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Reliable quantitative assessment of in-service capabilities of metal protection paint systems has been impeded in part by difficulties in characterizing the relevant compositional, physical, and environmental variables; but, more significantly, by the lack of a working theory of paint system weathering that incorporates the variables according to their significance. Observations of many paint systems over many years in various environments have suggested the generalization that degradation of most paint systems over a time period can be described by an S-shaped curve. A rational application of rate theory leads to a general equation for paint system performance. Important refinements to this equation may be developed in time, but for the present, emphasis is directed toward elucidating a methodology that coatings engineers may begin to use immediately.
building materials, durability, metal protective paints, performance testing, weathering theory, generalized correlation, environmental testing, mathematical models, standard materials, corrosion resistance, engineering design, paint systems
Principal engineer, Micro-Metrics Company, Atlanta, Ga.