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Materials 2019, 12(2), 248;

The Effects of Silica on the Properties of Vitreous Enamels

Roesch Inc., 100 North 24th Street, Belleville, IL 62226, USA
Department of Materials Science & Engineering, Missouri University of Science and Technology, Rolla, MO 65409-0340, USA
Department of Civil, Architectural, and Environmental Engineering, Missouri University of Science and Technology, Rolla, MO 65409-0030, USA
Ruđer Bošković Institute, Division of Materials Chemistry, Bijenička c. 54, 10000 Zagreb, Croatia
Author to whom correspondence should be addressed.
Received: 5 December 2018 / Revised: 29 December 2018 / Accepted: 3 January 2019 / Published: 13 January 2019
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Ground coat enamels for low carbon steel that contain silica as a mill addition have been developed to study the changes of their properties. Acid-resistant commercial enamel where silica addition was varied from 0 to 10.0 wt % was used for this investigation. The effects of the addition on the corrosion resistance, thermal properties, electrical properties, and mechanical adherence of the enamel to low carbon steel were studied. The corrosion resistance of the steel enameled coupons was tested using a salt spray (fog) apparatus for time periods reaching 168 h at room temperature. It was found that, although the density was not affected, the adherence decreased with an increase in silica content. As expected, the silica addition decreased the coefficient of thermal expansion, which is directly related to the increasing stress between the glass and steel in accordance with the adherence results. A mill addition of 7.5 wt% of silica to the samples was sufficient to obtain adequate enamel adherence and good corrosion resistance. Furthermore, the addition of silica influenced the electrical conductivity and dielectric permittivity measurements at room temperature and the conductivity measured in a wide frequency range (1 Hz–1 MHz). The dielectric permittivity measured at 1 MHz showed decrease after the addition of up to 7.5 wt% of silica. View Full-Text
Keywords: glass enamel; acid resistant; silica; Raman spectroscopy glass enamel; acid resistant; silica; Raman spectroscopy

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Reis, S.T.; Koenigstein, M.; Fan, L.; Chen, G.; Pavić, L.; Moguš-Milanković, A. The Effects of Silica on the Properties of Vitreous Enamels. Materials 2019, 12, 248.

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