The effect of interfacial chemistry on coating adhesion and performance: A mechanistic study using aminobutylphosphonic acid

T. A. Al-Khaldi, S. B. Lyon

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Failure of adhesion of organic coating (paints) to steel and other metallic substrates is one of the key mechanisms for local coating failure and for consequent restriction of coating lifetime. This study thus focuses on modification to the chemistry of the metal interface in order to promote enhanced (dry and wet) coating adhesion. The work uses an appropriate bi-functional amino alkyl phosphonate to provide the desired interfacial properties. The study uses X-ray photoelectron spectroscopy and water contact angle measurement to examine changes in the interfacial surface chemistry and electrochemical impedance spectroscopy and cathodic disbonding to determine improvements to the anti-corrosion performance. Choosing 4-amino-butyl- phosphonic acid as the surface modifier a significant influence on its efficiency as an adhesion promoter was observed as a function of pH. Thus, when the amino group was protonated at a pH of 5.3, the molecule demonstrated attachment to carbon steel at both ends with no significant improvement in performance. However at pH 8 the molecule demonstrated greatly improved surface packing density with the amino group outwards from the surface in the preferred orientation. In this condition, an epoxy coating demonstrated substantial resistance to interfacial hydrolysis with overall improved adhesion and reduced cathodic disbondment rate. © 2012 Published by Elsevier B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)449-455
    Number of pages6
    JournalProgress in Organic Coatings
    Volume75
    Issue number4
    DOIs
    Publication statusPublished - Dec 2012

    Keywords

    • Adhesion promoter
    • Self assembled monolayer

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