Development of anodic and cathodic blisters at a model Zn/epoxy interface studied using local electrochemical impedance

Shkirskiy, Viacheslav; Krasnova, A. O.; Sanchez, Thomas; Amar, Abdelilah; Vivier, Vincent; Volovitch, P.

doi:10.1016/j.elecom.2019.106633

Cited by 5 publications

(12 citation statements)

References 31 publications

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“…Separately, local electrochemical impedance mapping (LEIM) was performed on three additional samples under AC-DC-AC tests. The electrochemical setup is described in detail in [30]. The local probe consisted of two Ag wires of 150 µm in diameter sealed in twin-capillaries using 3M glue.…”

Section: Electrochemical Characterization and Time Lapse Microscopymentioning

confidence: 99%

“…[26,27,28]. To localize the disbondment at polymer-metal interface, Local Electrochemical Impedance Mapping (LEIM) [29,30] and Scanning Vibrating Electrode (SVET) [31] can both detect the electrochemical reactivity in delaminated areas and distinguish the anodic and the cathodic reactive zones. However, contrary to LEIM, SVET cannot detect the underpaint reactivity in the absence of a defect in the paint.…”

Section: Introductionmentioning

confidence: 99%

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New experimental approach for intelligent screening of buried metal/oxide/polymer interfaces via local electrochemistry: Example of undamaged model epoxy-coated Zn alloys

Sanchez

Gillet

Shkirskiy

et al. 2021

Electrochimica Acta

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A new simple experimental approach is proposed for in situ mechanistic studies of the underpaint stability of metal/oxide/polymer interface under immersion. It allows an intelligent screening and fast ranking of conversion coatings on Zn alloys designed for further application of organic coatings. The approach is based on the application of a simple electrochemical aging protocol to the samples preliminary coated with a model epoxy-polymer. The latter is enough thin to allow local electrochemical impedance measurement and stable under this protocol, as revealed by attenuated total reflectance infrared spectroscopy (ATR-IR) and electrochemical impedance spectroscopy (EIS). The interface stability and degradation modes characterization is accessed via combined EIS, local electrochemical impedance spectroscopy and mapping (LEIS and LEIM) and in situ optical imaging.The developed approach allowed to discriminate two Zn alloy substrates, one with intact and another with slightly damaged Cr(III) conversion layer, for which no strong differences in the electrochemical behavior or average surface composition was visible prior to the epoxy-polymer application. The relative stability of two substrates with model thin coating, evaluated in the developed electrochemical test, correlated with the observations obtained for the same substrates coated with thick commercial epoxy primer after 1000 h of immersion. The proposed methodology offers the possibility of a rapid intelligent screening of various formulations of Cr(III)-based surface treatments for Zn based substrates designed for paint applications.

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Section: Electrochemical Characterization and Time Lapse Microscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New experimental approach for intelligent screening of buried metal/oxide/polymer interfaces via local electrochemistry: Example of undamaged model epoxy-coated Zn alloys

Sanchez

Gillet

Shkirskiy

et al. 2021

Electrochimica Acta

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“…For LEIM, the setup used in [40,41] The size evolution of the active zone was estimated from the evolution of the distance between the extrema of the local impedance gradient mapping [48]. The gradient maps of the local impedance were calculated and represented with an in-lab developed Python script [36].…”

Section: <Fig3> Electrochemical Impedancementioning

confidence: 99%

“…Scanning vibrating electrode techniques (SVET) measures the local currents, which can be helpful to characterize defects in coating but cannot overcome the inherent difficulty in measuring currents underneath high resistance coatings [31,32]. Local electrochemical impedance spectroscopy and mapping (LEIS and LEIM) [33,34,35,36,37,38] are becoming widespread techniques to study buried interfaces for the systems in which the polymer does not have initial defects [39,40,41]. SVET and LEIS measure both the local current density, for the former case, the DC component is measured, whereas for the later, the AC component at a selected frequency can be obtained.…”

Section: Introductionmentioning

confidence: 99%

Detection and quantification of defect evolution at buried metal-oxide-polymer interface on rough substrate by local electrochemical impedance mapping

Sanchez

Kurchavova

Shkirskiy

et al. 2021

Electrochimica Acta

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“…The influence of cell and electrode geometries, − probe position, and probe geometry , on the LEIS was clarified, allowing the direct comparison of local and global impedances. This technique was used to identify active areas and quantify the kinetics of local metal dissolution, pitting, and the degradation of polymer-modified surfaces of Zn, , Al2024, and carbon steel. , The spatial resolution of LEIS is typically restricted to the microscale owing to difficulties of scaling down the probe size, as well as controlling the tip-to-substrate distance during scanning. , …”

Section: Introductionmentioning

confidence: 99%

Electrochemical Impedance Measurements in Scanning Ion Conductance Microscopy

et al. 2020

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Electrochemical impedance spectroscopy (EIS) is a versatile tool for electrochemistry, particularly when applied locally to reveal the properties and dynamics of heterogeneous interfaces. A new method to generate local electrochemical impedance spectra is outlined, by applying a harmonic bias between a quasi-reference counter electrode (QRCE) placed in a nanopipet tip of a scanning ion conductance microscope (SICM) and a conductive (working electrode) substrate (two-electrode setup). The AC frequency can be tuned so that the magnitude of the impedance is sensitive to the tip-to-substrate distance, whereas the phase angle is broadly defined by the local capacitive response of the electrical double layer (EDL) of the working electrode. This development enables the surface topography and the local capacitance to be sensed reliably, and separately, in a single measurement. Further, self-referencing the probe impedance near the surface to that in the bulk solution allows the local capacitive response of the working electrode substrate in the overall AC signal to be determined, establishing a quantitative footing for the methodology. The spatial resolution of AC-SICM is an order of magnitude larger than the tip size (100 nm radius), for the studies herein, due to frequency dispersion. Comprehensive finite element method (FEM) modeling is undertaken to optimize the experimental conditions and minimize the experimental artifacts originating from the frequency dispersion phenomenon, and provides an avenue to explore the means by which the spatial resolution could be further improved.

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Development of anodic and cathodic blisters at a model Zn/epoxy interface studied using local electrochemical impedance

Cited by 5 publications

References 31 publications

New experimental approach for intelligent screening of buried metal/oxide/polymer interfaces via local electrochemistry: Example of undamaged model epoxy-coated Zn alloys

New experimental approach for intelligent screening of buried metal/oxide/polymer interfaces via local electrochemistry: Example of undamaged model epoxy-coated Zn alloys

Detection and quantification of defect evolution at buried metal-oxide-polymer interface on rough substrate by local electrochemical impedance mapping

Electrochemical Impedance Measurements in Scanning Ion Conductance Microscopy

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