- Author
-
Nguyen, T.
|
Bentz, D.
|
Byrd, W. E.
- Title
- Quantitative Studies of Coatings on Steel Using Reflection/Absorption Fourier Transform Infrared Spectroscopy.
- Coporate
- National Bureau of Standards, Gaithersburg, MD
- Book or Conf
- Polymeric Materials Science and Engineering. ACS Division of Polymeric Materials: Science and Engineering. Proceedings. Volume 55. Fall Meeting. 1986,
American Chemical Society, Washington, DC,
Anaheim, CA,
1986
- Keywords
-
infrared spectroscopy; thin films; steels; absorption; reflection; epoxy resins; coatings; quantitative analysis; nondestructive tests; reprints
- Abstract
- Reflection/absorption infrared spectroscopy (RAS), commonly referred to as external reflection infrared spectroscopy, has become a powerful, nondestructive technique for studies of thin and thick films on metal surfaces. The intensity and shape of the absorption bands obtained by the technique are different from those obtained by the conventional transmission technique and are a complex function of numerous parameters. The theory of RAS is valid only for very thin films and for a particular substrate/film system; for thick films, the theory deviates from experimental data. In the paper, the relationships between band intensities, angles of incidence, and film thicknesses of an amine-cured epoxy coating on cold-rolled steel are examined using reflection/absorption Fourier transform infrared spectroscopy. Mathematical expressions are developed to describe the relationships for thick films of a steel/epoxy system.