The application of X-ray photoelectron spectroscopy to the study of polymer-to-metal adhesion
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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.
KeywordsEpoxy Phosphoric Acid Failure Mode Mild Steel Substrate Surface
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