ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 38, (1) 4 - 8 (1994)

Beneš Viktor 1, Bouše Václav 2, Slámová Margarita 3, Suchánek Vladimír 3, Voleník Karel 4
1 Czech technical University, Faculty of Engineering, Department of Mathematic, Karlovo náměstí 13, 121 35 Prague, Czech Republic
2 Smalt Ltd., 267 65 Komárov u Hořovic, Czech Republic
3 Research Institute for Metals, Panenské Břežany., 250 70 Odolena Voda, Czech Republic
4 National Research Institute for the Protection of Materials, 190 11 Praha -Běchovice, Czech Republic

Keywords: Enamels, Bubble structure, Gas evolution, Size distribution, Stereological method, X ray defectoscopic method

The bubble structure of enamel coatings affects their behaviour in corrosion environments and their applicability in the protection of metals against corrosion. A method enabling to characterize the bubble structure of enamel coatings was developed. After preparing a planar section parallel to the coating surface, the diameters of bubble sections are measured, preferably by image analysis. The resulting size distribution of two-dimensional bubble sections can be converted in the size distribution of three-dimensional bubbles using a stereological method. Examples of two different enamel coatings on steel substrate show the applicability of this method to real enamel systems.

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