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DOI:
钛工业进展:2019,36(1):19-24
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FeSO4浓度对Ti-6Al-4V合金表面微弧氧化膜层性能的影响
Effect of FeSO4 Concentration on Properties of Micro-arc Oxidation Coatings on Ti-6Al-4V Alloys
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中文摘要: 通过电子显微镜(SEM)、X射线衍射(XRD)和X射线光电子能谱(XPS)分析了Ti-6Al-4V合金表面微弧氧化膜层的微观形貌、相组成和化学成分,采用拉伸试验机及红外光谱仪(FTIR)测试了膜层的结合强度以及5~20μm波段内的红外发射率。结果表明,随着(NaPO3)6电解液中FeSO_4浓度的升高,膜层的厚度、粗糙度及结合强度增加,红外发射率呈先增加后减小的趋势,其中,FeSO4浓度为6 g/L时膜层的红外发射率达到最大值0.86。结合XRD与XPS测试结果,推断元素Fe与P分别以非晶态的Fe2O3、H2PO4-、P2O7(4-)存在。Fe掺杂与非晶态的无序结构特征有利于局域能级的生成和增强原子间的极性振动,进而提高膜层的红外发射率。
Abstract:Micro-arc oxidation( MAO) coatings on Ti-6Al-4V alloys were fabricated in the electrolyte mixed with( NaPO3)6 and FeSO4 for various concentrations. And the microstructure,phase composition and chemical composition of the coatings were characterized by scanning electron microscope( SEM),X-ray diffraction( XRD) and X-ray photoelectron spectroscopy( XPS). The bonding strength and infrared emissivity in a wavelength range of 5 ~20 μm of the coatings were measured by the tensile test machine and Fourier Transform Infrared( FTIR). The results show that the thickness,roughness and bonding strength of the coatings increase with the addition of FeSO4,thus the infrared emissivity first increases and then decreases.The coating exhibits the highest infrared emissivity value( about 0. 86) when the concentration of FeSO4 is 6 g/L. The elements Fe and P existe as the amorphous state of Fe2O3,H2PO4-,P2O7(4-) in the coatings based on the XRD and XPS results. The Fe doping and disordered structure of the amorphous state are conducive to the generation of local energy levels and the enhancement of polar oscillation between atoms,which promote the increase of the infrared emissivity.
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基金项目:2018年西安市科技创新引导项目(201805042YD20CG26-7)
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