Abstract
A method of testing the adhesiveness of vitreous enamels to metal is developed. The test specimens are prepared by clamping together two strips of enameled metal while they are still in the furnace and allowing them to cool slowly in another furnace from a temperature of 500°C. The test consists of determining the force necessary to pull the two metal pieces apart when treated as a continuous strip of metal under tensile stress. As a source of additional data in analyzing results, an estimate is made of the percentage of contact area on each specimen within which failure occurred in the bond. The adhesiveness of an enamel containing cobalt, manganese, and nickel oxides is compared with the enamel minus these oxides. The cobalt enamel gave a much stronger bond than the cobaltless enamel, a result which ie in agreement with industrial experience. The degree of reproducibility is sufficient to permit positive distinction between conditions of adhesiveness which differ considerably.
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