基于Ti-5Al-1V-1Sn-1Zr-0.8Mo合金的分段电压微弧氧化膜层的研究（英文）

Study on Micro Arc Oxidation Coating Based on Ti-5Al-1V-1Sn-1Zr-0.8Mo Alloy with Applied Voltage in Stages

主要研究分段电压对于钛合金表面所制备的微弧氧化膜层特性的影响。利用扫描电子显微镜(SEM)和激光扫描共聚焦显微镜对MAO膜层的结构进行了表征,利用能谱分析(EDS)和X射线衍射(XRD)对膜层成分进行分析。对比评价了不同分段电压模式下膜层的厚度、粗糙度和耐蚀性。结果表明,第1阶段电压为320 V氧化时间180 s与第2阶段电压为420 V氧化时间为720 s相比,所形成的膜层粗糙度最小。第1阶段外加电压320 V氧化时间120 s与第2阶段外加电压420 V氧化时间780 s相比,膜层最为致密,耐腐蚀性最好。XRD结果表明,膜层是由TiO2和亚稳态Ti2O3组成。

The aim of this work is to study how applied voltage in stages incorporates into the prepared micro arc oxidation(MAO) coatings on titanium and control the characteristics and resistances. The microstructure of MAO coatings were characterized by scanning electron microscope(SEM) and laser scanning confocal microscopy, and the coating composition was analyzed by energy dispersive spectrometer(EDS) and X-ray diffraction(XRD). Thickness, roughness and corrosion resistance of coatings were evaluated. Compared with the coating obtained in different applied voltage stages, the coating formed on substrate alloy with first applied voltage 320 V for 180 s and second applied stage 420 V for 720 s shows a minimal roughness. The coating with first applied voltage 320 V for 120 s and second applied stage 420 V for 780 s exhibits a dense micro structure and the best corrosion resistance. The XRD result shows that the MAO coating is composed of TiO2 and Ti2 O3 in metastable state.