KINETICS OF INTERACTION OF HARD ALLOYS Zn22Al-Tl SYSTEM WITH OXYGEN IN THE GAS PHASE

ABSTRACT

The article presents the results of a thermogravimetrical research of the kinetics of the interaction of Zn22Al hard alloy containing thallium with gas phase oxygen.

АННОТАЦИЯ

В статье приведены результаты термогравиметрического исследования кинетики взаимодействия твердого сплава Zn22Al, содержащего таллия с кислородом газовой фазы.

Keywords: Zn22Al alloy, thallium, thermogravimetrical method, activation energy, alloys oxidation.

Ключевые слова: сплав Zn22Al, таллий, термогравиметрический метод, энергия активации, окисление сплавов.

During the development of industrial production [1–3], the introduction of new technologies and the increasing requirements for durability and reliability of corrosion-resistant and structural materials [4–10], it is necessary to pay special attention to the application and optimization of alloy production processes [11–14]. In connection with the expansion of the areas of application of zinc and aluminum and its alloys [15–20], previously little-studied alloying metals are involved in the practice of synthesizing new materials [24–26], which include rare earth metals, which have a number of unique properties [27–31].  

The process of oxidation of the Zn22Al alloy containing 1.0% thallium proceeds intensively at the initial stage due to the absence of an oxide film at the reaction surface. This is evidenced by the calculated values of the oxidation rate, which are given in table 1.

Table 1.

Kinetic and energy parameters of the oxidation system Zn22Al-Tl alloys

With the introduction of 0.1% thallium in the Zn22Al alloy, that is, as a result of the formation of an oxide film, the further course of the process slows down, since the reaction area decreases. In this case, apparently, the formed film is sufficiently dense and excludes the access of oxygen (Table 1).

The process of oxide formation at the surface of alloys is complex and multifactorial. The rate of the process depends on the activity of the initial components, the products of their interaction, and external factors. The possibilities of the process and the formation of various oxidation products are determined by the thermodynamic characteristics of the components of the systems under consideration. The high values of the Gibbs energy, the enthalpy of formation, and the chemical potential of the oxides of these metals contribute to the proposed mechanism of the oxidation of these alloys.

From the slope of the straight line of the dependence of the oxidation rate of Zn22Al alloys with different thallium contents on the reciprocal temperature, their effective activation energy of oxidation was calculated, which is 151.2, 176.4, 177.6, 178.3, 174.5 and 171.8 kJ/mol. An increase in the thallium content above 0.5% promotes an increase in the oxidation rate of the Zn22Al alloy, which is accompanied by a decrease in the activation energy (Figure 1).

Figure 1. Isochronous of the oxidation (523 K) system Zn22Al-Tl alloys

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