Nature of the Adhesion Bond
between Epoxy Adhesive and Steel

V. I. Vettegren’^a*, R. I. Mamalimov^a, A. V. Savitskii^a, I. P. Shcherbakov^a,
V. V. Sytov^b, and V. A. Sytov^b

^a Ioffe Physical Technical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021 Russia
^b Tekhnolog Design and Engineering Bureau, Sovetskii pr. 33a, St. Petersburg, 192076 Russia
*e-mail: Victor.Vettegren@mail.ioffe.ru

Received June 19, 2013

Abstract—The potential difference that appears in the epoxy resin located between two grade 3 steel plates is
studied. One of them is stored in epoxy resin to reach equilibrium, and the second plate is coated with an as-
prepared mixture of epoxy resin with a hardener. It is found that the potential difference decreases in time
because of charge transfer by Fe²⁺ ions through epoxy resin. The luminescence and infrared absorption spectra
of the epoxy adhesive on the grade 3 steel surface are recorded. An analysis of these spectra shows that Fe²⁺
ions penetrate into the as-prepared mixture of epoxy resin with the hardener, and interact with CN groups in the
mixture, and form coordination compounds. As a result, a diffusion layer saturated by the coordination com-
pounds forms at the interface between the steel and the adhesive.

DOI: 10.1134/S106378421403027X

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