电沉积工艺参数及热处理对Fe-5Zn合金微观组织的影响

发布时间：2018-05-02 07:37

  本文选题：生物材料 + Fe-Zn合金　； 参考：《中国表面工程》2017年06期

【摘要】：铁具有较高的力学性能和良好的生物相容性,是极具潜力的可降解血管支架材料,但难以在规定的治疗期内完成降解是其面临的主要问题。在前期工作中利用电沉积技术制备出Fe-5Zn合金。为进一步优化其显微组织,将阴极平均电流密度由3.0 A/dm~2降至1.0 A/dm~2,控制电解液pH值在2.3左右,电沉积制备出成分均匀、组织细小致密,且具有(112)择优取向的Fe-5Zn单相固溶体合金。该合金经800℃氩气保护再结晶退火后,显微硬度由681 HV_(0.1)降至287 HV_(0.1),材料韧性得到改善。同时合金中有耐蚀性较高的铁、锌氧化物相析出,增加了微阴极数量。动电位极化曲线测量和模拟体液静态浸泡试验结果显示,热处理后的Fe-5Zn合金自腐蚀电位为-0.89 V,自腐蚀电流密度为1.77×10~(-6) A·cm~(-2),腐蚀速度则为0.259 mg·cm~(-2)·d~(-1),降解性能优于常规纯铁。
[Abstract]:Iron has high mechanical properties and good biocompatibility. It is a potential biodegradable stent material, but it is difficult to complete degradation within the prescribed treatment period. The Fe-5Zn alloy was prepared by electrodeposition in the previous work. In order to further optimize the microstructure, the average current density of the cathode was reduced from 3.0 A/dm~2 to 1.0 A / dmm2, and the pH value of the electrolyte was controlled around 2.3. The single phase Fe-5Zn solid solution alloy with uniform composition, fine and compact microstructure and preferred orientation was prepared by electrodeposition. After recrystallization annealing at 800 鈩，

本文编号：1832941