Effect of aging time on microstructure and properties of Zn-5.5Mg-0.4Ba-0.7Gd alloy

doi:10.13251/j.issn.0254-6051.2022.12.013

Abstract

Abstract: Zn-5.5Mg-0.4Ba-0.7Gd alloy prepared by vacuum melting was aged at 150 ℃ for 2, 4 and 8 h respectively. The effect of aging time on microstructure and properties of the alloy was studied. The results show that aging can improve microstructure of the alloy. At the beginning of aging, MgZn₂ phase in the alloy gradually transforms into Mg₂Zn₁₁ phase. The electrochemical test results show that the alloy aged for 4 h has the best corrosion resistance, the self corrosion potential is -942.844 mV, and the self corrosion current density is 13.34 μA/cm², the micropore resistance is 1894 Ω·cm², and the charge transfer resistance is 1613 Ω·cm². The corrosion products of the alloy aged for 4 h are mainly composed of zinc phosphate (calcium), zinc carbonate (calcium) and zinc hydroxide with excellent biocompatibility.

Key words: Zn-5.5Mg-0.4Ba-0.7Gd alloy, aging time, electrochemical properties, biocompatibility

CLC Number:

TG146.2

Liu Jingfu, Yin Kang, Lu Chaochao, Zhang Weibin. Effect of aging time on microstructure and properties of Zn-5.5Mg-0.4Ba-0.7Gd alloy[J]. Heat Treatment of Metals, 2022, 47(12): 78-83.

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