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Using the model representations for the mechanism of destruction of nonmetallic coatings in chemically active media proposed in previous papers by the authors a description of the osmotic and corrosion effects that influence the destruction of coatings is given. We study the loss of ability of coatings to function due to destruction of cohesion and adhesion.In a previous paper [1] the authors delineated the fundamental stages in the process of wear of nonmetallic coatings in electrochemically active media up to the loss of protective properties. In that paper we also gave computations of the time required for defects (cavities) under the coating to be filled with a water solution of the contacting medium and the geometric dimensions of the corrosion sites at various stages of weal'.In this paper we proposed a mathematical description of the osmotic and corrosion effects at sites under the coating, making it possible to use the results obtained earlier [1] to determine the characteristic points in the wear up to the loss of working capacity of the coating due to destruction of cohesion and adhesion.

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