Research Progress on Mechanical and Corrosion Properties of Zn-Cu-Ti Alloys
SUN Lili1,2, CHEN Liangyuan1,2, WANG Yong1,2, ZHANG Xuyun1,2, XU Dekui3
1 School of Mechanical Science and Engineering, Northeast Petroleum University, Daqing 163318, China; 2 Heilongjiang Key Laboratory of Petroleum and Petrochemical Multiphase Treatment and Pollution Prevention, Daqing 163318, China; 3 Oil Production Engineering Research Institute of Daqing Oilfield Company Limited, Daqing 163453, China
Abstract: Zn-Cu-Ti alloys are zinc-based alloys with a very broad application prospect. The addition of Cu and Ti elements to the zinc matrix can effectively improve the hardness and creep resistance of the materials. The good comprehensive mechanical properties of the Zn-Cu-Ti alloys are comparable to those of copper alloys, but also exhibit lower density. The Zn-Cu-Ti alloys can inherit the excellent corrosion resistance of zinc, and already have replaced the traditional galvanized sheets. The roof covering materials of Zn-Cu-Ti alloys can be extended by several times in the atmospheric environment. China's zinc reserves and production are both in the top positions in the world. However, Zn-Cu-Ti alloys have a very low proportion in the application of zinc. Firstly, most of Zn-Cu-Ti alloys are processed into coiled sheets for building wall panels and roofing materials, the application fields are limited. There are many deficiencies in the processing of domestic Zn-Cu-Ti alloys, however, the high-quality coils always need to be imported. Secondly, Zn-Cu-Ti alloys have excellent corrosion resistance in natural atmospheric environment, but the study of corrosion mechanism in special corrosion environment is unclear. In addition, the mechanical properties of Zn-Cu-Ti alloys are poor in high temperature and low temperature environments, and the research on the mechanical properties of Zn-Cu-Ti alloys has not yet reached a unified conclusion. These limit the application of the Zn-Cu-Ti alloys in other fields. In recent years, the modification technology of zinc alloys has actively been explored. The newly developed die-casting parts of zinc alloys are precise and complex in shape, which used to make bearings, molds, wear-resistant and shock-absorbing parts. Now it has been confirmed that the machining and heat treatments process will change the size and distribution of the compound phase, the solid solubility of metal ions in Zn-Cu-Ti alloys. When selecting the reasonable process parameters, the mechanical and corrosion resistance of the alloys will be improved to a certain extent. The increasing the content of Cu can increase the hardness and tensile strength of the alloys. Ti can improve the toughness of the zinc alloys. The addition of Cr, Mg and rare earth elements will change the phase composition and grain size of the alloys. The corrosion layer structure and the mechanical property of the alloys can be improved under certain conditions. During the period of the experiments, the experimental designs include changing the proportion of alloys composition, adding other metal elements, improving the preparation process, and heat treatments process. The corrosion testing mainly include the self-corrosion, electrochemical corrosion and stress corrosion cracking tests of the alloys under different environments. In addition to the measurements of microstructure and phase composition, the analytical methods also include the analysis of corrosion resistance of alloys by the density of corrosion layer and the establishment of mathematical model. Zn-Cu-Ti alloys will also become high-quality alternative materials for electrical materials, hardware materials, automotive parts and coating materials. In future, the proportion of Zn-Cu-Ti alloys in the consumption structure of zinc will gradually increase. Based on the characteristics of Zn-Cu-Ti alloys, this paper describes the research progress of mechanical properties and corrosion resistance of Zn-Cu-Ti alloys at home and abroad, and also summarizes the basic theoretical research results of the preparation process, molding process and corrosion of Zn-Cu-Ti alloys. Combined with the application prospect of Zn-Cu-Ti alloys, the application value of Zn-Cu-Ti alloys is expected to be more widely. The research in this paper provides a necessary reference for the development and application of Zn-Cu-Ti alloys.
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