表面纳米化工业纯钛组织性能研究

发布时间：2018-06-06 10:40

本文选题：表面机械研磨处理(SMAT) + 微观组织　；参考：《稀有金属》2016年10期

【摘要】：采用表面机械研磨处理(SMAT)实现工业纯钛的表面纳米化,利用金相显微镜(OM)、显微硬度计对其微观组织及显微硬度进行表征、测定;利用动电位极化曲线和电化学阻抗谱(EIS),结合X射线光电子能谱分析(XPS)技术,研究了表面纳米化工业纯钛在Hank's人工模拟体液中的腐蚀行为。结果表明:SMAT处理工业纯钛表层晶粒尺寸达到纳米级,从表层到基体晶粒尺寸由小到大呈梯度分布,其表层显微硬度明显提高,并由表层逐步降低至基体硬度。SMAT处理工业纯钛的自腐蚀电位较原始工业纯钛正移,腐蚀电流密度较原始工业纯钛低,其EIS高频容抗弧半径较原始试样大,表现出更稳定的钝化现象。表面纳米化过程中产生的高密度晶界和位错为Ti~(4+)提供了更多的扩散通道,有助于表面产生稳定的保护钝化膜,提高其耐蚀性。XPS分析结果表明,SMAT处理工业纯钛钝化膜的主要成分为Ti O_2。
[Abstract]:The surface nanocrystalline of industrial pure titanium was realized by surface mechanical grinding treatment (SMATT). The microstructure and microhardness of titanium were characterized and measured by metallographic microscope and microhardness tester. By means of potentiodynamic polarization curve, electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS), the corrosion behavior of titanium in Hankos artificial simulated body fluid was studied. The results show that the grain size in the surface layer of commercial pure titanium treated by: SMAT reaches nanometer level, the grain size from the surface layer to the matrix is gradient distribution, and the microhardness of the surface layer is obviously improved. The corrosion potential of industrial pure titanium treated with SMAT matrix hardness was higher than that of the original pure titanium, and the corrosion current density was lower than that of the original commercial pure titanium, and its high frequency arc resistance radius of EIS was larger than that of the original sample. Show a more stable passivation phenomenon. The high density grain boundaries and dislocations produced in the process of surface nanocrystallization provide more diffusion channels for TiP4) and contribute to the formation of stable passive films on the surface. The results of XPS analysis show that the main component of the passivated film treated with SMAT is TIO _ 2.
【作者单位】：西安建筑科技大学冶金工程学院;
【基金】：国家自然科学基金项目(51274160) 西部材料创新基金二期(XBCL-2-09) 陕西省科技厅科技项目(2014JQ6211)资助
【分类号】：TG146.23

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