Aluminum Coating—Alcoa

12-YEAR INSPECTION RESULTS OF ATMOSPHERIC EXPOSURE TESTS ON METALLIZED ALUMINUM COATED CARBON STEEL PANELS 

BRAZOS RIVER, TEXAS SALT-AIR Base metal not attacked. Sprayed metal intact bat shows a very fiiint yellow y stain on front of panels, with a very li t gray stain and white nut on back. Base metal not attacked. Sprayed metal intact, vinyl seal coat on front of panels shows dull gray blotches. Vinyl seal coat on back of panels is unaffected. Same as Type 2. Same as Type 1. 

EAST CHICAGO, INDIANA INDUSTRIAL Base metal not attacked. Sprayed metal on front or panels shows many piopoiac nodes and a general dark gray deposit stain. Back of panels show a dark gny deposit stain. Base metal not attacked. Sprayed metal intaCL Vinyl seal coat on ont of panels shows a general dark deposit stain. Back shom a chin deposit stain. Same as Type 2. Base metal not attacked. Sprayed metal on both front and back of panels shows many pinpoint nodes and a thick dark deposit stain. 

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Hazardous Decorrp. Prods. Exposed to fire or heat, aluminum trihydroxkte dec. forming aluminum oxide and water vapor b inning at 200 C Storage Keep material dry Hydral Coat 2 [Alcoa]... 

FIG. 4—Photograph of filiform corrosion that occurred on a medicinal Uni-dose cup during compatibility tests with various pharmaceuticals. The cup was formed from 0.15 mm aluminum foil coated with a clear lacquer. Corrosion did not perforate the cup but resuited in contamination of the liquid. (Photograph courtesy of F. S. Bovard, Alcoa Technical Center.)... 

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