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.

摘要

这项工作的目的是比较和评估 1050、6013 和 7075 系列商用铝加工切屑和从切屑机械铣削获得的粉末的氢生成性能。在机械研磨之前，将 20 wt.% NaCl 添加到铝屑中以活化铝。NaCl 盐还用作过程控制剂，并防止在球磨施加的剧烈塑性变形过程中铝颗粒的过度冷焊。通过扫描电子显微镜分析芯片和粉末的形态。通过使用蒸馏水和 1 M NaOH 溶液在 70°C 进行氢生成实验。还在 30-70°C 的范围内研究了温度对铝合金制氢性能的影响。与芯片相比，机械研磨的粉末产生更高的氢气产率。通过机械研磨进行的剧烈冷加工加速了粉末的腐蚀并提高了产氢性能。研磨粉末在 NaOH 溶液中的产氢效率大约是研磨粉末在蒸馏水中的 3.5-7 倍。铝合金的氢产率随着合金含量的增加而增加，最高值是从 Al 7075 粉末在 NaOH 溶液中获得的。还证实了氢气产率随着反应温度的升高而增加。比蒸馏水中研磨的粉末高 5-7 倍。铝合金的氢产率随着合金含量的增加而增加，最高值是从 Al 7075 粉末在 NaOH 溶液中获得的。还证实了氢气产率随着反应温度的升高而增加。比蒸馏水中研磨的粉末高 5-7 倍。铝合金的氢产率随着合金含量的增加而增加，最高值是从 Al 7075 粉末在 NaOH 溶液中获得的。还证实了氢气产率随着反应温度的升高而增加。