Adhesion characterization of decorative coatings by scratch testing using a wedge blade indenter
Strong adhesion is essential to maintain both the appearance and long-term durability of decorative coatings. This report demonstrates how scratch testing with a wedge blade indenter can serve as a complementary method to the conventional Rockwell-based scratch approach.
Decorative coatings serve both aesthetic and protective functions across a wide range of applications. In architecture, they enhance building facades, providing durability under changing weather conditions while remaining cost-effective and easy to apply. For industrial products, they offer strong adhesion to metal surfaces, customizable appearance, and easy-to-clean finishes, supporting performance and economic viability. To ensure long-term reliability, decorative coatings must
remain strongly bonded to their substrates and resist mechanical damage. Scratch resistance (cohesive failure within the coating layer) and adhesion (adhesive failure at the coating-substrate interface) are therefore fundamental properties for evaluating coating quality.
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