Offshore Technology Research Center


Abstract ID# :


Report Title:

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

Report Date:

February, 1991
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,┬Ám 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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