生物医用Mg-Zn合金微管的显微组织和腐蚀性能
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摘要
研究了不同成分的镁锌合金微管的显微组织、在Hank's溶液中的耐蚀性以及电化学性能。结果表明:在相同工艺下制备出的镁合金微管显微组织发生完全再结晶,并且晶粒尺寸随着锌含量的提高而降低。锌含量低于5wt%时呈现接近单相的显微组织,而当锌含量达到6wt%时出现了第二相,形成沿加工方向排列的带状组织。随锌含量的上升,耐蚀性先提高随后下降,其中Mg-5Zn的腐蚀速率最低,仅为0.03mm/a,而Mg-6Zn腐蚀速率最高为1.76 mm/a。与此同时,Mg-5Zn具有最高的自腐蚀电位和最小的自腐蚀电流密度。锌元素在合金中固溶度高且显微组织接近单相的镁锌合金,对提高耐蚀性具有重要作用。
The microstructure, corrosion resistance in Hank's solution and electrochemical properties of Mg-Zn alloy micro tubes with different composition were studied. The results show that completely dynamic recrystallization appears in Mg-Zn alloy micro tubes prepared by the same tube-making process and the average grain size reduces with the increase of Zn content. The microstructure is near single-phase when the Zn content is below 5 wt%. The secondary phase particles appear as banded structure distributing along the processing direction when the Zn content is 6 wt%. With the increase of Zn content, the corrosion resistance increases and then decreases, the slowest corrosion rate of Mg-5 Zn alloy is 0.03 mm/a and the fastest corrosion rate of Mg-6 Zn alloy is 1.76 mm/a. Meanwhile, Mg-5 Zn alloy has the highest free corrosion potential and the smallest corrosion electrical current density. Increasing the solid solubility of Zn element in Mg-Zn alloy is high and its microstructure is closed to single-phase Mg-Zn alloy, which are critical to increase the corrosion resistance.
The microstructure, corrosion resistance in Hank's solution and electrochemical properties of Mg-Zn alloy micro tubes with different composition were studied. The results show that completely dynamic recrystallization appears in Mg-Zn alloy micro tubes prepared by the same tube-making process and the average grain size reduces with the increase of Zn content. The microstructure is near single-phase when the Zn content is below 5 wt%. The secondary phase particles appear as banded structure distributing along the processing direction when the Zn content is 6 wt%. With the increase of Zn content, the corrosion resistance increases and then decreases, the slowest corrosion rate of Mg-5 Zn alloy is 0.03 mm/a and the fastest corrosion rate of Mg-6 Zn alloy is 1.76 mm/a. Meanwhile, Mg-5 Zn alloy has the highest free corrosion potential and the smallest corrosion electrical current density. Increasing the solid solubility of Zn element in Mg-Zn alloy is high and its microstructure is closed to single-phase Mg-Zn alloy, which are critical to increase the corrosion resistance.
引文
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[11]Wu Guosong, Feng K.Effects of surface alloying on electrochemical corrosion behavior of oxygen-plasma-modified biomedical magnesium alloy[J].Surface&Coatings Technology,2012,42:3186-3195.
[12]Wang Guang. Effects of extrusion and heat treatment on the mechanical properties and biocorrosion behaviors of a Mg-Nd-Zn-Zr alloy[J].Materials Science,2012,12:74-78.
[13]Mao Lin, Yua G Y.In vitro degradation behavior and biocompatibility of Mg-Nd-Zn-Zr alloy by hydro fluoric acid treatment[J].Materials Science and Engineering,2013,74:242-250.
[14]耿丽彦. Zn含量对生物医用镁合金耐Hank,s模拟体液腐蚀的影响[J].材料科学,2015,51(11):1400-1406.
[15]朱世杰,关绍康.超细晶生物镁合金的制备及其耐腐蚀性能[J].中国骨科临床与基础研究杂志,2013(1):123-126.
[16]袁广银.镁钙锌合金在人体模拟体液中的腐蚀行为[J].材料导报,2016,24(2):598-608.
[17]毛丽贺.生物镁合金及其腐蚀性能[M].北京:科学出版社,2016.
[2]宗阳.可降解骨内植入材料用镁合金JDBM表面改性的研究[D].上海:上海交通大学,2011.
[3]张佳,袁广银,常建卫,等.新型医用Mg-Nd-Zn-Zr镁合金在模拟体液中的降解行为[J].中国有色金属学报,2010,20(10):1989-1997.
[4]丁文江,向亚贞,常建卫,等.Mg-Al系和Mg-RE系合金在Na Cl溶液中的腐蚀电化学行为[J].中国有色金属学报,2016,19(10):1713-1719.
[5]赵辉,雷民.新型可吸收镁合金支架在血管内应用及生物相容性[J].中国组织工程研究,2016(2):16-17.
[6]官星旻.可降解生物医用镁合金JDBM作为颌骨修复材料的应用研究[J].上海交通大学,2015(4):18-20.
[7]王灏.多孔结构互补支架体内异位成骨及钴铬合金生物功能化研究[J].西南交通大学,2015(4):47-48.
[8]Niu Jialin, Xiong Meiping.The in vivo degradation and bone-implant interface of Mg-Nd-Zn-Zr alloy screws:18 months post-operation results[J].Corrosion Science,2016,113:183-187.
[9]Yuan, Yuanming Ouyang. In vitro response of chondrocytes to a biodegradable Mg-Nd-Zn-Zr alloy[J].Materials Letters,2012,56:206-208.
[10]Niu Jialin,Yuan Guangyin. Enhanced biocorrosion resistance and biocompatibility of degradable Mg-Nd-Zn-Zr alloy by brushite coating[J].Materials Science and Engineering,2013,89:4833-4841.
[11]Wu Guosong, Feng K.Effects of surface alloying on electrochemical corrosion behavior of oxygen-plasma-modified biomedical magnesium alloy[J].Surface&Coatings Technology,2012,42:3186-3195.
[12]Wang Guang. Effects of extrusion and heat treatment on the mechanical properties and biocorrosion behaviors of a Mg-Nd-Zn-Zr alloy[J].Materials Science,2012,12:74-78.
[13]Mao Lin, Yua G Y.In vitro degradation behavior and biocompatibility of Mg-Nd-Zn-Zr alloy by hydro fluoric acid treatment[J].Materials Science and Engineering,2013,74:242-250.
[14]耿丽彦. Zn含量对生物医用镁合金耐Hank,s模拟体液腐蚀的影响[J].材料科学,2015,51(11):1400-1406.
[15]朱世杰,关绍康.超细晶生物镁合金的制备及其耐腐蚀性能[J].中国骨科临床与基础研究杂志,2013(1):123-126.
[16]袁广银.镁钙锌合金在人体模拟体液中的腐蚀行为[J].材料导报,2016,24(2):598-608.
[17]毛丽贺.生物镁合金及其腐蚀性能[M].北京:科学出版社,2016.