Browsing by Author "Karakaya, I."

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Citation - WoS: 23
Citation - Scopus: 26
Effect of Electrodeposition Parameters on the Current Density of Hydrogen Evolution Reaction in Ni and Ni-mos₂ Composite Coatings
(Esg, 2013) Gueler, E. Saraloglu; Konca, E.; Karakaya, I.; Metallurgical and Materials Engineering; Metallurgical and Materials Engineering; 06. School Of Engineering; 01. Atılım University
Nickel composites with co-deposited insoluble, solid lubricant particles such as MoS2 have been reported to reduce friction. It is known that hydrogen evolution reaction (HER), competes with nickel deposition. The influence of the parameters and their interaction effects on the peak current density of HER during the electrodeposition of Ni and Ni-MoS2 composite coatings were studied by fractional factorial design. The parameters and their ranges studied were; MoS2 particle concentration (0-30 g/l), temperature (30-50 degrees C), pH (2-4) and two surfactants, namely; ammoniumlignosulfonate (ALS) and depramin-C (DC) (0-1 g/l). Electrodeposition processes were carried out from a typical Watts bath containing leveler, wetting agent and brightener by using a potentiostat. The peak current densities (i(p)) were extended to higher values and the peaks on linear sweep voltammograms became noticeable by increasing the scan rate from 20 mV/s to 100 mV/s over the range of 0 to 2.5 V. The peak current densities (i(p)) of HER for each experimental route were determined by fractional factorial design for two mineral processing surfactants; ammoniumlignosulfonate (ALS) and depramin-C (DC) using a statistical analysis software named Minitab [1]. Adding MoS2, decreasing temperature and increasing pH had decreasing effects on the peak current density of HER regardless of the surfactant used. On the other hand, the surfactants increased the peak current density.
Citation - WoS: 2
Citation - Scopus: 2
Investigation, Modeling and Design of a Cathodic Protection System for Hull Structures in Marine Environment
(Electrochemical Soc inc, 2016) Aksu, R.; Uguz, R. O.; Erdogan, M.; Meco, H.; Karakaya, I.; Department of Metallurgical and Materials Engineering; 15. Graduate School of Natural and Applied Sciences; 01. Atılım University
The corrosion behaviors of metallic components from hull structures of an amphibious vehicle in seawater were investigated. Selected steel types and aluminum alloys were subjected to accelerated corrosion tests in artificial seawater to collect data for simulation of cathodic protection with sacrificial anodes. The electrochemical data obtained via potentiostatic tests were used to simulate cathodic protection of the metallic components under seawater. Potential distributions in marine environment were evaluated to design the cathodic protection system that could impress the currents. Random paint deficient areas on a steel and aluminum components were created to test the protection performance of sacrificial anodes on the damaged surfaces.