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Adhesion between coating layers based on epoxy and silicone.

Jacob R Svendsen1, Georgios M Kontogeorgis, Søren Kiil

  • 1IVC-SEP Research Center, CHEC Research Center, Department of Chemical Engineering, Technical University of Denmark, Building 229, DK-2800 Kgs. Lyngby, Denmark.

Journal of Colloid and Interface Science
|September 29, 2007
PubMed
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Adhesion issues in marine epoxy coatings were investigated. Findings suggest poor wetting, surface topography, and mechanical differences, alongside acid-base interactions, influence silicon tie-coat adhesion.

Area of Science:

  • Materials Science
  • Surface Chemistry
  • Corrosion Science

Background:

  • Marine coating systems rely on robust adhesion between layers, such as silicon tie-coats and epoxy primers.
  • Failures in adhesion can compromise the protective integrity of coatings, leading to costly repairs.

Purpose of the Study:

  • To investigate the adhesion mechanisms between silicon tie-coats and various epoxy primers.
  • To identify factors contributing to adhesion problems in marine epoxy coating systems.

Main Methods:

  • Surface tension measurements of tie-coat and critical surface tensions of epoxies.
  • Atomic Force Microscopy (AFM) for surface topography analysis.
  • Pull-off tests for adhesion strength and van Oss-Good theory for surface characterization.

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Main Results:

  • Adhesion strength varied significantly among the six epoxy coatings studied.
  • Inadequate wetting, differing surface topographies, and mechanical property variations were identified as potential causes of adhesion failure.
  • Acid-base interactions, predicted by the van Oss-Good theory, correlated with enhanced adhesion.

Conclusions:

  • Adhesion in silicon/epoxy systems is influenced by a combination of surface energy, topography, and mechanical properties.
  • The van Oss-Good theory provides valuable insights into predicting and understanding epoxy-silicon adhesion in marine environments.