【摘要】 经过30 min表面机械研磨处理后,在TNZF合金表面成功制备了表层纳米结构,并讨论了表面纳米化对TNZF合金耐腐蚀性能的影响。纳米晶形成机理主要是通过大量位错滑移并相互切割基体,以及晶格转动实现晶粒细化。在人体生理盐水(0.9%NaCl)中测试的交流阻抗谱表明,纳米晶表面与粗晶表面相比低频阻抗值有很大提高;动电位极化曲线表明,表面纳米化提高了钛合金的腐蚀电位,同时降低了腐蚀电流密度,从而提高其抗氯离子的腐蚀性能。更多还原

【Abstract】 A nanostructured surface layer was prepared on a biomedical TNZF alloy by surface mechanical attrition treatment(SMAT) for 30 min, and the effects of surface nanocrystallization on the corrosion resistance of TNZF alloy were studied. The surface nanocrystallization mechanism ascribes to a large amount of dislocation slips which can segment the grain and the crystalline refinement by the grain rotation. The electrochemical impedance spectroscopy tests in 0.9%NaCl solution show that the impedance of surface nanostructured alloy increases, compared with the coarse crystalline. The potentiodynamic polarization curves illustrate that the corrosion potential of this kind of Ti alloy by SMAT is higher than that with coarse crystalline and at the same time, the corrosion current becomes lower, and thus the corrosion resistance of the alloy to Cl- is highly improved by surface nanocrystallization.更多还原