Influence of inert pigments on the anti‐corrosive properties of paint films: Part 2

3.2. Water permeation without water accumulation at the pigment/binder interface From the anti‐corrosion point of view it is of course preferable to use pigments which do not accumulate water at the pigment/binder interface when the film is soaked with water. Then water permeation decreases with rising PVC; the anti‐corrosive action should reach an optimum close below (CPVC. In practice such a behaviour is not very often observed. Since there is nearly always a small amount of water accumulated at the pigment/binder interface, a decrease of the degree of corrosion with the PVC until nearly reaching the CPVC can very seldom be noticed.