Environmental Integrity of Coating/Metal Interface

Abstract

The role of chemical electrochemical reactions at the coating/metal interface in the region of a cathodic disbond in degrading adhesion of organic coatings to steel has been studied using scanning acoustic microscopy, wetting analysis and x-ray photo-electron spectroscopy (XPS). The results show that cathodic polarization accelerates adhesion loss by the combined effects of a shift in the zeta potential of the steel substrate and build-up of an alkaline sodium hydroxide electrolyte that chemically degrades the polymer. Cathodic formation of sodium hydroxide not only degrades the polymer, but also lowers the surface tension of the electrolyte so as to favor displacement of the polymer. A mechanism of interfacial bond rupture made irreversible by polymer degradation is proposed.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1990
Accession Number
ADA222426

Entities

People

  • J. Lumsden
  • M. Kendig
  • P. Stocker
  • R. Addison
  • S. Jeanjaquet

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Adhesion
  • Chemical Synthesis
  • Chemistry
  • Coatings
  • Corrosion Resistance
  • Electrochemical Reactions
  • Electron Spectroscopy
  • Hydroxides
  • Material Degradation Processes
  • Organic Coatings
  • Polymer Degradation
  • Polymers
  • Sodium Hydroxide
  • Spectroscopy
  • Surface Chemistry
  • Surface Roughness
  • Surface Tension

Fields of Study

  • Materials science

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Materials Science (Mechanical Engineering).
  • Thin Film Deposition Science.

Technology Areas

  • Microelectronics