Electron spectroscopy studies of the oxidation behaviour and the electronic properties of some MgIn and MgAl alloys

The electronic properties and surface characteristics of some MgIn and MgAl alloys were studied by electron spectroscopy techniques (Auger electron spectroscopy and X-ray photoelectron spectroscopy). It was found that the electrochemical interactions between magnesium and indium are stronger than those between magnesium and aluminium. It was further found that the surface oxidation behaviour of indium-containing alloys is different from that of aluminium-containing alloys. In the former case only the magnesium atoms are oxidized at the surface, leaving the indium atoms in their metallic state, while in the latter case both magnesium and aluminium are oxidized at the surface. Both types of alloy display oxidation-enhanced surface segregation of the magnesium atoms. The hydrogenation behaviour of the various magnesium-base alloys is discussed in the light of their surface properties.