The effects of sheltering and orientation on the atmospheric corrosion of structural metals
The Bureau of Mines, US Department of the Interior, is conducting atmospheric corrosion tests on five alloys and two coated steel products at five sites as part of the National Acid Precipitation Assessment Program. Samples tested are boldly exposed to the atmosphere, sheltered from the atmosphere, and facing skyward and groundward. Details of the corrosion process related to orientation and sheltering and involving particulates, corrosion film chemistry and morphology, and the dissolution/reprecipitation process were established. The corrosion film on zinc saturates with sulfur at -- 7 wt% with increasing ambient sulfur dioxide concentration. Zinc corrosion on the skyward side appears to be cathodically protected in two-sided bold exposures. Only large particulates are present on the surface of sheltered copper and zinc; small particulates dissolve and disperse into the corrosion film. The dissolution/reprecipitation process occurs primarily during the final stages of drying.
- Research Organization:
- M and DP Associates Inc., Hyattsville, MD 20782
- OSTI ID:
- 5796679
- Journal Information:
- Mater. Performance; (United States), Vol. 26:7
- Country of Publication:
- United States
- Language:
- English
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Effects of sheltering and orientation on the atmospheric corrosion of structural metals
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Related Subjects
54 ENVIRONMENTAL SCIENCES
ACID RAIN
ENVIRONMENTAL EFFECTS
ALLOYS
CORROSION
STEELS
BUILDING MATERIALS
CATHODIC PROTECTION
CHEMICAL REACTION KINETICS
CORROSIVE EFFECTS
DISSOLUTION
EXPERIMENT PLANNING
METALS
PARTICULATES
SULFUR
SULFUR DIOXIDE
ZINC
ATMOSPHERIC PRECIPITATIONS
CHALCOGENIDES
CHEMICAL REACTIONS
CORROSION PROTECTION
ELEMENTS
IRON ALLOYS
IRON BASE ALLOYS
KINETICS
MATERIALS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PLANNING
RAIN
REACTION KINETICS
SULFUR COMPOUNDS
SULFUR OXIDES
360604* - Materials- Corrosion
Erosion
& Degradation
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)