Browsing by Author "Eker, Y.R."

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Citation - WoS: 5
Citation - Scopus: 6
The Influence of Sodium Fluoride on the Dissolution Kinetics of Metallic Titanium in Citric Acid Solution Using the Rotating Disc Method
(Elsevier B.V., 2024) Motasim, M.; Aydoğan, S.; Agacayak, T.; Eker, Y.R.; El-gak, A.; Seifelnassr, A.A.S.
This study reports the effect of sodium fluoride on the dissolution kinetics of pure metallic titanium in a citric acid solution. The effects of sodium fluoride concentration, citric acid concentration, temperature, stirring speed, and disc surface area were examined. The dissolution rate of titanium increases strongly with increasing citric acid and sodium fluoride concentrations. Fluoride ions react with hydrogen ions to form hydrofluoric acid, which removes the passive layer of titanium dioxide. An increase in the concentration of NaF and acid causes the formation of a brown layer on the surface of titanium. X-ray diffraction and SEM-EDX analyses showed that the layer composition is mostly of titanium fluoride (TiF3) and titanium fluoride oxide (TiOF2). A mixed kinetic model with an activation energy of 26.4 kJ/mol can be used to explain the reaction kinetics. © 2024 Elsevier B.V.
Citation - WoS: 4
Citation - Scopus: 3
Ultrasonic Characterization of Polymer Based Sille Stone Powder Composite Mortars
(Turkish Chamber of Civil Engineers, 2024) Ari, A.C.; Tosun, M.; Oral, I.; Eker, Y.R.
The Sille stone mined in the Sille Region of Konya province in Turkiye, is an andesitic rock. This stone is a material used in the construction of traditional and modern buildings. The Sille stone is cut for use in buildings. The Sille stone powder (SSP) is formed during this cutting process. The SSPs cause environmental pollution. This study was carried out to produce durable and eco-friendly new restoration mortars from the SSP that can be used in the restoration of historical buildings. The SSP composites were prepared by contributing SSP into epoxy and polyester resins in varied ratios such as 60‒75 wt.%. The effect of resin types and SSP contribution ratios on the elastic properties of epoxy resin (ER)/SSP and polyester resin (PR)/SSP composites was investigated by the ultrasonic pulse-echo method. Additionally, the morphology of these composites was investigated by scanning electron microscopy (SEM). Experimental results indicated that both the longitudinal and shear wave velocity values of the PR/SSP composites were higher than those of the ER/SSP composites. Furthermore, a linear increase in the elastic properties of the obtained composites was observed with increasing amounts of SSP. © 2024, Turkish Chamber of Civil Engineers. All rights reserved.