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Journal of Coatings Technology and Research

Erschienen in:

01.11.2010

Reduction of cathodic delamination rates of anticorrosive coatings using free radical scavengers

verfasst von: P. A. Sørensen, C. E. Weinell, K. Dam-Johansen, S. Kiil

Erschienen in: Journal of Coatings Technology and Research | Ausgabe 6/2010

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Abstract

Cathodic delamination is one of the major modes of failure for anticorrosive coatings subjected to a physical damage and immersed in seawater. The cause of cathodic delamination has been reported to be the result of a chemical attack at the coating–steel interface by free radicals and peroxides formed as intermediates in the cathodic reaction during the corrosion process. In this study, antioxidants (i.e., free radical scavengers and peroxide decomposers) have been incorporated into various generic types of coatings to investigate the effect of antioxidants on the rate of cathodic delamination of epoxy coatings on cold rolled steel. The addition of <5 wt% free radical scavengers to epoxy coatings improved the resistance toward cathodic delamination by up to 50% during seawater immersion, while peroxide decomposers had a limited effect. Testing using substrates prepared from stainless steel, copper, aluminum, galvanized steel, and brass also showed a reduction in the rate of cathodic delamination when the coating was modified with a free radical scavenger. The protective mechanism of free radical scavengers investigated for the primers are similar to that of antioxidants used for protection against photochemical degradation by UV-radiation of top coatings. Both substrate corrosion and degradation of a coating exposed to UV-radiation lead to the formation of free radicals as reactive intermediates.

Vorheriger Artikel Preparation of core–shell latex particles by emulsion co-polymerization of styrene and butyl acrylate, and evaluation of their pigment properties in emulsion paints

Nächster Artikel Study of the mechanical and structural properties of Zn–Ni–Co ternary alloy electroplating

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Titel: Reduction of cathodic delamination rates of anticorrosive coatings using free radical scavengers
verfasst von: P. A. Sørensen
C. E. Weinell
K. Dam-Johansen
S. Kiil
Publikationsdatum: 01.11.2010
Verlag: Springer US
Erschienen in: Journal of Coatings Technology and Research / Ausgabe 6/2010
Print ISSN: 1547-0091
Elektronische ISSN: 1935-3804
DOI: https://doi.org/10.1007/s11998-010-9267-0

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