MECHANICS OF ENAMEL ADHERENCE, II

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Abstract
The effect on adherence of the variation in the amount of cobalt oxide, nickel oxide, and manganese oxide, and the effect of atmosphere, air, oxygen, and nitrogen on ad‐ herence were studied. Enamels of same base but with varying amounts of the special oxides were made up, fired in the various atmospheres, and tested for adherence by drop‐ hammer impact methods and by flexure methods. A number of photographs of metallographic sections showing contact line between enamel and metal are given. General conclusions are (1) that adherence is not a function of the roughness of contact line, (2) that the adherence promoting effect of cobalt oxide is higher at 1.25% than at 2.5% or 5.0%, and (3) that the effect of oxygen and nitrogen in general is to decrease the adherence as measured by impact strength.

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