Hydrogenation of anodized aluminum and crystal growth of formed hydride at high pressure and high temperature

齋藤 寛之; 加藤 誠一*; 片桐 昌彦*

Materials Transactions, 55(8), p.1114 - 1116, 2014/08

https://doi.org/10.2320/matertrans.MG201411

Anodized aluminum samples with different surface oxide layer thicknesses (approximately 0.3 and 3 m) were hydrogenated at 9 GPa and 600C for 24 h. A few large crystals of AlH, less than 50 m in particle size, were formed when the aluminum sample with the thicker oxide layer was hydrogenated, whereas the sample with the thinner oxide layer was uniformly hydrogenated to form AlH crystals less than 10 m in particle size. It is likely that the surface oxide layer inhibits not only the hydrogenation reaction of aluminum but also the spontaneous nucleation of AlH.