可降解铸态Zn-Cu-Sr 合金的组织与性能

In order to balance the mechanical properties and degradation rate of zinc-based alloys, the Zn-xCu-ySr(x = 2, 3, 5;y = 0. 1, 0. 3)ternary alloy was designed and cast, and the effects of different Cu and Sr contents on the microstructure and properties of as-cast Zn-Cu-Sr alloy were investigated. The results showed that the microstructure of Zn-xCu-ySr alloy consisted of zinc matrix, ε-CuZn₅ and SrZn₁₃ intermetallic compounds. When the contents of Cu and Sr were 5. 0wt% and 0. 3wt%, the tensile strength and hardness of zinc-based alloy reached the highest, which were 165. 3 MPa and 85. 5HB, respectively. The corrosion mode of Zn-xCu-ySr alloy was uniform corrosion. When the contents of Cu and Sr were 2. 0wt% and 0. 1wt%, respectively, the corrosion resistance of Zn-2Cu-0. 1Sr was the best, the corrosion rate in static immersion test was the slowest, which was about 0. 044 mm / a. And the corrosion current density and corrosion rate in potentiodynamic polarization test(PDP) were the smallest, which were 15. 10 μA / cm² and 0. 078 mm / a, separately.