Experimental study of thermal oxidation of nanoscale alloys of aluminium and zinc (nAlZn)

Abstract

Aluminium-based alloys have wide applications but little is known about the thermalchemical kinetics of nanoalloys. This work investigated the thermal oxidation of Zn and Al nanoalloys (nAlZn) with a BET equivalent diameter of 141 nm through the simultaneous TGA/DSC method. The thermal analysis was combined with elemental, morphology and crystalline structure analysis to elucidate the reaction mechanisms. It was found that the complete oxidation of nAlZn in air can be characterised by a three-stage process, including two endothermic and three exothermic reactions. With the help of ex-situ XRD, different reaction pathways were proposed for different stages, forming the end products of ZnO and ZnAl 2 O 4 . The reactivity comparison between Al and nAlZn suggested that different criteria should be used for different applications.

The Effect of Nanosizing on the Oxidation of Partially Oxidized Copper Nanoparticles

“…Oxidation of metal nanostructures is one of the size/shape dependent phenomena which have been recently intensively studied. Thermoanalytical methods, namely thermosgravimetry (TG), differential thermal analysis (DTA) and differential scanning calorimetry (DSC), have been frequently used for an investigation of metal nanoparticles and other nanostructures oxidation, e.g., Al [8,9], AlCu [10], AlZn [11], Cu [12,13], Fe [14], Sn [15]. The as prepared metal nanoparticles can be spontaneously as well as intentionally oxidized, which affects the results of subsequent oxidation experiments.…”