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Main Title Preliminary exposure study to determine the effects of acid deposition on coated steel substrates {microfiche}
Author Moran, P. J. ; Simpson, T. C. ; Hampel, H. ; David, G. D. ; Shaw, B. A.
Other Authors
Author Title of a Work
Moran, Patrick J.
CORP Author Johns Hopkins Univ., Baltimore, MD. ;Martin Marietta Labs., Baltimore, MD. ;Versar, Inc., Columbia, MD.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Publisher U.S. Environmental Protection Agency, Atmosphereic Research and Exposure Assessment Laboratory,
Year Published 1990
Report Number EPA-R-814347-01; EPA/600/3-90/032
Stock Number PB90-201799
Subjects Paint--Air pollution effects ; Acid deposition ; Acid precipitation
Additional Subjects Paints ; Carbon steels ; Degradation ; Exposures ; Test chambers ; Coating processes ; Adhesion ; Sulfur dioxide ; Spectrum analysis ; X ray spectroscopy ; Electrochemistry ; Air pollution effects(Materials) ; Acid gases ; Chemical attack(Degradation) ; National Acidic Precipitation Assessment Program
Library Call Number Additional Info Location Last
NTIS  PB90-201799 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 4 p. ; 30 cm.
The project involves the evaluation of the effects of acidic pollutants on painted metal substrates. The project examined a commercially available alkyd paint/primer system applied to a low carbon steel substrate exposed under a variety of simulated acidic conditions to determine the micro/macro effects of such exposure. The techniques that were identified as those most sensitive and applicable during the study include tensile adhesion testing, electrochemical impedance spectroscopy, and x-ray photoelectron spectroscopy. A novel electrochemical monitor was developed during this program that allowed the continual monitoring of coating degradation during chamber exposure. It was further found that a good correlation existed between tensile adhesion strength measurements and electrochemical impedance parameters. The program determined that the rate of degradation of the alkyd painted steel coupons was accelerated in the presence of SO2. This effect was most pronounced on samples that contained defects (scribes), that were allowed to form condensed (dew) during the exposure period and that had a horizontal orientation during exposure.