Study of the coating/substrate interface by scanning acoustic microscopy Cathodic disbonding of epoxy-polyamide lacquer from mild steel

Crossen, J. D.; Sykes, J.M.; Zhai, Tianhua; Briggs, G. A. D.

doi:10.1039/a704693f

Cited by 25 publications

(7 citation statements)

References 6 publications

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“…The finding of a constant migration velocity seems to be in contradiction to other experiments, that use destructive measuring methods, which have found that diffusion of ions (following a square-root dependence) is the rate-determining process for disbonding [5,7,8]. However, it has to be mentioned, that in most of those experiments the extent of the "cathodic delamination" was determined by visual inspection [3,8], whereas the ultrasonic microscope detects changes in the acoustic properties caused by the penetrating fluids.…”

Section: Fig 7: Measured Expansion Of the Migration Fronts For Samplcontrasting

confidence: 48%

“…This is represented by an induction time in equation 4. Induction times before cathodic blistering have been found before [7]. The data in Fig.…”

Section: Blister Growth Kineticsmentioning

confidence: 73%

“…Samples featuring a layer of primer (P/BC/CC/D1 and P/BC/CC/D2) did not show any blisters at any time before the complete delamination of the coatings from the substrate, which can be attributed to an enhanced adhesion of the primer. In most experiments by other researchers samples without primer were used [5,7,9,11,39], impeding a direct comparison of results.…”

Section: Fig 4a-b: A) Topographic Profile (Cross Section) Of Sample mentioning

confidence: 99%

“…Also, most research is concerned with epoxy-coating systems. For example, Crossen et al [7] found for an epoxypolyamide coating that the widening of the delamination zone follows parabolic kinetics, which indicates a diffusion controlled process. Sorenson et al [8] reported on the influence of substrate topography on cathodic disbonding of anticorrosive coatings.…”

Section: Introductionmentioning

confidence: 99%

“…Despite its advantages the application of SAM in coating research is still rare [9, 13, 29 -34]: For example, Briggs and Addison et al [32,35] applied SAM for in-situ monitoring of cathodic disbonding and Crossen et al [7] examined changes at the interface during cathodic disbonding of an epoxy-polyamide coating exposed to a NaCl solution. More recently, we applied SAM to investigate solvent-and water-borne 2K polyurethane systems and UV-cured acrylic systems after simulated weathering.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Investigation of delamination mechanisms in polymer coatings by scanning acoustic microscopy

Alig¹,

Bargmann²,

Oehler³

et al. 2010

J. Phys. D: Appl. Phys.

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Scanning acoustic microscopy (SAM) was used to investigate disbonding, delamination and blister formation in polymer coatings for different layer structures and initial defect depths during exposure to a corrosive environment. The time evolution of disbonding and blister initiation and their growth was investigated by analysing the SAM images exposure to an electrolyte solution (Harrison solution). From investigations of a model system of coatings on steel substrates, it was possible to differentiate between water and/or ion transport (i) through the coating and (ii) along the coating-steel interface. For samples without clear coat randomly distributed blisters appeared at the coating-steel interface after exposure to the electrolyte solution, irrespective of the location of initial defects. The random distribution of growing blisters is related to diffusion of water and/or ions through the coating and "nucleation" at weak points of the substrate or within the polymer. For samples with clear coat a propagating migration front along the coating-steel interface of 3-4 µm height -starting from initial defects -was detected. The linear propagation of this front cannot be explained by Fickian diffusion. Therefore, it is discussed in terms of an accelerated diffusion or crack growth kinetics. Since blistering starts only at sites, where the migration front has passed, the presence of a thin water layer at the coating-steel interface, the loss of adhesion and the following corrosive processes are prerequisites for the nucleation of blisters. The blister growth shows a square-root time dependence which was related to a diffusion controlled transport mechanism.

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Section: Fig 7: Measured Expansion Of the Migration Fronts For Samplcontrasting

confidence: 48%

“…This is represented by an induction time in equation 4. Induction times before cathodic blistering have been found before [7]. The data in Fig.…”

Section: Blister Growth Kineticsmentioning

confidence: 73%

Section: Fig 4a-b: A) Topographic Profile (Cross Section) Of Sample mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Investigation of delamination mechanisms in polymer coatings by scanning acoustic microscopy

Alig¹,

Bargmann²,

Oehler³

et al. 2010

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

Interaction of interfacial debonding and under-film corrosion propagation at the edge of the blistering area of epoxy coating

Gao

Huang

et al. 2023

J Coat Technol Res

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Micro-cells beneath organic lacquers: a study using scanning Kelvin probe and scanning acoustic microscopy

Doherty

Sykes

2004

Corrosion Science

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Study of the coating/substrate interface by scanning acoustic microscopy Cathodic disbonding of epoxy-polyamide lacquer from mild steel

Cited by 25 publications

References 6 publications

Investigation of delamination mechanisms in polymer coatings by scanning acoustic microscopy

Investigation of delamination mechanisms in polymer coatings by scanning acoustic microscopy

Interaction of interfacial debonding and under-film corrosion propagation at the edge of the blistering area of epoxy coating

Micro-cells beneath organic lacquers: a study using scanning Kelvin probe and scanning acoustic microscopy

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