopy. AFM first allowed an...

article

Composition and electrochemical properties of natural patinas of outdoor bronze monuments

C. Chiavari, K. Rahmouni, H. Takenouti, S. Joiret, more

Electrochimica Acta > 2007 > 52 > 27 > 7760-7769

The present study concerns the chemical–physical and electrochemical characterizations of the corrosion compounds formed on outdoor bronzes exposed in urban conditions. Here, we focused on the pale green patinas of surfaces directly exposed to the rainfall leaching. The investigation has been performed from scraped-off patina products of a well representative outdoor bronze monument (Monument to Francis...

article

A SECM assisted EQCM study of iron pitting

C. Gabrielli, S. Joiret, M. Keddam, H. Perrot, more

Electrochimica Acta > 2007 > 52 > 27 > 7706-7714

The local breakdown of the iron passive layer and the resulting pitting corrosion of iron were studied for massive material and for a thin film on an electrochemical quartz crystal microbalance (EQCM). The initiation and the propagation of a single pit on iron were controlled through the local production of chloride anion thanks to the silver chloride reduction at the tip of the scanning electrochemical...

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Search results for: S. Joiret

Corrosion protection of bronze using 2,5-dimercapto-1,3,4-thiadiazole as organic inhibitor: spectroscopic and electrochemical investigations

Coupling of electrochemical, electrogravimetric and surface analysis techniques to study dithiocarbamate/bronze interactions in chloride media

Ammonium pyrrolidine dithiocarbamate adsorption on copper surface in neutral chloride media

Identification of a new pseudo-binary hydroxide during calendar corrosion of (La, Mg)2Ni7-type hydrogen storage alloys for Nickel–Metal Hydride batteries

Initiation and growth of a single pit on 316L stainless steel: Influence of SO42− and ClO4− anions

A flow microdevice for studying the initiation and propagation of a single pit

Local electrochemical investigation of copper patina

Corrosion inhibition of copper in neutral chloride media by a novel derivative of 1,2,4-triazole

Single pit initiation on 316L austenitic stainless steel using scanning electrochemical microscopy

Kinetic reactions in thin polyaniline films revisited through Raman–impedance dynamic coupling

High frequency mass transfer responses with polyaniline modified electrodes by using new ac-electrogravimetry device

A new transfer function in electrochemistry: Dynamic coupling between Raman spectroscopy and electrochemical impedance spectroscopy

Corrosion inhibitive action of cysteine on Cu–30Ni alloy in aerated 0.5M H2SO4

Understanding corrosion of ancient metals for the conservation of cultural heritage

Nucleation-growth process of scale electrodeposition – influence of the magnesium ions

Role of sulphate ions on the formation of calcareous deposits on steel in artificial seawater; the formation of Green Rust compounds during cathodic protection

An electrochemical impedance spectroscopy investigation

Investigations on the corrosion of copper patterns in the course of the “post-CMP cleaning” of integrated electronic microcircuits in oxalic acid aqueous solutions

Composition and electrochemical properties of natural patinas of outdoor bronze monuments

A SECM assisted EQCM study of iron pitting

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