Abstract
Following a brief discussion of the effects of water and corrosion on paint adhesion, recent surface analytical studies of the interfacial chemistry of paint adhesion loss are reviewed. Mechanical and corrosion induced de-adhesion have been studied for model coatings, including melamine- formaldehyde crosslinked epoxy ester formulations and air oxidizing polybutadienes. Corrosion-induced de-adhesion is associated with chemical degradation of the organic polymers, e.g., by saponification of ester linkages. Similar results have been reported for painted conversion coated steel. Mechanical, moisture induced, and corrosion induced adhesion loss have been compared for polybutadiene coatings. Mechanical de-adhesion results in cohesive coating failure. Moisture induced de-adhesion occurs closer to the substrate/ coating interface, but with little or no chemical degradation. Corrosion induced de-adhesion involves formation of ionic resin degradation products, principally carboxylates.
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