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The application of X-ray photoelectron spectroscopy to the study of polymer-to-metal adhesion

Part 3 The influence of substrate surface chemistry on the cathodic disbondment process

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Abstract

The cathodic disbondment of a fusion-bonded epoxy coating applied to mild steel treated with a phosphoric acid wash has been investigated. The interfacial chemistry of disbondment has been studied by X-ray photoelectron spectrscopy (XPS), which shows the locus of failure to alternate between cohesive failure of the polymer coating and a phosphate-bearing layer. The kinetics of delamination are substantially reduced compared with data obtained for epoxy applied to a bare steel substrate. It is concluded that the application of an acid wash treatment results in a stronger, more durable, polymer-to-substrate bond. The process parameters of the wash treatment control both the substrate surface chemistry prior to coating and the eventual failure mode.

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Watts, J.F. The application of X-ray photoelectron spectroscopy to the study of polymer-to-metal adhesion. J Mater Sci 19, 3459–3465 (1984). https://doi.org/10.1007/BF00549839

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Keywords

  • Epoxy
  • Phosphoric Acid
  • Failure Mode
  • Mild Steel
  • Substrate Surface