Laboratory study to evaluate the impact of NOx, SOx, and oxidants on the atmospheric corrosions of galvanized steel

Technical Report · Thu May 01 04:00:00 EDT 1986

OSTI ID:5755687

Edney, E O; Stiles, D C; Spence, J W; Haynie, F H; Wilson, W E

A series of laboratory experiments was conducted in which galvanized steel exposed to NO/sub 2/ in air and irradiated propylene/nitrogen oxides/air mixtures in the absence and presence of SO/sub 2/. Dew was produced periodically on the test panels, and at the end and/or during the experiments, panels were sprayed with either deionized water or an ammonium bisulfate solution (pH of 3.5). Gas-phase concentrations were monitored, and dew and rain-rinse samples were analzed for nitrite, nitrate, sulfite, sulfate, formaldehyde, and zinc. The average deposition velocities measured during periods of wetness were sulfur dioxide, 0.8 cm/s; formaldehyde, 0.6 cm/s; nitric acid, 0.7 cm/s; and nitrogen dioxide, 0.03 cm/s. Analysis of dew samples suggests that the dry deposition of sulfur dioxide, nitric acid, formaldehyde, and possibly nitrogen dioxide accelerates the atmospheric corrosion of galvanized steel. Wet deposition of acidic species accelerates corrosion. A general model for the atmospheric corrosion of galvanized steel is presented.

• Research Organization: Northrop Services, Inc., Research Triangle Park, NC (USA)
• OSTI ID: 5755687
• Report Number(s): PB-86-193687/XAB
• 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
AIR
ALLOYS
ATMOSPHERIC PRECIPITATIONS
CHALCOGENIDES
CHEMICAL REACTIONS
CORROSION
CORROSIVE EFFECTS
FLUIDS
GASES
IRON ALLOYS
IRON BASE ALLOYS
NAPAP
NITROGEN COMPOUNDS
NITROGEN DIOXIDE
NITROGEN OXIDES
OXIDES
OXIDIZERS
OXYGEN COMPOUNDS
RAIN
STEELS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES