Abstract
A technique is described for making angular cross sections of enameled steel in order to study the bubble structure of a porcelain enamel. This technique involves cutting a section so that the width of the glass layer is extended, allowing easier observation of bubble size and distribution. Plates of low‐carbon steel 1/8 in. thick were enameled and then made to fish‐scale by cathodic pickling, thus giving a measure of the fish‐scale resistance. The relative cross‐sectional area and the relative volume of the bubbles were calculated from photomicrographs of polished sections of the test plates and were correlated statistically with their fish‐scale resistance. Results indicate that the bubbles which were effective in inhibiting fish‐scaling were contained approximately in the 1‐mil layer of glass adjacent to the steel.
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