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Author
Lin, C. | Nguyen, T.
Title
Electrochemical Technique for Rapidly Evaluating Protective Coatings on Metals. Technical Note (Final).
Coporate
National Institute of Standards and Technology, Gaithersburg, MD Xiamen Univ., People's Republic of China
Report
NIST TN 1253, October 1988,
Distribution
Available from National Technical Information Service
Keywords
predictive models | organic coatings; corrosion prevention; tests; metal coatings; alkyd resins; acrylic resins; steels; contamination; performance evaluation; polarization; electrochemistry
Abstract
A new electrochemical technique based on multicyclic scanning potentials applied to a specimen in an electrolyte was developed and evaluated as a method for rapidly evaluating the corrosion protection performance of organic coatings on metal. Opaque alkyd and clear acrylic coated steel samples prepared at different thicknesses, curing conditions, defect inclusions, and contamination concentrations were used for the evaluation. The applied potentials were between -1.8 and +1.8 V, and the electrolyte was a 3% NaCl solution. Preliminary results indicate that the technique is useful for evaluating the corrosion protection properties of organic coatings on steel. The technique appears to offer a number of advantages: fast and in situ measurements, good reproducibility, high sensitivity, and minimal damage to the coating.