(1. 河南科技大學(xué)材料科學(xué)與工程學(xué)院，洛陽(yáng)471023；
2. 河南科技大學(xué)河南省有色金屬共性技術(shù)協(xié)同創(chuàng)新中心，洛陽(yáng) 471023)
摘 要: 采用掃描電鏡(SEM)、X射線衍射(XRD)、透射電鏡(TEM)研究稀土Y對(duì)Mg-2Nd-0.5Zn-0.4Zr生物鎂合金顯微組織的影響，通過(guò)析氫、質(zhì)量損失測(cè)試及電化學(xué)方法研究Mg-2Nd-0.5Zn-0.4Zr鎂合金在模擬體液(SBF)中的生物腐蝕性能。結(jié)果表明：稀土Y的添加使得鎂合金中析出相由連續(xù)分布變?yōu)閿嗬m(xù)狀，分布趨于均勻，出現(xiàn)新的片狀析出相Mg24Y5。稀土Y能使鎂合金的耐生物腐蝕性能得到提高。添加1%的Y時(shí)，鎂合金腐蝕速度最低為1.051mm/a，僅為基礎(chǔ)合金的40.81%。
關(guān)鍵字: 稀土Y；生物鎂合金；生物腐蝕性能；電化學(xué)性能
（1. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China;
2. Collaborative Innovation Center of Nonferrous Metals of Henan Province,
Henan University of Science and Technology, Luoyang 471023, China）
Abstract:Effects of rare earth Y on microstructure of Mg-2Nd-0.5Zn-0.4Zr magnesium alloys were investigated by scanning electronic microscopy (SEM), X-ray diffractometry (XRD) and transmissionelectronmicroscopy (TEM). The biocorrosion properties of the Mg alloys in the simulated body fluid (SBF) were evaluated by hydrogen evolution, mass loss experiments and electrochemical methods. The results show that the morphology of the precipitated phase changes from continuous network to discontinuous disperse, and grain size is refined after the addition of Y, a new blocky Mg24Y5 phase forms.Y addition improves the biocorrosion properties of the alloys. When the Y addition is 1%, the corrosive speed of the alloy is the lowest, which is 1.051 mm/a, only 40.81% of that of the initial alloy.
Key words: rare earthY; biomaterial magnesium alloy; biocorrosion property; electrochemical property
