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RECORD NUMBER: 20 OF 36

OLS Field Name OLS Field Data
Main Title Evaluation of an Atmospheric Damage Function for Galvanized Steel.
Author Haynie, H. ; Spence, J. W. ; Lipfert, F. W. ; Cramer, S. D. ; McDonald., L. G. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab. ;Brookhaven National Lab., Upton, NY.;Bureau of Mines, Albany, OR.
Publisher 1990
Year Published 1990
Report Number EPA/600/D-90/068;
Stock Number PB90-246109
Additional Subjects Galvanized materials ; Steels ; Zinc coatings ; Corrosion tests ; Mathematical models ; Atmospheric corrosion tests ; Air pollution ; Weathering ; Reaction kinetics ; Diffusion ; Films ; Tables(Data) ; Field tests ; Accelerated tests ; Forecasting ; Humidity ; Rain ; Acidity ; Wind velocity ; Carbonates ; Sulfur dioxide ; Environmental tests ; Temperature dependence
Holdings
Library Call Number Additional Info Location Last
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Status
NTIS  PB90-246109 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 12/03/1990
Collation 41p
Abstract
A model for corrosion of zinc based on competing mechanisms of the formation and dissolution of a protective film of basic zinc carbonate was evaluated. The model consists of a diffusivity term (ions through the film) which controls the buildup of a protective film and a solubilization term which controls the rate of dissolution of the film. The model was evaluated by using comprehensive data collected from field experiments designed to separate the effects of wet and dry acid deposition from normal weathering effects such as clean rain, temperature, wind speed, and relative humidity. The data were primarily used to evaluate the theoretically calculated components of the dissolution rate term because after about three years it becomes the rate upon which long-term corrosion behavior may be predicted. The model was also evaluated with respect to historical long-term data for different shapes and sizes of galvanized products. The field data used in the evaluation were found to be consistent with values predicted by the model. Thus, the model can be used with reasonable confidence to predict long-term corrosion behavior of different structures in real environments if the environments are properly described.