Scanning Kelvin Probe

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Dirk Engelberg - One of the best experts on this subject based on the ideXlab platform.

Cem Ornek - One of the best experts on this subject based on the ideXlab platform.

Dominique Thierry - One of the best experts on this subject based on the ideXlab platform.

  • hydrogen effect on the passivation and crevice corrosion initiation of aisi 304l using Scanning Kelvin Probe
    Corrosion Science, 2021
    Co-Authors: Shubina V Helbert, Andrej Nazarov, F Vucko, S Rioual, Dominique Thierry
    Abstract:

    Abstract Scanning Kelvin Probe was applied to study passivation of AISI 304 L stainless steel after cathodic polarisation. The rate of passivation in air decreased as a function of duration and current density. X-ray Photoelectron Spectroscopy showed enrichment of the surface film by hydroxides of Fe (II) that was the result of hydrogen effusion from the bulk. SKP measured a decreased potential drop in the passive film. Pre-polarisation accelerates the crevice corrosion of steel in presence of chlorides. Using SKP mapping, increased hydrogen sub-surface concentration and lower level of passivity was observed in anodic zones of the crevice.

  • Application of Scanning Kelvin Probe in the study of protective paints.
    Frontiers in Materials, 2019
    Co-Authors: Andrej Nazarov, Dominique Thierry
    Abstract:

    Industrial coatings are composed of layers of different polymers (top coats, primers) containing pigments, corrosion inhibitors, and fillers as well as additives. For corrosion protection, it is vitally important to preserve the strong adhesion and long-term stability of the metal-polymer interface in corrosive environments. In recent decades, the performance of painted materials increased, which requires the application of advanced methods for quick assessing, ranking and predicting corrosion stability. Scanning Kelvin Probe (SKP) is a highly sensitive and non-invasive technique to analyze in situ the metal-polymer interface of high-performance industrial coatings. SKP is able to monitor the adhesion and corrosion underneath different kinds of paints without the need for long-term corrosion tests. SKP is a localized electrochemical technique with a spatial resolution in the range of 70-100 µm. Hence, it is possible to obtain information about the intact and corroding portions of the interface at defect sites, corrosion blisters, contaminants and intermetallics, quality of pretreatments, and the development of galvanic couples that lead to corrosion de-adhesion of the polymeric coatings. This article reviews the application of SKP to the determination of the mechanisms of corrosion de-adhesion of model paints, thick marine paints, coatings with zinc rich primers, automotive paints and coil coatings applied on galvanized steel substrates.

  • Assessment of steel corrosion and deadhesion of epoxy barrier paint by Scanning Kelvin Probe
    Progress in Organic Coatings, 2018
    Co-Authors: Andrej Nazarov, Nathalie Le Bozec, Dominique Thierry
    Abstract:

    Abstract Marine paints are complex polymeric systems containing layers of different nature that significantly delay the corrosion failures. In order to obtain a rapid ranking in the corrosion protection provided by the paints, it is important to apply sensitive and non-invasive methods for early detection of under paint corrosion. Scanning Kelvin Probe (SKP) was used to determine the mechanism(s) of corrosion and paint de-adhesion. This technique is sensitive to the metal-polymer interface and gives a quick assessment of cathodic delamination or anodic undermining. Depending on the type of exposure the mode of corrosion de-adhesion was evaluated and compared with SKP data obtained under polarization experiments by impressed current in aqueous electrolyte. After exposure, pull off test and Scanning Electron Microscopy – Energy Dispersive X ray Spectrometry (SEM-EDX technique) were applied to determine the paint adhesion stability around the defect and to analyse the steel-paint interface.

  • Effect of Mechanical Stress on the Properties of Steel Surfaces: Scanning Kelvin Probe and Local Electrochemical Impedance Study
    Journal of The Electrochemical Society, 2017
    Co-Authors: Andrej Nazarov, Dominique Thierry, Vincent Vivier, Flavien Vucko, Bernard Tribollet
    Abstract:

    The influence of mechanical stress on the electrochemical properties of ferritic steel SAE 1008 and austenitic stainless steel 301LN was studied using Scanning Kelvin Probe and Localized Electroche ...

  • Assessment of corrosion de-adhesion of thick marine paints applied on steel using Scanning Kelvin Probe technique
    2017
    Co-Authors: Nathalie Lebozec, Andrej Nazarov, Dominique Thierry
    Abstract:

    Assessment of corrosion de-adhesion of thick marine paints applied on steel using Scanning Kelvin Probe technique

Andrej Nazarov - One of the best experts on this subject based on the ideXlab platform.

  • hydrogen effect on the passivation and crevice corrosion initiation of aisi 304l using Scanning Kelvin Probe
    Corrosion Science, 2021
    Co-Authors: Shubina V Helbert, Andrej Nazarov, F Vucko, S Rioual, Dominique Thierry
    Abstract:

    Abstract Scanning Kelvin Probe was applied to study passivation of AISI 304 L stainless steel after cathodic polarisation. The rate of passivation in air decreased as a function of duration and current density. X-ray Photoelectron Spectroscopy showed enrichment of the surface film by hydroxides of Fe (II) that was the result of hydrogen effusion from the bulk. SKP measured a decreased potential drop in the passive film. Pre-polarisation accelerates the crevice corrosion of steel in presence of chlorides. Using SKP mapping, increased hydrogen sub-surface concentration and lower level of passivity was observed in anodic zones of the crevice.

  • Application of Scanning Kelvin Probe in the study of protective paints.
    Frontiers in Materials, 2019
    Co-Authors: Andrej Nazarov, Dominique Thierry
    Abstract:

    Industrial coatings are composed of layers of different polymers (top coats, primers) containing pigments, corrosion inhibitors, and fillers as well as additives. For corrosion protection, it is vitally important to preserve the strong adhesion and long-term stability of the metal-polymer interface in corrosive environments. In recent decades, the performance of painted materials increased, which requires the application of advanced methods for quick assessing, ranking and predicting corrosion stability. Scanning Kelvin Probe (SKP) is a highly sensitive and non-invasive technique to analyze in situ the metal-polymer interface of high-performance industrial coatings. SKP is able to monitor the adhesion and corrosion underneath different kinds of paints without the need for long-term corrosion tests. SKP is a localized electrochemical technique with a spatial resolution in the range of 70-100 µm. Hence, it is possible to obtain information about the intact and corroding portions of the interface at defect sites, corrosion blisters, contaminants and intermetallics, quality of pretreatments, and the development of galvanic couples that lead to corrosion de-adhesion of the polymeric coatings. This article reviews the application of SKP to the determination of the mechanisms of corrosion de-adhesion of model paints, thick marine paints, coatings with zinc rich primers, automotive paints and coil coatings applied on galvanized steel substrates.

  • Assessment of steel corrosion and deadhesion of epoxy barrier paint by Scanning Kelvin Probe
    Progress in Organic Coatings, 2018
    Co-Authors: Andrej Nazarov, Nathalie Le Bozec, Dominique Thierry
    Abstract:

    Abstract Marine paints are complex polymeric systems containing layers of different nature that significantly delay the corrosion failures. In order to obtain a rapid ranking in the corrosion protection provided by the paints, it is important to apply sensitive and non-invasive methods for early detection of under paint corrosion. Scanning Kelvin Probe (SKP) was used to determine the mechanism(s) of corrosion and paint de-adhesion. This technique is sensitive to the metal-polymer interface and gives a quick assessment of cathodic delamination or anodic undermining. Depending on the type of exposure the mode of corrosion de-adhesion was evaluated and compared with SKP data obtained under polarization experiments by impressed current in aqueous electrolyte. After exposure, pull off test and Scanning Electron Microscopy – Energy Dispersive X ray Spectrometry (SEM-EDX technique) were applied to determine the paint adhesion stability around the defect and to analyse the steel-paint interface.

  • Effect of Mechanical Stress on the Properties of Steel Surfaces: Scanning Kelvin Probe and Local Electrochemical Impedance Study
    Journal of The Electrochemical Society, 2017
    Co-Authors: Andrej Nazarov, Dominique Thierry, Vincent Vivier, Flavien Vucko, Bernard Tribollet
    Abstract:

    The influence of mechanical stress on the electrochemical properties of ferritic steel SAE 1008 and austenitic stainless steel 301LN was studied using Scanning Kelvin Probe and Localized Electroche ...

  • Assessment of corrosion de-adhesion of thick marine paints applied on steel using Scanning Kelvin Probe technique
    2017
    Co-Authors: Nathalie Lebozec, Andrej Nazarov, Dominique Thierry
    Abstract:

    Assessment of corrosion de-adhesion of thick marine paints applied on steel using Scanning Kelvin Probe technique

D. Thierry - One of the best experts on this subject based on the ideXlab platform.

  • Localized Corrosion of Heat-Treated and Welded Stainless Steel Studied Using a Scanning Kelvin Probe
    CORROSION, 2005
    Co-Authors: G. Bäck, A. Nazarov, D. Thierry
    Abstract:

    Abstract The Scanning Kelvin Probe has been applied for the nondestructive analyses of stainless steel surfaces. The influence of oxide thickness, oxide composition, and microstructure on the Volta potential has been studied. The study was performed by subjecting stainless steel of grades AISI 304 (UNS S30400) and AISI 316 (UNS S31600) to various heat treatments and surface treatments and measuring the resulting changes in Volta potential. Both the thickness and the composition of the surface oxide clearly affected the Volta potential of the stainless steel. No significant influence on the Volta potential from the precipitation of chromium carbides and the surface depletion of chromium was observed.

  • Scanning Kelvin Probe study of metal polymer interfaces
    Electrochimica Acta, 2004
    Co-Authors: A.p. Nazarov, D. Thierry
    Abstract:

    Abstract A Scanning Kelvin Probe was used to study the metal/polymer contacts for models of epoxy, alkyd and polyaniline coatings. It was shown that the potential drop across the electrical double layer of oriented ionic dipoles at the metal/polymer interface contributes a major part of the measured Volta potentials. The Bronsted acid/base interactions are responsible for the charge separation and the creation of a double electric layer. Polyaniline (an electron-conducting polymer) accepts electrons from the metal to its own Fermi level, thus producing a Schottky barrier. In this case, the Volta potential of the contact does not depend on the metal, but follows the polyaniline flat band potential. Exposure in water vapor neutralizes the potential drop at the interface due to water dipole orientation in a direction opposite to the intrinsic electric field. The kinetics of potential change during water uptake follow Fick’s and Nernst’s equations. After hydrolysis of the interfacial bonds, activation of the metal surface can takes place.

  • Scanning Kelvin Probe study of metal/polymer interfaces
    Electrochimica Acta, 2004
    Co-Authors: A.p. Nazarov, D. Thierry
    Abstract:

    Abstract A Scanning Kelvin Probe was used to study the metal/polymer contacts for models of epoxy, alkyd and polyaniline coatings. It was shown that the potential drop across the electrical double layer of oriented ionic dipoles at the metal/polymer interface contributes a major part of the measured Volta potentials. The Bronsted acid/base interactions are responsible for the charge separation and the creation of a double electric layer. Polyaniline (an electron-conducting polymer) accepts electrons from the metal to its own Fermi level, thus producing a Schottky barrier. In this case, the Volta potential of the contact does not depend on the metal, but follows the polyaniline flat band potential. Exposure in water vapor neutralizes the potential drop at the interface due to water dipole orientation in a direction opposite to the intrinsic electric field. The kinetics of potential change during water uptake follow Fick’s and Nernst’s equations. After hydrolysis of the interfacial bonds, activation of the metal surface can takes place.

  • Analysis of Surface Carbon Contamination on Phosphated Zinc Surfaces by Scanning Kelvin Probe Measurements
    Journal of The Electrochemical Society, 1998
    Co-Authors: A. Nazarov, D. Thierry
    Abstract:

    The Scanning Kelvin Probe has been used to detect the presence of carbon particles on phosphated and electrogalvanized steel panels. The results showed that 30-40 μm carbon particles could be detected by this method. Oxygen reduction is shown to be the rate-limiting step for the atmospheric corrosion of phosphated zinc surfaces. The presence of carbon particles leads to a rapid degradation of the phosphate layer at the contaminated locations.

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