Abstract
Distinguishing between sealants and providing laboratory prognostic tools is essential for qualifying new sealants. Current test methods do not provide adequate discrimination between sealants. A laboratory test based on electrochemical impedance spectroscopy (EIS) supplemented by adhesion strength measurements and examination of sealed, bimetallic surfaces has been developed to give an early indication of sealant performance. Specimens using one of two different nonconductive sealants underwent hot-salt-water exposure followed by EIS measurements, pull strength measurements, and visual inspection. Defective sealant bonded specimens were readily detected by EIS. Absorption of moisture by the sealants was also detected and quantified.
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