以合金 Ti-x Nb(x ＝30％~70％)为基底,硝酸为电解液,采用超快阳极氧化制备出了复合纳米多孔氧化膜.通过 XRD、SEM 和 TEM 等测试技术对所制备的复合纳米多孔氧化膜进行表征,发现氧化膜的表面孔径为10~30 nm,膜背面的孔径为20~60 nm,且纳米孔的孔间距随着 Nb 含量和电解液浓度的增加而增大.氧化膜的生长速度＞30μm/h.氧化薄膜的形成与硝酸的强氧化性活化了金属表面有关.氧化膜贯穿的原因可能是由于覆盖合金表面的纳米多孔氧化物薄膜产生的压应力和极化、浓度及温度梯度所产生的拉应力,两者之间的相互作用造成的氧化膜的自剥离.
Self-organized,through-hole,and ordered nano-porous array layers were fabricated by anodizing Ti-x Nb(x =30%-70%)alloys in a nitric acid electrolyte rapidly and directly.The nanoporous layers are character-ized by XRD,SEM and TEM.It was found that TiNb oxide nanoporous layers consist of straight and uniform pores of 10-30 nm in diameter,and the back side has uniform pores of 20-60 nm.The pore spacing increases with increasing Nb and nitric acid concentration.The growth rate of the oxidation layers is more than 30 μm/h. The formation of the layers is believed to be related to the strong oxidizability of nitric acid.And the penetration of the oxidation layers might be attributed to the interactions between the compressive stress by the layers and the tensile stress generated by the polarization,concentration and temperature gradient.
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