https://orcid.org/0000-0003-0278-0373
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ABSTRACT
The objective of this work is to compare and evaluate hydrogen generation performance of 1050, 6013, and 7075 series commercial aluminum machining chips and powders obtained from mechanical milling of the chips. Prior to mechanical milling 20 wt.% NaCl was added to aluminum chips to activate aluminum. NaCl salt also functioned as a process control agent and prevented excessive cold welding of aluminum particles during intense plastic deformation applied by ball milling. Morphology of chips and powders was analyzed by scanning electron microscopy. Hydrogen generation experiments were performed by using distilled water and 1 M NaOH solution at 70°C. The effect of temperature on the hydrogen production performance of aluminum alloys was also investigated in the range of 30–70°C. Mechanically milled powders gave higher hydrogen generation yield compared to the chips. Severe cold working by mechanical milling accelerated the corrosion and increased the hydrogen production performance of the powders. Hydrogen production efficiency of milled powders in NaOH solution was approximately 3.5–7 times higher than milled powders in distilled water. Hydrogen yield of aluminum alloys increased with increasing alloy content and the highest values were obtained from Al 7075 powders in NaOH solution. It was also verified that the hydrogen yield increases with increasing reaction temperature.
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Notes on contributors
Sevim Yolcular
Sevim Yolcular works in the Chemical engineering Department of Ege University, Izmir, Turkey. She is working on chemical reaction engineering, energy, materials science and hydrogen storage subjects.
Serdar Karaoglu
Serdar Karaoglu works in the Mechanical Engineering Department of Ege University, Izmir, Turkey. His research interests are generally related to the material science aspect of manufacturing techniques. Recently he has been working on the mechanical alloying and milling processes of powder metallurgy.
Mutlu Karasoglu
Mutlu Karasoglu works in the Mechanical Engineering Department of Eskisehir Technical University, Eskisehir, Turkey. His main research subjects are metal matrix composites, powder metallurgy and additive manufacturing.