Preliminary exposure study to determine the effects of acid deposition on coated steel substrates. Final report

Technical Report · Sun Apr 01 04:00:00 EDT 1990

OSTI ID:7047596

Moran, P J; Simpson, T C; Hampel, H; David, G D; Shaw, B A

The project involves the evaluation of the effects of acidic pollutants on painted metal substrates. The project examined a commercially available alkyd paint/primer system applied to a low carbon steel substrate exposed under a variety of simulated acidic conditions to determine the micro/macro effects of such exposure. The techniques that were identified as those most sensitive and applicable during the study include tensile adhesion testing, electrochemical impedance spectroscopy, and x-ray photoelectron spectroscopy. A novel electrochemical monitor was developed during this program that allowed the continual monitoring of coating degradation during chamber exposure. It was further found that a good correlation existed between tensile adhesion strength measurements and electrochemical impedance parameters. The program determined that the rate of degradation of the alkyd painted steel coupons was accelerated in the presence of SO2. This effect was most pronounced on samples that contained defects (scribes), that were allowed to form condensed (dew) during the exposure period and that had a horizontal orientation during exposure.

• Research Organization: Johns Hopkins Univ., Baltimore, MD (USA)
• OSTI ID: 7047596
• Report Number(s): PB-90-201799/XAB
• Country of Publication: United States
• Language: English

Related Subjects

29 ENERGY PLANNING, POLICY, AND ECONOMY
290300 -- Energy Planning & Policy-- Environment
Health
& Safety
36 MATERIALS SCIENCE
360604 -- Materials-- Corrosion
Erosion
& Degradation
54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ACID RAIN
ADHESION
AIR POLLUTION
ALLOYS
ATMOSPHERIC PRECIPITATIONS
CARBON STEELS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
COATINGS
CORROSION
DOCUMENT TYPES
ECONOMIC IMPACT
ELECTROCHEMISTRY
ENVIRONMENTAL EFFECTS
EXPOSURE CHAMBERS
IRON ALLOYS
IRON BASE ALLOYS
NAPAP
OXIDES
OXYGEN COMPOUNDS
PAINTS
POLLUTION
PROGRESS REPORT
RAIN
SIMULATION
SPECTROSCOPY
STEELS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
X-RAY SPECTROSCOPY