Oxidation of Powdered Aluminum after Surface Modification with Mn, Fe, Co, and Ni Formates

Resumo

The effect of small additives of manganese, iron, cobalt, and nickel oxides on the oxidation of aluminum powder of ASD-4 grade while heating in air is studied. Composites of Al/MOx were prepared by impregnating the metal powder with saturated solutions of M(HCOO)₂ ⋅ 2H₂O (M = Mn, Fe, Co, and Ni) formates and thermal treatment of the mixtures in air with a maximum annealing temperature of 375°C. It has been established that the effect of modifiers on the intensity of oxidation depends on the nature of the interfacial interaction on the surface of particles. The formation of a liquid phase in the interaction of aluminum oxides and iron leads to the loss of the protective properties by the barrier layer of oxidation products and acceleration of the process.