RANDOM EXPERIMENTS ON ENAMEL ADHERENCE*

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Abstract
The results of various experiments dealing with the behavior of ground‐coat enamels are given. Hydrogen causes metallic nickel or iron to separate from regular molten ground coats, while the gases evolved from sheet iron cause metallic copper to form from molten copper‐bearing glasses and metallic iron to form from regular molten ground coats. Ground coats have only a slight volatilization loss at 1600°F. Because CuO decomposes when heated in absence of oxygen or with iron or FeO, the various experiments performed suggest that glass solutions of CuO are oxidizing and are reduced by such reducing agents as H2, CO, FeO, CoO, NiO, MnO, and Fe.

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