Browsing by Author "Abd-Elaziz T.D."

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Corrosion study of glaze-ceramics doped cement-kiln-dust soaked in concentrated HCI
(2010) Essa F.A.; Abd-Elaziz T.D.; Zakariya M.R.; Ezz-Eldin F.M.; Chem. Dept; Faculty of Sci.; Menufya Univ.; Menufya; Egypt; MSA University (October Univ. for Modern Sciences and Arts); 6th October City; Egypt; Color Preparation Dept.; Ceramica-Marselia Factory; Egypt; National Center for Radiation Research and Technology; Cairo; Egypt
NEW glaze-ceramics formulated from industrial waste have been prepared. The method consists of introducing cement-kiln-dust (CKD) in the industrial glaze-ceramics with various ratios (10-50%) together with the addition of 10gm boric acid. The chemical durability of the prepared composite cement-dust-glaze-ceramics (CDGC) is investigated using high concentrations of (2,5 & 8N) HCI acid solutions. CDGC are vitrified by melting for four hours at 1400�C � 250�C depending on the amount of CKD introduced. Specifically, the experimental results indicate that the introduction of CKD in industrial glaze decreases durability. At high HCI concentrations, the durabilities of the prepared glaze-ceramics are observed to decrease with increasing the percentage of (CKD) until certain limit and almost constancy. The corrosion results are explained according to the ion exchange mechanism and formation or dissociation of the modified depleted layer. Some hollow and jogged areas are observed by SEM which might be interpreted as evidence of local corrosion phenomena. In addition, the pH values of the leachant solutions are measured. The comparison of hardness for the optimum glaze-ceramic and glaze-ceramic derivatives prepared in this study indicates a degradation % in their chemical and physical properties depending on the amount% of CKD introduced. It is observed that the degradation not only depends on the amount of CKD introduced, but also on the strength of the leaching HCI acid solution. Also, the results show that, the prepared glazes have a surface hardness values ranged from 5.5 to 2.5 in the Mohs scale.
Effect of dilute HF solutions on chemical, optical, and mechanical properties of soda-lime-silica glass
(2010) Ezz-Eldin F.M.; Abd-Elaziz T.D.; Elalaily N.A.; National Center for Radiation Research and Technology; P.O. Box 29; Nasr-City; Cairo 11765; Egypt; Faculty of Engineering; Industrial Chemistry Department; MSA University; 6th October City; Egypt
Commercially and laboratory prepared soda-lime-silica (SLS) glasses compositions were investigated for corrosion behavior toward varying dilute HF solutions. The corrosion is found to be low in 0.05 M HF solution and relatively high with 0.5 M HF. Infrared reflectance studies were measured to monitor the surface changes after etching process. The corrosion data are explained on the basis of selectivity of HF toward the bridging and nonbridging oxygens. Optical transmittance, impact toughness, and density were measured after corrosion; the data are used to verify the suggested corrosion mechanism. Significant changes were reached on the remeasurement of previous collective studied properties when the commercial glass was irradiated. � 2010 Springer Science+Business Media, LLC.
Effect of Iron Slag on the Corrosion Resistance of Soda Lime Silicate Glass
(Springer Netherlands, 2018) El-Alaily N.A.; Abd-Elaziz T.D.; Soliman L.; National Center for Radiation Research and Technology; Nasr City; Cairo; Egypt; October University for Modern Sciences and Arts (MSA); 6th October City; Cairo; Egypt
Soda lime silicate glasses containing different amounts of iron slag 30 % were prepared. The chemical durability of the prepared glasses was examined by immersion in HCl or HNO3 solutions at room temperature. The results show that the glass durability increases with increasing the amount of slag in the glass composition to a certain amount, then followed by a decrease in the glass durability. Various mechanisms of corrosion and the role of the mobility of cations and their leaching into solution, also the effect of time of leaching are discussed. The densities of all glass compositions were measured. The quantitative analysis obtained from infrared absorption spectra in the range of (400 4000) cm?1 in relation to the effect of corrosion on the absorption spectra has been studied in terms of structural concepts. The topography of the glass surfaces was observed by scanning electron microscopy (SEM). The concentration percentage of the ions present on the glass surface was determined by Energy Dispersive X-ray analysis (EDX). 2015, Springer Science+Business Media Dordrecht.
Influence of Industrial Solid Waste on the Chemical and Mechanical Properties of Traditional Glaze-Ceramics
(Springer Netherlands, 2018) Abd-Elaziz T.D.; Ezz-Eldin F.M.; October University for Modern Sciences and Arts (MSA); 6th October City; Egypt; National Center for Radiation Research and Technology; Atomic Energy Authority; Cairo; Egypt
New glaze compositions were synthesized from combinations of ceramic glaze and cement kiln dust. The products show very good chemical resistance to acid and alkaline corrosion, with no visual changes on the surfaces of the samples. This resistance can be attributed to the very well balanced composition of wastes and commercial ceramic glaze materials. Corrosion data reveal the results of mass loss either at 25 ? or 100 ?. The mass loss is very low, showing that it is possible to develop glazes with excellent chemical resistance to strong acid and alkaline solutions corrosion starting from different concentrations of cement kiln dust associated with commercial ceramic glaze materials. The IR spectra of the prepared samples show characteristic bands related to the vibrations of triangular and tetrahedral borate and tetrahedral silicate groups together with metal-oxide groups. The surface hardness data of the glazes determined by Mohs are found to be 5�6 at early immersion times up to ?9 days, but there is obvious deterioration beyond 9 days. The results point out that it possible to deepen the understanding of the mechanisms of elements released through the chemical attack and their implications on microstructural and mechanical degradation of the working surface of glazed ceramic tiles. � 2016, Springer Science+Business Media Dordrecht.