Record Display for the EPA National Library Catalog


Main Title Derivation of a Damage Function for Galvanized Steel Structures: Corrosion Kinetics and Thermodynamic Considerations.
Author Spence, J. W. ; Haynie, F. H. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Publisher 1990
Year Published 1990
Report Number EPA/600/D-90/030;
Stock Number PB90-221888
Additional Subjects Atmospheric corrosion ; Corrosion mechanisms ; Galvanized materials ; Steels ; Chemical attack ; Oxidation ; Artificial weathering tests ; Galvanic corrosion ; Steel structures ; Chemical reactions ; Mathematical models ; Electrochemistry ; Corrosion ; Damage assessment ;
Library Call Number Additional Info Location Last
NTIS  PB90-221888 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 40p
A damage function for predicting the corrosion of galvanized steel structures by wet and dry deposition has been developed from thermodynamics and kinetics of atmospheric corrosion chemistry. The function mathematically expresses the competing reactions for the build up and dissolution of the basic zinc carbonate corrosion film with exposure time. Major findings as expressed by the theoretical function are as follows: (1) During periods of surface wetness, SO2 reaching the surface reacts stoichiometrically with the zinc, (2) Rain acidity reacts stoichiometrically with the zinc, (3) The corrosion film of basic zinc carbonate is soluble in clean rain. The dissolution depends on the residence time of rain on the galvanized steel surface, and (4) Deposition velocity controls the rate of corrosion of galvanized steel structures by gaseous SO2 during periods of wetness. The manuscripts recommend testing the applicability of the proposed damage function with field corrosion data that is being acquired by the Bureau of Mines and the U.S. Environmental Protection Agency and with corrosion data from prior field exposure studies. In this manner a validated damage function should be developed for conducting an assessment of acid deposition to galvanized steel structures.