Cathodic delamination of polyurethane films on oxide covered steel – Combined adhesion and interface electrochemical studies

Wielant, Jan; Posner, R.; Hausbrand, René; Grundmeier, Guido; Terryn, Herman

doi:10.1016/j.corsci.2009.04.014

Cited by 53 publications

(56 citation statements)

References 29 publications

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“…12 Electrochemical reactions at the metal/polymer interface play an important role on delamination kinetics. Hence, a quantitative knowledge of the reaction rate at this buried metal/coating interface is needed.…”

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confidence: 99%

Probing the Buried Metal-Organic Coating Interfacial Reaction Kinetic Mechanisms by a Hydrogen Permeation Based Potentiometric Approach

Vijayshankar

Altin

Merola

et al. 2016

J. Electrochem. Soc.

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Corrosion driven delamination of coatings is crucially determined by the rate of the cathodic oxygen reduction reaction at the buried metal-organic coating interface. Quantitative measurement of this rate at such interfaces by conventional techniques is impeded due to the blocking of ion transport by the coating. A new approach where hydrogen permeation is used as a tool to measure the oxygen reduction rate underneath coatings has been recently introduced. This permeation based potentiometry approach measures the rate of the oxygen reduction reaction by correlating the open circuit potential established as a consequence of the dynamic electrochemical equilibrium between hydrogen oxidation and oxygen reduction reactions on the coated exit side with the hydrogen uptake rate on the entry side. In this work, the interfacial reaction kinetics of the oxygen reduction reaction causing delamination of the coating are investigated by this hydrogen permeation based potentiometric approach. Moreover, thus performed prolonged cathodic polarizations of the palladium/coating interface have been found to destroy the interface, just like it is the case in the cathodic delamination process. Initial results obtained on ultra-thin films of iron on palladium are also presented, showing that the technique is applicable also on technically more relevant metal surfaces. Corrosion driven degradation of the buried metal/organic coating interface is of utmost interest in the contemporary space of coatings science. Earlier studies have shown conclusively that the oxygen reduction reaction (ORR) plays a fundamental role in the destruction of this buried metal/organic coating interface. The role of the interface between organic coating and metal has been object of intense research over last decades. Leidheiser et al.1 pointed out the key role of the cathodic ORR for the degradation process and also showed that diffusion processes such as water and oxygen transport through the coating can influence this delamination rate. Stratmann and co-workers 2-4 proposed a detailed delamination mechanism for a basic polymer coating on steel where galvanic coupling between the defect site of metal dissolution (local anode) and delamination site of electrochemical oxygen reduction (local cathode) supported by cation migration along the polymer/metal interface lead to the progressive deadhesion of the polymer from the underlying metal based on comprehensive analysis of the local electrode potential at the metal/polymer interface using primarily the Scanning Kelvin Probe (SKP) technique along with complementary Auger electron spectroscopy and mechanical deadhesion tests. Fürbeth and Stratmann 5-7 extended their studies to coated zinc (or galvanized steel), which also involves anodic processes at the interface. Also other works by Brewis et al. 8 and Dickie et al. 9 show the importance of interfacial electrochemical reactions on metal/polymer adhesion. Up to now our knowledge about the reactions and how they are determined by the interface itself is too rest...

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confidence: 99%

Probing the Buried Metal-Organic Coating Interfacial Reaction Kinetic Mechanisms by a Hydrogen Permeation Based Potentiometric Approach

Vijayshankar

Altin

Merola

et al. 2016

J. Electrochem. Soc.

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“…18,19 A critical point is the bonding between the metal and the polymer, which can significantly reduce the delamination rate. 12,20,21 An approach for further suppression of cathodic delamination is the addition of active components into the organic coating. 22,23 The most effective inhibitors are based on Cr VI .…”

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confidence: 99%

Cyclodextrins as Carriers for Organic Corrosion Inhibitors in Organic Coatings

Altin

Rohwerder

Erbe

2017

J. Electrochem. Soc.

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Coatings are widely applied on metal surfaces for protection against corrosion. Once a coating is damaged and a defect is filled by aqueous solutions, delamination of the coating initiates further materials degradation. Cathodic delamination can be suppressed by adding active additives to the coating matrix. In this study, the impact was investigated of β-cyclodextrin inhibitor complex (β-CD [Inh]) additives in polyvinylbutyral model coatings on the cathodic delamination of coatings on zinc, using the scanning Kelvin probe (SKP). With the presence of the β-CD [Inh] in the coating, a decrease was observed of the delamination rate to 1/4 of that in the reference system without β-CD [Inh]. Release experiments using UV-Vis spectroscopy showed that in the presence of cyclodextrins, the released concentration of the inhibitor 2-mercaptobenzothiazole from the coating increased. The increase was most pronounced under alkaline conditions, where the released concentration within 24 h increased by a factor of 6 compared to a reference system without β-CD. Zinc and its alloys are industrial products for cathodic corrosion protection of steel components. They are hence used in a variety of applications, e.g. in metallic coatings.1 On the other hand, zinc may corrode itself actively, which is why a protection of the metal is needed. A straightforward way to protect non-noble metals such as zinc against corrosion is the application of organic coatings. 2-4

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“…This technique has been established to detect electrode potentials at buried polymer/oxide/substrate interfaces. The results by Wielant showed a possible correlation between the polymer/ironoxide peel-off force and the polar surface energy component [82].…”

Section: Defect Detection For Coatingsmentioning

confidence: 97%

“…They stated that the influence of surrounding noises can interfere with the results of the analytical method. Another noninvasive method is shown in the work done by Fürbeth et al [24] and Wielant et al [82] -the scanning kelvin probe. This technique has been established to detect electrode potentials at buried polymer/oxide/substrate interfaces.…”

Section: Defect Detection For Coatingsmentioning

confidence: 99%