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Назаров, А. Д.; Thierry, Dominique

doi:10.1023/a:1021995208966

Cited by 22 publications

(32 citation statements)

References 12 publications

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“…− 500 mV; while at the epoxide outer surface it is as low as -950 mV. The potential difference between the outer surfaces is 450 mV; it is approximately equal to the potential drop in the metal/polymer EDL, due to the − Zn-O -+ NH x R dipole layer formation [11]. A shortterm exposure to RH of 90% equalized the potentials at the bare and polymer-coated metal surfaces (Fig.…”

Section: Skp-study Of Zinc-epoxide Contactsmentioning

confidence: 82%

“…The coatings were: a Bison Kombi Rapid epoxide [the Bisphenol A resin and N(3-dimethylaminopropyl)-1,3propylenediamin hardener], a Beckers Syntem spray alkyd polymer, and a Corrpassive 4900 polyaniline [11]. Prior to applying the coating, the metal surfaces were degreased with ethanol, rinsed with deionized water, and dried in air.…”

Section: Methodsmentioning

confidence: 99%

“…The nature of Volta potential and the principle of the Scanning Kelvin Probe (SKP) operation (UBM Messtechnik) were described earlier [10][11][12]. In the first scan, a geometrical surface profile was obtained, which allowed determining the coating thickness.…”

Section: Methodsmentioning

confidence: 99%

“…During interfacial interaction, protons transfer from acid groups (the hydroxylated metal surface or the polymer's acid groups) to basic centers (the polymer's basic groups or oxidehydroxide metal groups). The EDL structure for different metal/polymer contacts can be studied with the use of a scanning Kelvin probe ( SKP ) [9][10][11][12]. The potential drop in a metal/polymer EDL comes to 300-600 mV.…”

Section: Introductionmentioning

confidence: 99%

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Hydrolysis of interfacial bonds in a metal/polymer electrical double layer

Назаров¹,

Thierry²

2005

Prot Met

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Effect of water on the electrical double layer structure at a metal/polymer interface is studied with the use of scanning vibrating capacitor and electrochemical impedance spectroscopy. In the initial stage, the Volta potential of the contact changes well reversibly and rapidly, being proportional to the water vapor pressure, following its diffusion in the polymer ( ∆ V = A + B log (time) 1/2 ). Water dipoles at the metal/polymer interface orientate counter the field and compensate it. Drying of the contact restores the initial potential drop. In the first stage of exposure, water somewhat enhances the interfacial interaction, which manifests itself in increasing the potential drop, as well as the charge transfer resistance, and in decreasing the capacitance of the electrical double layer. As time passes, the interface hydrolyzes, its capacitance grows and the time of subsequently restoring the electrical double layer by drying increases. Kinetic dependences of the potential and capacitance, exhibit two segments, we ascribe to easily removable and strongly bonded water molecules solvating the interface, respectively. It is shown that metal-polymer interfacial bonds passivate the metal; however, the passivation can be broken down because of the hydrolysis and the interfacial moisture film formation.

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Section: Skp-study Of Zinc-epoxide Contactsmentioning

confidence: 82%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrolysis of interfacial bonds in a metal/polymer electrical double layer

Назаров¹,

Thierry²

2005

Prot Met

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“…The measured potentials under the adhesive layer are constantly shifted to lower values by about 200 mV, which can be observed for all measurements under an epoxy layer in this article. This constant shift of metal oxide potentials underneath epoxy adhesives was interpreted by Nazarov et al [17] as a kind of electrical double layer (EDL) due to orientated ionic dipoles of the amine/iron oxide interaction at the interface. Anyhow, this shift does not influence the interpretation of potential profiles since it is constant for the results discussed here.…”

Section: Proof Of the Cathodic Delamination Mechanismmentioning

confidence: 83%

Application of the Scanning Kelvin Probe for the study of the corrosion resistance of interfacial thin organosilane films at adhesive/metal interfaces

Wapner

Grundmeier

2005

Silicon Chem

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The Scanning Kelvin Probe is introduced as a real time non-destructive in situ technique for the detection of de-adhesion at adhesive/metal oxide interfaces. Iron substrates and an epoxy adhesive served as model systems. Iron surfaces were coated with ultra-thin organosilane plasma polymer films from a microwave discharge and 3-(trimethoxysilyl)-propylamine films from dilute water based solutions. Surface and film characterisation was done by means of atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and infrared reflection absorption spectroscopy (IRRAS). The effect of these interfacial films on the stability of the adhesive/metal joint was studied in corrosive environments. The Scanning Kelvin Probe allows the measurement of electrode potentials at buried polymer/metal interfaces with a spatial resolution of about 100 µm. The electrode potential characterises the reactivity of the interface. Moreover, by the variation of the oxygen partial pressure in the measurement chamber, local anodes and cathodes underneath the polymer can be distinguished. The kinetics of electrochemical de-adhesion can be effectively slowed down by thin 3-(trimethoxysilyl)-propylamine films at the interface. The effect of the adhesion promoter can be further improved when a thin SiO x layer, which inhibits electron transfer reactions, and is deposited on the iron surface prior to coating with the adhesion promoter.

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An SKP and EIS investigation of amine adsorption on zinc oxide surfaces

Назаров

Thierry

Volovitch

et al. 2010

Surface & Interface Analysis

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A metal/oxide/polymer 'interphase' with mixed organic-inorganic nature insures the high stability and the strength of the adhesive joints in a variety of corrosive environments. To model the interaction of epoxy resin with a metal surface, the interaction of amines of different structure with oxidized zinc surfaces was studied by Scanning Kelvin Probe (SKP), FTIR microscopy in atmospheric conditions, and a.c. and d.c. electrochemical techniques in the aqueous electrolyte. It was shown that bidentate ligand-ethylendiamine, forming stable chelate complexes reacts with zinc oxide with redeposition of the interphase. In air and water electrolyte, this ligand shifts the potential of Zn/ZnO electrode to the level of the oxide-free zinc. The amines with low chelating property show low effect on the potential of Zn/ZnO. The SKP was used to measure the potential drop at epoxy resin/zinc interface. On this basis, SKP is proposed as a sensitive nondestructive technique to characterize in situ the interaction of the resin with the metal and the subsequent formation of the interphase in the metal-polymer joints. Copyright

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Cited by 22 publications

References 12 publications

Hydrolysis of interfacial bonds in a metal/polymer electrical double layer

Hydrolysis of interfacial bonds in a metal/polymer electrical double layer

Application of the Scanning Kelvin Probe for the study of the corrosion resistance of interfacial thin organosilane films at adhesive/metal interfaces

An SKP and EIS investigation of amine adsorption on zinc oxide surfaces

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