Organic coatings in simulated flue gas desulfurization environments: Final report
Coatings prepared from the following resin systems and applied to steel were evaluated in simulated flue gas desulfurization environments: nine combinations of epoxy resin and amine hardeners, three vinyl systems, a polyester, a fluoropolymer, a urethane/asphalt and an electrostatically sprayed, fusion-bonded epoxy. The evaluation techniques used on the coatings before and after environmental exposure included: corrosion potential, AC conductance at 2 kHz, DC resistance, weight gain and tensile adhesion. The results for the nine combinations of three epoxy resins and three hardeners exposed to 0.1M H/sub 2/SO/sub 4/, and to H/sub 2/SO/sub 4/ containing other salts and adjusted to pH 0.5, showed that the hardener had more effect on behavior than the resin; a bisphenol A and two novolac resins showed the poorest performance when hardened with a mixed aromatic/aliphatic amine, and the best performance when hardened with an aliphatic or cycloaliphatic amine. Two epoxy systems showed particularly good performance: a bisphenol A hardened with a cycloaliphatic amine and a novolac hardened with an aliphatic amine. The electrostatically applied, fusion-bonded epoxy coating showed no evidence of deterioration of the coating nor corrosion of the substrate after 5000 h exposure to 0.1M H/sub 2/SO/sub 4/. Epoxy and vinyl coatings exhibited no cracking and no corrosion in welded and non-welded areas after thermal cycling twelve times between room temperature and 100 to 120/sup 0/C followed by exposure to acid. The epoxy coatings had better impact resistance after thermal cycling than the vinyl coatings. 15 refs., 20 figs., 23 tabs.
- Research Organization:
- Lehigh Univ., Bethlehem, PA (USA). Center for Surface and Coatings Research; Electric Power Research Inst., Palo Alto, CA (USA)
- OSTI ID:
- 5935933
- Report Number(s):
- EPRI-CS-5449; ON: TI88920047
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
AMINES
CARBAMATES
CARBON STEELS
CARBONIC ACID DERIVATIVES
CARBOXYLIC ACID SALTS
CHEMICAL REACTIONS
COATINGS
COMPARATIVE EVALUATIONS
CORROSION PROTECTION
DESULFURIZATION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EPOXIDES
EQUIPMENT
FLUE GAS
FOSSIL-FUEL POWER PLANTS
GASEOUS WASTES
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS TESTING
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHYSICAL PROPERTIES
POLLUTION CONTROL EQUIPMENT
POLYMERS
POWER PLANTS
PROTECTIVE COATINGS
RESINS
SCRUBBERS
STEELS
TESTING
THERMAL POWER PLANTS
URETHANE
WASTES