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RECORD NUMBER: 3 OF 11

OLS Field Name OLS Field Data
Main Title Atmospheric Corrosion Model for Galvanized Steel Structures.
Author Spence, J. W. ; Haynie, F. H. ; Lipfert, F. W. ; Cramer, S. D. ; McDonald, L. G. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. ;Brookhaven National Lab., Upton, NY. Dept. of Applied Science. ;Bureau of Mines, Albany, OR.
Publisher c1992
Year Published 1992
Report Number EPA/600/J-93/425;
Stock Number PB94-101763
Additional Subjects Galvanized steel ; Atmospheric effects ; Corrosion ; Air pollution ; Surface chemistry ; Environmental effects ; Mathematical models ; Corrosion environments ; Chemical reactions ; Reprints ;
Holdings
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Status
NTIS  PB94-101763 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 02/27/1994
Collation 12p
Abstract
The report develops a model for predicting the corrosion of galvanized steel structures, based on two competing mechanisms: the formation and dissolution of the basic zinc-carbonate film that forms on zinc surfaces. The model consists of a diffusivity term that describes film growth and a dissolution term that describes the rate of film removal. Dissolution becomes the rate-determining process for predicting the long-term corrosion behavior of galvanized steel structures. The model's dissolution term predicted the long-term corrosion of galvanized steel with reasonable accuracy. For further evaluation, the dissolution model was applied to historical, long-term corrosion data of galvanized steel products, taking into account their sizes and shapes. The field data used in this evaluation were found to be consistent with corrosion rates predicted by the model, within the limits of uncertainty of the environmental data. Thus the model can be used with reasonable confidence to predict corrosion behavior of different structures if environmental conditions can be properly described.