【摘要】 采用微弧氧化技术在TiNbZrFe合金表面制备出含钙磷成分的多孔氧化膜,通过人体模拟液浸泡的方法诱导生成羟基磷灰石,并利用电化学阻抗谱(EIS)研究其在人体模拟液中浸泡不同时间后的耐腐蚀性能.结果表明,经400 V电压微弧氧化后TiNbZrFe合金表面氧化膜的形貌与成分达到最优化,且明显有α-Ca3(PO4)2相生成;α-Ca3(PO4)2相能够起到良好的诱导生成羟基磷灰石(HA)的作用,在人体模拟液中浸泡1 d后,通过XRD检测出有HA相生成,导致微弧氧化膜层表面的微孔被诱导生成物覆盖填充明显,较小微孔完全消失;随着浸泡时间的延长,经过微弧氧化膜诱导生成的HA涂层不断增厚,EIS结果表明其具有良好的隔绝渗透作用,能够阻碍腐蚀性介质在溶液和金属界面之间扩散和迁移,从而起到保护基体抗腐蚀的作用.更多还原

【Abstract】 Ca-P containing porous oxidation film w as prepared on the surface of biomedical β-type TiN bZrFe alloy by micro-arc oxidation( M AO),and the hydroxyapatite stoichiometric( HA) w as successfully induced through immerging the film in a simulated body fluid. T he electrochemical impedance spectroscopy( EIS) w as carried out to study the corrosion properties of the coated alloy immerged in SBF for different times. T he results show ed that the composition and the morphology of the oxide film on T iN bZ rFe alloy w as optimized at a M AO voltage of 400V. An α-Ca3( PO4)2phase formed in the film and this phase played an effective role to induce HA,w hich can be detected by XR D through immerging it for 1 day. A porous HA film covered on the alloy surface,and even the smaller pores entirely disappeared. T he thickness of HA coatings increased w ith the immersing time,EIS results show ed that the HA coatings have effective isolating effect,w hich can hinder diffusion and transmission migration of the corrosive medium through the interface betw een the corrosive solution and the metal,so that the substrate can be protected from corrosion.更多还原