THE DEVELOPMENT OF HEAT-RESISTANT PAINTS FOR METALS
SOUTHERN RESEARCH INST BIRMINGHAM ALA
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The program objective is the development of coatings which can be applied to metal under field conditions and will protect the metal during normal atmosphere exposure as well as during and after exposure to 1000 F. Al panels spray-coaed with ZnO-dimethyl hydrogen phosphite-ethyl acid phosphate combinations were weathered for 4 months. Three of 17 coatings were only slighty affected these 3 had been rated as well-bonded, adherent after water immersion and resistant to heating at 1000 F. Initial failure of the coatings appeared associated with crystal formation in the coating. The chief type of failure on weathering as well as on heating was flaking in a small area. Complete loss of coating over a large area also occurred. Coatings with the best properties were cured at 50 relative humidity.