表面纳米化对纯钛阳极氧化膜组织及特性的影响

Influence of Surface Nanocrystallization on Microstructure and Properties of Anodic Oxide Film on Pure Titanium

摘要:

通过表面机械研磨处理（SMAT）制备了表面梯度纳米晶结构，研究了表面纳米化对纯钛阳极氧化膜的表面组织及特性的影响。在30 V恒电位模式、0.5 mol/L H₂SO₄溶液中进行不同时长的阳极氧化处理。使用光学显微镜、X射线衍射、拉曼光谱、光电子能谱及电化学测试研究氧化膜的表面特性及腐蚀抗性。结果表明，梯度纳米晶结构可以增加氧化膜的厚度，促进结晶行为，提高抗腐蚀性。阴阳离子空位凝聚机制能够解释梯度纳米晶结构对抗腐蚀性的影响。

Abstract:

The surface gradient nanocrystalline structure was fabricated by the surface mechanical attrition treatment (SMAT), and the influence of surface nanocrystallization on the surface microstructure and characteristic of passive film on pure titanium was studied. The anodic oxidation was conducted in 0.5 mol/L H₂SO₄ solution under the potentiostatic mode at 30 V for different durations to investigate the surface characteristic and corrosion resistance of the passive films by optical microscope, X-ray diffraction, Raman spectrometer, X-ray photoelectron spectroscopy, and electrochemical test. The results show that the gradient nanocrystalline structure can increase the film thickness, promote the crystallization, and improve the corrosion resistance of passive film. The influence mechanism of surface nanocrystallization on the corrosion resistance can be explained by the cation-anion-vacancy condensation.