Surface Segregation of Components in Sn–Pb Solid Alloys

The surface segregation of components in Sn–Pb solid alloys was studied by Auger electron spectroscopy. The amplitudes of the Sn and Pb Auger peaks in the spectra of the solid alloys were measured. The surface content of lead at different volume concentrations and temperatures was calculated based on the obtained experimental data, which made it possible to study lead segregation caused by changes in the given parameters. The surface activity of tin was established in the solid β-solutions, and significant segregation of lead, in the α-solutions. Thus, for solid solutions with 0.12 and 0.22 at % Pb, the surface concentration of Pb is more than 100 times higher than its bulk content.