Controlled field study to determine the impact of dry and wet deposition of air pollutants on the corrosion rate of galvanized steel

Conference · Thu Jan 01 04:00:00 EST 1987

OSTI ID:7005667

Edney, E O; Stiles, D C; Corse, E W; Wheeler, M L; Spence, J W

A field study was conducted at Research Triangle Park, NC, in which test panels of galvanized steel were exposed under the following conditions: (1) total deposition, (2) dry deposition only, and (3) dry deposition and clean wet deposition. Rain and rain runoff samples were collected for 44 rain events and analyzed for Cl/sup -/, NO/sub 3//sup -/, SO/sub 4//sup =/, and Zn. The runoff data were statistically analyzed to determine the correlations between the Zn dissolved and the anions in the rain runoff. Much of the Zn dissolved under total and dry plus clean wet deposition conditions can be accounted for by dry and wet deposition of S species and their subsequent surface reactions with Zn compounds. The uncertainty in the stoichiometric coefficient for NO/sub 3//sup -/ was such that it was not possible to determine the impact of HNO/sub 3/ on the atmospheric corrosion rate of galvanized steel. The difference between the amount of Zn dissolved under the total deposition condition versus that found under the dry plus clean wet deposition demonstrates that ambient wet deposition enhanced the Zn dissolution rate, suggesting that the enhancement was caused by impurities in the rain.

• OSTI ID: 7005667
• Report Number(s): CONF-870314-
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ACID RAIN
ALLOYS
ATMOSPHERIC PRECIPITATIONS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CORROSION
CORROSION RESISTANCE
CORROSIVE EFFECTS
DISSOLUTION
ELEMENTS
ENVIRONMENTAL EFFECTS
HALIDES
HALOGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
KINETICS
METALS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
RAIN
REACTION KINETICS
STEELS
SULFUR COMPOUNDS
SULFUR OXIDES
TEST FACILITIES
ZINC