Study of commercially available epoxy protective coatings by using non-destructive electrochemical techniques.

P.R. SERÉ; D.M. SANTÁGATA; A.R. DI SARLI; C.I. ELSNER

CORROSION REVIEWS - (Print)

FREUND PUBLISHING HOUSE LTD

Lugar: Tel Aviv; Año: 1996 vol. 14 p. 85 - 94

0334-6005

SAE 1020 steel panels coated with different thicknesses of either epoxy-bituminous or epoxy enamel films of commercial quality in a naturally aereated 3% NaCl solution were investigated. The progression of corrosion as a function of exposure time was studied with electrochemical impedance spectroscopy and corrosion potential measurements. Simultaneously, both the salt spray cabinet test (ASTM Standard D 117/79) and the monitoring of the rusting grade (ATM standard D 610/85) were also performed. Based on the overall experimental results, the coatings have been ranked in terms of the effectiveness properties in a chloride containing electrolyte. Furthermore, a comparison of the visual assessment, water permeability, impedance and corrosion potential data indicates that the non-destructive and fairly straightforward electrochemical techniques are a very powerful tool for studying the highly complex metal/organic coating/aqueous electrolyte interface.