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Typical impedance spectra of a coating during degradation
Low-frequency impedance as a function of exposure time showing three stages of degradation: moisture absorption, incubation, and substrate corrosion
Figure 1
In-Situ Sensor to Detect Moisture Intrusion and Degradation of Coatings, Composites, and Adhesive Bonds, G.D. Davis, C.M. Dacres, and L.A. Krebs, DACCO SCI Inc.