Pull-off adhesion testing is a commonly used method to determine the coating adhesion strength. Relying on the pull-off adhesion testing technique to determine the coating adhesion strength is increasingly common due to its quantitative result. This study focuses on how the pull-off adhesion strength value of the coating is affected by the change in critical factors i.e. surface profile morphology (spherical, sharp & angular) and a range of surface roughness profile height (μm). Test sample surface was prepared to visually clean steel with diverse sizes and shapes of abrasives, coated with a 3 coat system. Pull-off adhesion testing was performed on the fresh coating and after exposing the coating to cyclic ageing test conditions adopted from ISO12944-9, Annex B. Additionally, electrochemical impedance spectroscopy (EIS) and surface characterization of abrasives using scanning electron microscopy (SEM) and cross sectional analysis of coating sample after ageing with SEM-EDS (Scanning electron microscopy-Energy dispersive spectroscopy) were also performed.

Subject
Coating performance, Coatings, Substrates, Glass, Abrasives, Roughness, Beads, Pull off adhesion test, Garnet, Coating adhesion, Mechanical failure, Surface profile, Samples
Keywords:
Coatings, surface profile, pull-off adhesion test, adhesion strength, organic coatings
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2023
Association for Materials Protection and Performance (AMPP)
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