Coating laboratories can spend immense time and resources screening various additives to remedy defects on cured surface coatings. However, in some cases, the powder coating processing from extrusion to spray application may be the cause of significant changes in defects for powder coating systems, resulting in early film failure. We compared various preparation methods to changes in surface appearance and physical performance for various exterior topcoat powder systems over metallic substrates. This study will utilize accelerated corrosion testing to evaluate how a powder system's preparation can affect the topcoat's overall performance in exterior weathering.

Subject
Water uptake, Test methods, Electrochemical impedance spectroscopy, Coating performance, Coating application, Coatings, Materials, Impedance, Substrate surfaces, Powder coatings, Powders, Paints, Resins
Keywords:
EIS, coatings performance, processing conditions, powder coating
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2023
Association for Materials Protection and Performance (AMPP)
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