Influence of substrate topography on cathodic delamination of anticorrosive coatings

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Abstract

The cathodic delamination of a commercial magnesium silicate and titanium dioxide pigmented epoxy coating on abrasive cleaned cold rolled steel has been investigated. The rate of delamination was found to depend on interfacial transport from the artificial defect to the delamination front and thereby the substrate topography, whereas the coating thickness had little influence. The presence of a significant potential gradient between the anode and the cathode and the dependency of the delamination rate on the tortuosity of the steel surface suggests that cathodic delamination is controlled by migration of cations from the defect to the delamination front. This means that abrasive blasting, to some extent, can be applied to control and minimize the observed rate of cathodic delamination. The lifetime of the species causing disbondment suggested that sodium hydroxide or potassium hydroxide and not peroxide species or radicals are the causative agents at free corrosion potential (i.e. without impressed current).
Original languageEnglish
JournalProgress in Organic Coatings
Volume64
Issue number2-3
Pages (from-to)142-149
ISSN0300-9440
DOIs
Publication statusPublished - 2009

Cite this

@article{9100eff385d2473b9e3777f595cf74ef,
title = "Influence of substrate topography on cathodic delamination of anticorrosive coatings",
abstract = "The cathodic delamination of a commercial magnesium silicate and titanium dioxide pigmented epoxy coating on abrasive cleaned cold rolled steel has been investigated. The rate of delamination was found to depend on interfacial transport from the artificial defect to the delamination front and thereby the substrate topography, whereas the coating thickness had little influence. The presence of a significant potential gradient between the anode and the cathode and the dependency of the delamination rate on the tortuosity of the steel surface suggests that cathodic delamination is controlled by migration of cations from the defect to the delamination front. This means that abrasive blasting, to some extent, can be applied to control and minimize the observed rate of cathodic delamination. The lifetime of the species causing disbondment suggested that sodium hydroxide or potassium hydroxide and not peroxide species or radicals are the causative agents at free corrosion potential (i.e. without impressed current).",
author = "S{\o}rensen, {Per Aggerholm} and S{\o}ren Kiil and Kim Dam-Johansen and {Erik Weinell}, Claus",
year = "2009",
doi = "10.1016/j.porgcoat.2008.08.027",
language = "English",
volume = "64",
pages = "142--149",
journal = "Progress in Organic Coatings",
issn = "0300-9440",
publisher = "Elsevier",
number = "2-3",

}

Influence of substrate topography on cathodic delamination of anticorrosive coatings. / Sørensen, Per Aggerholm; Kiil, Søren; Dam-Johansen, Kim; Erik Weinell, Claus.

In: Progress in Organic Coatings, Vol. 64, No. 2-3, 2009, p. 142-149.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Influence of substrate topography on cathodic delamination of anticorrosive coatings

AU - Sørensen, Per Aggerholm

AU - Kiil, Søren

AU - Dam-Johansen, Kim

AU - Erik Weinell, Claus

PY - 2009

Y1 - 2009

N2 - The cathodic delamination of a commercial magnesium silicate and titanium dioxide pigmented epoxy coating on abrasive cleaned cold rolled steel has been investigated. The rate of delamination was found to depend on interfacial transport from the artificial defect to the delamination front and thereby the substrate topography, whereas the coating thickness had little influence. The presence of a significant potential gradient between the anode and the cathode and the dependency of the delamination rate on the tortuosity of the steel surface suggests that cathodic delamination is controlled by migration of cations from the defect to the delamination front. This means that abrasive blasting, to some extent, can be applied to control and minimize the observed rate of cathodic delamination. The lifetime of the species causing disbondment suggested that sodium hydroxide or potassium hydroxide and not peroxide species or radicals are the causative agents at free corrosion potential (i.e. without impressed current).

AB - The cathodic delamination of a commercial magnesium silicate and titanium dioxide pigmented epoxy coating on abrasive cleaned cold rolled steel has been investigated. The rate of delamination was found to depend on interfacial transport from the artificial defect to the delamination front and thereby the substrate topography, whereas the coating thickness had little influence. The presence of a significant potential gradient between the anode and the cathode and the dependency of the delamination rate on the tortuosity of the steel surface suggests that cathodic delamination is controlled by migration of cations from the defect to the delamination front. This means that abrasive blasting, to some extent, can be applied to control and minimize the observed rate of cathodic delamination. The lifetime of the species causing disbondment suggested that sodium hydroxide or potassium hydroxide and not peroxide species or radicals are the causative agents at free corrosion potential (i.e. without impressed current).

U2 - 10.1016/j.porgcoat.2008.08.027

DO - 10.1016/j.porgcoat.2008.08.027

M3 - Journal article

VL - 64

SP - 142

EP - 149

JO - Progress in Organic Coatings

JF - Progress in Organic Coatings

SN - 0300-9440

IS - 2-3

ER -