Abstract
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.
Highlights
Enamels are deposited onto metallic surfaces to improve their corrosion resistance [1]
Along with with aa wide wide halo, halo, characteristic characteristic for for the the amorphous amorphous state, state, diffraction diffraction lines lines of of the the measurement results obtained on the glass enamel surfacewith for the all samples are shown crystalline phase—probably due to a reaction milling balls—were
The results indicate that the the enamel coating to the low carbon steel substrate decreased with the silica addition
Summary
Enamels are deposited onto metallic surfaces to improve their corrosion resistance [1]. The enamel produces a vitreous coating on the metal articles that protects the metal from the effect of liquids, gaseous, and solid reactants [2]. The extensive range of vitreous enamel compositions available and the possibility of tailoring their protective properties make them suitable for use in a wide variety of service conditions and on different substrates [3]. The new formulation of enamel coatings should improve properties such as strength, gloss, surface smoothness, acid protection, etc. Corrosion or chemical resistance in service is a major consideration for the final customers and should lead to a proper formulation of the enamel frit. In acid media, where the reaction rate of the ion exchange process predominates, the dissolution processes strongly depends on the composition of the coating [4]
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