Effect of Different Carbon Additives on Hydrogen Storage Properties of AZ31 Magnesium Alloy by High Energy Ball Milling and Equal Channel Angular Pressing

[摘要] This study investigated the effect of carbon additives on the hydrogen storage performance of AZ31 Magnesium alloy. Different weight percentages (0 wt.%, 3 wt.%,) of activated carbon (AC), carbon black (CB)and graphene (G) were used as catalyst to explore the effect of different carbon material additives on the hydrogen storage performance. In addition, the effect of employing different processes like High energy ball milling and Equal channel angular pressing on hydrogen storage performance was also examined. AZ31 magnesium-based composites with different carbon materials were prepared through stir casting method. Micrographs were recorded through OM (optical microscope) and SEM (scanning electron microscope with EDS). The average particle size of the prepared powder samples was measured using particle analyzer. The hydrogenation kinetics was measured using Sievert's type apparatus. It was found that the addition of carbon materials and refined microstructures effectively enhanced the hydrogen storage performance of AZ31 Mg-alloy. In High energy ball millingprocess AZ31-3G (graphene) reaches the maximum storing capacity of 6.83±0.04 wt.% within 792±144.34 seconds and desorbed the entire hydrogen in 143 seconds. And in the case of ECAP process, the alloy AZ31-3CB (carbon black) reaches the hydrogen storage capacity of 6.72±0.05 wt.%.

[发布机构] Department of Mechanical Engineering, National Taiwan University of Science and Technology, No. 43, Sec. 4, Keelung Rd., Taipei, Taiwan^1

[效力级别] 生态环境科学 [学科分类] 环境科学（综合）

[关键词] Average particle size;AZ31 magnesium alloy;High-energy ball milling;Hydrogen storage capacities;Hydrogen storage properties;Hydrogenation kinetics;Refined microstructure;Stir casting method