Effect of barium additions on the thermophysical and thermodynamic properties of zinc alloy TsAMSv4-1-2,5

Abstract

Application of zinc and zinc alloys as structural materials is due to their corrosion resistance properties. Zinc alloys are highly resistant to corrosion in air and in marine conditions, in low-density alkaline and acidic solutions, and they have good cutability. Heat capacity is one of the essential characteristics of zinc alloys. Heat capacity and its temperature dependence play a major role in alloy studies. The available literature does not provide any information about how the addition of barium changes the heat capacity of zinc alloy TsAMSv4-1-2,5. A study was conducted to understand the temperature dependence of the thermophysical properties and thermodynamic functions of the zinc alloy TsAMSv4-1-2,5 with barium. For this, cooling curves of the reference and studied samples were compared in the cooling mode in the temperature range of 300–500 К using a copper reference sample (A5N grade of Al). This heat capacity measurement technique is based on the Newton-Richman cooling law. It is demonstrated that the heat capacity, enthalpy and entropy of the zinc alloy tend to decrease with the addition of barium, whereas the Gibbs energy of the alloys increases. Heat intensifies the thermophysical and thermodynamic properties of the alloys. The information about the obtained thermophysical and thermodynamic parameters of the zinc alloy TsAMSv4-1-2,5 with barium adds to the corresponding thermophysics reference books and it can also be used when designing parts and machines from the above mentioned alloys.