Hydrogen-induced change of oxidation combustion characteristics of Al2Mg alloy

The effects of solid-state hydrogen introduction on the oxidation combustion property and mechanism of Al2Mg alloy were investigated by means of thermal analysis, X-ray diffraction, scanning electron microscopy and energy dispersive spectrum. It was found that the starting combustion temperature of hydrogenated Al2Mg alloy is lowered by about 150 & DEG;C as compared with pristine Al2Mg alloy, due to its distinct phase composition of MgH2 + Al as well as loose, porous and refined particle characteristics. The first-stage oxidation for the Al2Mg alloy hydride can be ascribed to the dehydrogenation of MgH2 to form Mg followed by the reaction of Mg with oxygen to form MgO, which is entirely different from the oxidation mechanism of Al2Mg alloy. During the second-stage oxidation, MgAl2O4, gamma-Al2O3 and alpha-Al2O3 were formed for both Al2Mg alloy and its hydride. However, almost no AlN can be generated for the Al2Mg alloy hydride with respect to Al2Mg alloy.(c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

The effects of solid-state hydrogen introduction on the oxidation combustion property and mechanism of Al2Mg alloy were investigated. It was found that hydrogenation can lower the starting combustion temperature of Al2Mg alloy and change its oxidation mechanism. Various oxides such as MgAl2O4, γ-Al2O3, and α-Al2O3 were formed during the oxidation of hydrogenated Al2Mg alloy, while AlN was hardly generated.