Frolenkov K.Y.,State UniversityEducationScienceProduction Complex |
Tsymai D.V.,State UniversityEducationScienceProduction Complex
Protection of Metals and Physical Chemistry of Surfaces | Year: 2015
We have designed a procedure for calculating strength criterion Kn as a parameter determining the mean strength of structure of silicate glasses and melts. The infrared spectra of silicate glasses used as coatings to protect low-alloy and low-carbon steels against high-temperature gas-phase corrosion in process heating are studied. Aluminum cations in the glasses under study are four-coordinate, while boron ions may be both fourand three-coordinated. The latter fact has a significant effect on the Kn values. The Kn values are calculated at operating temperatures of the studied glassy coatings. The correlation ratio between protective effect Δg of the glassy coatings and their Kn is analyzed. For glassy coatings with an operating temperature that lies within their vitrification range, there exists a nonlinear correlation between Δg and Kn; the correlation ratio between these parameters increases with temperature. Regression equations (significance level p = 0.05) describing the relationship between Δg and Kn are obtained for temperatures of 900 and 1000°C. © 2015, Pleiades Publishing, Ltd.