A Geometrical Model of a Glass
Enamel Coating. Part 1. Calculation of the Open Surface Fraction of Enameled Metal
N. T. Shardakov and V. Ya. Kudyakov
Institute of High-Temperature Electrochemistry, Ural Division, Russian Academy of Sciences,
ul. S. Kovalevskoi 20, Yekaterinburg, 620219 Russia
Received May 14, 2003
Abstract — A geometrical model of glass–enamel coating (GEC) is proposed. Gas bubbles are chosen as the basic elements of its macrostructure, and the fundamental principles of the model are formulated. A model equation correlating the fraction of the open metal surface with the dissolution depth of enamel and GEC parameters is derived. Partial equations are derived according to various laws of the bubble size distributionsuch as invariance of the size, equal probability of any size, and normal, or lognormal distribution of bubbles over the size. It is shown that the open surface fraction always increases with the concentration of bubbles and contact angle, whereas its dependence on the GEC thickness and the statistical characteristics of the totality of bubbles has a more complex character.