Performance of a protective organic coating depends on the performance of its weakest component. It is usually some local region of the protective film, which fails when exposed to particular conditions. Assessing the degradation mode of a particular coating as well as identifying the areas responsible for initiating degradation is a matter of vital importance from a paint manufacturer's point of view. Being able to reveal whether the weakest point is the polymer resin matrix, pigment, or pigment/matrix interface can result in valuable information for paint chemists, indicating the potential areas requiring improvement. In order to obtain such information a suitable measurement technique capable of providing localised results must be employed.
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