Degradation of solar coatings observed by scanning electron microscopy
To study the degradation of absorptive coatings used in solar energy systems and thereby aid the development of durability-related test methods for these coatings, scanning electron microscopy (SEM) studies were performed on three solar coating systems and substrates. The coating systems studied were urethane topcoat over epoxy primer on zinc phosphate-treated steel, polyvinylidene fluoride over epoxy primer on galvanized steel, and epoxy topcoat over phenolic butyrate primer on anodized aluminum. The first system was subjected to both exposure to condensing moisture and adhesion tests, the other two systems to high humidity at elevated temperature. The findings show that moisture is a primary factor affecting the durability of the coatings and that SEM is a valuable tool in studying degradation. In addition, the technique of metallographic polishing of galvanized steel with alcohol as a suspension medium is shown to produce microstructure free of metallographic defects.
- Research Organization:
- National Bureau of Standards, Washington, DC
- OSTI ID:
- 6485949
- Journal Information:
- J. Coat. Technol.; (United States), Journal Name: J. Coat. Technol.; (United States) Vol. 52:664; ISSN JCTED
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
141000* -- Solar Collectors & Concentrators
ALLOYS
ALUMINIUM
COATINGS
CORROSION RESISTANCE
ELECTRON MICROSCOPY
ELEMENTS
EPOXIDES
EQUIPMENT
HUMIDITY
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS TESTING
METALS
MICROSCOPY
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PLASTICS
POLYAMIDES
POLYMERS
POLYURETHANES
POLYVINYLS
SCANNING ELECTRON MICROSCOPY
SOLAR ABSORBERS
SOLAR EQUIPMENT
SPRAYED COATINGS
STABILITY
STEELS
SURFACE PROPERTIES
SYNTHETIC MATERIALS
TESTING
ZINC COMPOUNDS
ZINC PHOSPHATES