Internal coatings stress (ICS) develops in coatings applied to a rigid substrates. During drying, volume changes due to solvent loss and/or cure induces stresses in the films. Differences in the thermal expansion coefficients of the coating and substrate also affect the ICS1 . ICS affects the interfacial adhesion and results in delamination once the stress exceeds the force of adhesion. To measure ICS, a coating is applied to a thin strip of stainless steel and placed into a cantilever deflection apparatus (CDA, Figure 1), and the deflection from the base of the CDA to the bottom of the substrate is measured and incorporated into Corcoran’s equation (Figure 2).

Subject
Vinyls, Substrates, Thickness measurement, Internal stress, Thermal stress, Epoxy coatings, Force, Pretreatment, Deflection, Internal coatings, Coating stress, Stainless steel, Delamination
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2016
Association for Materials Protection and Performance (AMPP)
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