Effects of acid deposition on painted wood substrates
This research program identifies early failure processes associated with acidic deposition on painted-wood-substrate systems. Effects observed during short-term accelerated exposure studies are as follows: FTIR, NMR, and Sol-gel analysis indicate that SO{sub 2} attacks the base terpolymer of latex polymeric coating in the presence of UV radiation. The polymer is stable upon exposure to SO{sub 2} alone, either gaseous or aqueous as sulfurous acid. Sulfurous acid diffuses through both oil-alkyd and latex coatings and can degrade lignin of the wood substrate. Field and laboratory studies indicate that CaCO{sub 3} and ZnO are removed from latex paints during exposures. The removal rate decreases with increasing pH. Discoloration or yellowing of CaCO{sub 3} containing paints on wood substrates was observed after three months field exposure. Based on the findings, it is recommended that research be continued to develop dose-response relationships for the effects of acid deposition on coated-wood-substrate systems.
- Research Organization:
- North Carolina State Univ., Raleigh, NC (USA)
- OSTI ID:
- 5410402
- Report Number(s):
- PB-89-220024/XAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
ACID RAIN
PAINTS
WEATHERING
WOOD
AIR POLLUTION
CALCIUM CARBONATES
COATINGS
DIFFUSION
LATEX
LIGNIN
PH VALUE
POLYMERS
RESINS
SULFUR DIOXIDE
SULFUROUS ACID
ULTRAVIOLET RADIATION
ZINC OXIDES
ALKALINE EARTH METAL COMPOUNDS
ATMOSPHERIC PRECIPITATIONS
CALCIUM COMPOUNDS
CARBOHYDRATES
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
ELASTOMERS
ELECTROMAGNETIC RADIATION
HYDROGEN COMPOUNDS
INORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXIDES
OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
POLLUTION
POLYSACCHARIDES
RADIATIONS
RAIN
RUBBERS
SACCHARIDES
SULFUR COMPOUNDS
SULFUR OXIDES
ZINC COMPOUNDS
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)
360604 - Materials- Corrosion
Erosion
& Degradation