Oxidation Kinetics of the Germanium-Alloyed
AK7M2 + 0.05% Sr Alloy

A. E. Berdiev^a,*, I. N. Ganiev^a,**, and S. S. Gulov^b,***

^aInstitute of Chemistry, Academy of Science of the Republic of Tajikistan,
ul. Aini 299/2, Dushanbe, 734063 Republic of Tajikistan

^bTajik Technical University, pr. Akademika Radzhabova 10a, Dushanbe, 734 042 Republic of Tajikistan

*e-mail: berdiev75@mail.ru

**e-mail: ganiev48@mail.ru

***e-mail: gulov72@mail.ru

Abstract—The oxidation kinetics of the germanium-alloyed AK7M2 + 0.05% Sr alloy in air at temperatures
of 773 K, 798 K, and 823 K is investigated by the thermogravimetric method. It is revealed that the addition of
germanium up to 0.6 wt % decreases the oxidation rate, as evidenced by an increase in the apparent activation
energy of oxidation from 14.7 to 79.8 kJ/mol, which drops again to 25.2 kJ/mol as the Ge content increases to
1.0 wt %. The true oxidation rate varies in limits of (4.30–6.00) 10^–4 kg/(m² s), depending on the amount of
alloying component. Silicon dioxide SiO₂ and germanium dioxide GeO₂ are also revealed in oxidation products
of alloys along with -Al₂O₃.

Keywords: AK7M2 alloy, strontium, germanium, thermogravimetric method, oxidation kinetics, temperature
dependence, oxidation rate, activation energy

DOI: 10.3103/S1067821214050046

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