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Intercoat adhesion failure in a multilayer organic coating system: An X-ray photoelectron spectroscopy study

Hinder, SJ, Lowe, C, Maxted, JT, Perruchot, C and Watts, JE (2005) Intercoat adhesion failure in a multilayer organic coating system: An X-ray photoelectron spectroscopy study PROGRESS IN ORGANIC COATINGS, 54 (1). 20 - 27. ISSN 0300-9440

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Abstract

The strength of intercoat adhesion exhibited between a series of polyester/polyurethane (PU) based primer formulations and a standard poly(vinylidene difluoride) (PVdF) based topcoat formulation has been investigated by X-ray photoelectron spectroscopy (XPS). An initial XPS study of changes in surface elemental composition (induced by variation of the peak metal temperature (PMT) achieved during thermal curing), on a subset of the PU primers employed, indicates that beyond a PMT of 232°C changes in PU primer surface composition are negligible. A reference PU primer coating formulation and four variations of this formulation, produced by including, excluding or substituting components/additives in the reference formulation, are characterised by XPS. The PU primer formulation in which a flow agent additive is included exhibits segregation of the flow agent to the primer surface. The PU primer and PVdF topcoat intercoat adhesion failure surfaces resulting from failure at or near the PVdF/PU interface as a result of a peel test are also characterised by XPS. Additionally the PVdF topcoat air-coating surface is characterised by XPS. The interface analyses for the flow agent containing PU primer formulation indicates stripping of the flow agent layer from the PU primer and transfer of the flow agent to the PVdF topcoat interfacial failure surface. Similarly, PU primer formulations in which the concentrations of a crosslinking resin are changed demonstrate that the transfer of carbon and oxygen containing materials from the PU primer to the PVdF topcoat occurs, due to insufficient crosslinking of the polyester component of the PU primer formulation. These results suggest a correlation between the nitrogen concentration at the PU primer surface and the strength of the intercoat adhesion exhibited by the PU primer towards the PVdF topcoat.

Item Type: Article
Additional Information: NOTICE: this is the author’s version of a work that was accepted for publication in Progress in Organic Coatings. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Progress in Organic Coatings, 54(1), September 2005, DOI 10.1016/j.porgcoat.2005.03.012
Uncontrolled Keywords: Science & Technology, Physical Sciences, Technology, Chemistry, Applied, Materials Science, Coatings & Films, Chemistry, Materials Science, intercoat adhesion failure, polymeric coatings, multilayer organic coatings, X-ray photoelectron spectroscopy, HIGH-RESOLUTION XPS, CROSS-LINKING, SEGREGATION, PERFORMANCE, INTERFACE, PROTECTION, CORROSION, STRENGTH, CONCRETE, RESINS
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Divisions: Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Depositing User: Symplectic Elements
Date Deposited: 16 Nov 2012 10:54
Last Modified: 10 Oct 2014 09:21
URI: http://epubs.surrey.ac.uk/id/eprint/738083

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