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

ABSTRACT

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

АННОТАЦИЯ

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

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

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

Zinc alloys with aluminum are very widely used in industry as anodizing coatings for the protection of steel parts [1–3]

Thermogravimetrical methods for studying the process of oxidation of metal

alloys were carried out in the solid state according to the described method [4–6]. Oxidation of alloys of a certain size is carried out with atmospheric oxygen in shaft furnaces [8–10]. The kinetic and energy parameters of the oxidation process were determined from the change in the mass of the sample with time [11–15]. The rate of the oxidation process of alloys is determined by the tangents drawn to several points of the oxidation curves [16–18]. The effective activation energy of the alloys was calculated from the slope of the lgK-1/T dependence [19–28].

The oxidation of the Zn22Al alloy modified with erbium was studied by the thermogravimetrical method [29–31] at 473K, 523K, and 623K. From the curves of the oxidation process for this alloy, it can be seen that with increasing temperature, the oxidation rate increases. At the initial stages of the oxidation process of the Zn22Al alloy, an oxide film is formed, which, apparently, does not have sufficient protective properties, as evidenced by an increase in the oxidation rate. When erbium is added, the curves become constant, that is, a thick protective oxide film is formed on the surface of the alloys. An alloy containing 0.01 wt.% erbium is characterized by a lower oxidizability compared to the original alloy (Figure 1).

It can be seen that with an increase in the concentration of erbium in the alloy, the rate of its oxidation increases, both with a 10-minute exposure of the alloys and with a 20-minute exposure in an oxidizing atmosphere (Figure 1). This is evidenced by a decrease in the effective activation energy with an increase in the scandium concentration in the alloy. This pattern is most clearly manifested at 523K (Table 1).

Figure 1. Kinetic curves of oxidation alloy Zn22Al-0.01Er at Т = 473 (1), 523 (2) and 623 К (3)

As the temperature increases, the rate of oxidation of the alloy increases. The reverse pattern is observed with an increase in the concentration of the modified component - erbium up to 1.0 wt%. An increase in the oxidation rate is accompanied by a decrease in the effective activation energy (table 1). The decrease in the rate of oxidation of alloys modified with erbium is associated with the formation of oxide films of a complex composition with good protective characteristics on their surface.

Table 1.

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

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