Titania films with nano-sized pores were prepared on the NaOH?HCl pretreated NiTi alloy substrate by sol?gel method.A crack-free film is obtained for the sample with a dense inner layer and a porous outside layer(s...Titania films with nano-sized pores were prepared on the NaOH?HCl pretreated NiTi alloy substrate by sol?gel method.A crack-free film is obtained for the sample with a dense inner layer and a porous outside layer(sample TC1+1).The X-ray diffraction shows that the titania films are composed of anatase,and a little Ni4Ti3 phase in the heat treated substrate is also detected.The X-ray photoelectron spectroscopy results indicate that the titania film completely covered the NiTi substrate for sample TC1+1.The sample TC1+1 is hydrophilic with a contact angle about 20°,and UV illumination treatment for 15 min further decreases the contact angle to(9.2±3.2)°.The potentiodynamic polarization test in 0.9% NaCl solution reveals a better corrosion resistance of sample TC1+1 than the polished NiTi sample.展开更多
基金Project(xjj2011096)supported by the Fundamental Research Fund for the Central Universities,ChinaProject(201107)supported by the Open Project Program of State Key Laboratory of Metastable Materials Science and Technology,ChinaProject(50901058)supported by the National Natural Science Foundation of China
文摘Titania films with nano-sized pores were prepared on the NaOH?HCl pretreated NiTi alloy substrate by sol?gel method.A crack-free film is obtained for the sample with a dense inner layer and a porous outside layer(sample TC1+1).The X-ray diffraction shows that the titania films are composed of anatase,and a little Ni4Ti3 phase in the heat treated substrate is also detected.The X-ray photoelectron spectroscopy results indicate that the titania film completely covered the NiTi substrate for sample TC1+1.The sample TC1+1 is hydrophilic with a contact angle about 20°,and UV illumination treatment for 15 min further decreases the contact angle to(9.2±3.2)°.The potentiodynamic polarization test in 0.9% NaCl solution reveals a better corrosion resistance of sample TC1+1 than the polished NiTi sample.