电沉积Cu对纳米结构Ti-16Zr合金腐蚀性能的影响

Effect of electrodeposition Cu on corrosion resistance of nanostructured Ti-16Zr alloy

采用阳极氧化法在Ti-16Zr合金表面上制备TiO2纳米管,然后通过恒电位电沉积法在TiO2纳米管上沉积Cu,获得Cu/TiO2,并分析基体Ti-16Zr合金、TiO2纳米管以及Cu/TiO2在人工模拟体液中的耐腐蚀性能。结果表明在基体Ti-16Zr合金上形成了整齐有序的TiO2纳米管阵列,平均直径大约为110nm,管壁厚度大约为20nm。在TiO2纳米管上沉积Cu后,其表面被相对均匀且致密的微米大小的球状颗粒覆盖,出现了明显的团聚现象。TiO2纳米管和Cu/TiO2发生了点蚀,而Ti-16Zr发生了均匀腐蚀。试样在人工体液中的耐腐蚀性排序为Ti-16Zr>TiO2纳米管>Cu/TiO2,即基体Ti-16Zr在人工体液中的耐腐蚀性最好。

TiO 2 nanotubes were prepared on the surface of Ti-16Zr alloy by anodizing.Then Cu was deposited on TiO 2 nanotubes by potentiostatic electrodeposition to obtained Cu/TiO 2.The corrosion behavior of Ti-16Zr alloy,TiO 2 nanotubes and Cu/TiO 2 were measured in artificial body fluids.The results showed that the regular and orderly TiO 2 nanotube array was formed on the matrix Ti-16Zr alloy.The average diameter and wall thickness of TiO 2 nanotubes are about 110 nm and 20 nm,respectively.After deposition of Cu on TiO 2 nanotubes,the surface was covered by relatively uniform and dense micronsized spherical particles and the obvious agglomeration was observed.Pitting corrosion occurred on TiO 2 nanotubes and Cu/TiO 2,while uniform corrosion occurred on Ti-16Zr alloy.The corrosion resistance of samples in artificial body fluids can be sorted in the following sequence:Ti-16Zr>TiO 2 nanotube>Cu/TiO 2,which means matrix Ti-16Zr has the best corrosion resistance in artificial body fluids.