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You are here: Home / Research / Publications / Mechanics of Materials / Comparing EIS Methods for Estimating the Degree of Delamination of Organic Coatings on Steel

Comparing EIS Methods for Estimating the Degree of Delamination of Organic Coatings on Steel

Abstract ID#:
A20

 

Report Title:
Comparing EIS Methods for Estimating the Degree of Delamination of Organic Coatings on Steel

 

Authors:
S.A. McCluney, S.N. Popova, B.N. Popov, R.E. White, and R.B. Griffin, Texas A&M University

 

Report Date:
July, 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 mm and surface areas of 78.5 cm2 were used. Coating parameters were obtained using a circuit-analog model. The area of delamination was estimated using several EIS parameters, including the pore resistance and the break point frequency. These values were compared to the corroded area determined visually. All methods considered exhibited a strong correlation over some or all of the range of exposure times.

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