Kinetics of Oxidation of Lithium-Modified Lead–Antimony Alloy SSu3 in the Solid State

The oxidation of the lead alloy SSu3 with lithium in air under isothermal conditions was studied by thermogravimetry while continuously recording the sample mass for 1 h at temperatures of 473, 523, and 573 K. Kinetic curves of oxidation of the SSu3 alloy with lithium were constructed based on the experimental data. The dependences of the specific weight increment on the amount of the alloying additive and temperature were determined from the curves. A lithium addition of up to 1.0 wt % increases the rate of oxidation of the lead alloy, which is accompanied by a decrease in the apparent activation energy of oxidation. Quadratic kinetic curves of alloy oxidation were constructed. The mechanism of oxidation of alloys was established. The oxidation of alloys in the given temperature range of 473–573 K obeys the hyperbolic law \(y = k{{x}^{n}}\) , where n = 1–4.