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HEAT RESISTANT CONVERSION COATINGS FOR STEEL
ROCK ISLAND ARSENAL IL
Pagination or Media Count:
Zinc and cadmium oxides were dissolved in 75 phosphoric acid and used separately as stock phosphatizing solutions. They were diluted in the ratio of 1 to 4 and 1 to 8, by volume, or 1 to 15 by weight. Steel wool was dissolved therein to raise the iron content. Zinc and cadmium oxides were made into a slurry with water, converted to the nitrates and added as accelerators. Steel panels were processed in the baths from 30 to 60 minutes at 190 - 195 F to obtain conversion coatings. The panels were divided into two groups. One group was used as the control, the other was heated in an oven at 300 F to determine heat resistance at that temperature. Both groups were evaluated by salt spray tests for their resistance to corrosion. It was found that cadmium coatings applied to the panels in the processing solutions, in the absence of iron and an accelerator, appeared to afford the best resistance to heat.
APPROVED FOR PUBLIC RELEASE