掺杂HfO2对钛合金微弧氧化膜层特性的影响

Effect of doping HfO2 on the properties of micro-arc oxidation film on titanium alloy

摘要:

在电解液中添加HfO2对Ti-6Al-4V钛合金进行微弧氧化处理，通过表征微弧氧化膜表、截面形貌，膜层成分及电化学行为，并测量膜层厚度、硬度、粗糙度等参数来研究添加HfO2对钛合金微弧氧化膜层特性的影响。结果表明：添加HfO2后，微弧氧化膜层主要成分是Al2TiO5、TiO2和γ-Al2O3。较合适浓度的HfO2能促进成膜反应，改善微弧氧化膜的微观结构，提高膜层的厚度、硬度并降低表面粗糙度，且膜层试样具有双层膜结构，膜层试样的耐腐蚀性能好于原基体。HfO2浓度为3.0g/L时所获得的微弧氧化膜层综合性能最佳。

Abstract:

The Ti-6Al-4V titanium alloy was treated with micro-arc oxidation by adding HfO2 into the electrolyte. The effect of adding HfO2 on the characteristics of the micro-arc oxidation film of titanium alloy was studied by characterizing the surface and cross-section morphology of the micro-arc oxidation film, the composition of the film and the electrochemical behavior, and measuring the thickness, hardness, roughness and other parameters of the film. The results show that after adding HfO2, the main components of the micro-arc oxidation film are Al2TiO5,TiO2 and γ-Al2O3.The appropriate concentration of HfO2 can promote the film-forming reaction, improve the microstructure of the micro-arc oxidation film, improve the thickness and hardness of the film and reduce the surface roughness. The film sample has a double-layer film structure, and the corrosion resistance of the film sample is better than the original substrate. When the concentration of HfO2 is 3.0g/L, the comprehensive performance of the micro-arc oxidation coating is the best.