Evaluation of the Degree of Delamination of Organic Coatings on Steel Using Electrochemical Impedance Spectroscopy
N. Popova, S.A. McCluney, B.N. Popov, R.E. White, T. Pandorf, and R.B. Griffin, Texas A&M University
Electrochemical Impedance Spectroscopy (EIS) was used to evaluate the degree of delamination of the epoxy primer Uniprime ED-4* electrocoated on phosphate treated cold-rolled steel in 3.5% NaCl exposed to air. Specimens with coating thicknesses of 20.3 and 20.8,µm and surface areas of 78.5 cm2 were used. Good agreement was obtained between the degree of delamination determined by EIS and by visual inspection according to ASTM D-610. The breakpoint frequency was used to determine the degree of delamination.
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