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Removal of CaCO[sub 3] extender in residential coatings by atmospheric acidic deposition

Technical Report ·
OSTI ID:7065862
; ; ; ;
The removal and fate of CaCO[sub 3] extender in latex and alkyd paints upon exposure of paint films to UV and atmospheric pollutants generated in a large environmental chamber were studied using optical and scanning electron microscopy in combination with energy dispersive spectroscopy. X-ray mapping of film cross sections was used to examine migration of calcium to the film surface, and x-ray diffraction and Energy Dispersive Spectroscopy (EDS) were employed to determine crystalline nature of surface deposits. Crystals of various forms of calcium sulfate formed on paint surfaces. Surprisingly, migration of calcium to the paint surface occurred in the absence of liquid water in the form of dew.
Research Organization:
North Carolina State Univ., Raleigh, NC (United States)
OSTI ID:
7065862
Report Number(s):
PB-93-120996/XAB; CNN: EPA-R-814121
Country of Publication:
United States
Language:
English

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Related Subjects

1-NITROSO-2-NAPHTHOL
54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ACID RAIN
ALKALINE EARTH METAL COMPOUNDS
AROMATICS
ATMOSPHERIC PRECIPITATIONS
BENCH-SCALE EXPERIMENTS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CALCIUM SULFATES
CARBON COMPOUNDS
CARBONATES
COATINGS
COHERENT SCATTERING
CORROSIVE EFFECTS
CROSS SECTIONS
CRYSTALS
DEPOSITION
DIFFRACTION
ELASTOMERS
ELECTROMAGNETIC RADIATION
ELECTRON MICROSCOPY
ENVIRONMENTAL EFFECTS
FILMS
HYDROXY COMPOUNDS
LATEX
MAPPING
MICROSCOPY
MIGRATION
NAPHTHOLS
NITROSO COMPOUNDS
OPTICAL MICROSCOPY
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
PAINTS
PHENOLS
PHYSICAL RADIATION EFFECTS
POLLUTANTS
POLYMERS
RADIATION EFFECTS
RADIATIONS
RAIN
REAGENTS
REMOVAL
RUBBERS
SCANNING ELECTRON MICROSCOPY
SCATTERING
SULFATES
SULFUR COMPOUNDS
SURFACE PROPERTIES
ULTRAVIOLET RADIATION
X-RAY DIFFRACTION