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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 4    August 2009

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Effects of TiN film coating on electrochemical behaviors of nanotube formed Ti-xHf alloys
Kang LEE1, Won-Gi KIM1, Joo-Young CHO1, Sang-Won EUN2, Han-Cheol CHOE1

1. Department of Dental Materials & Research Center of Nano-Interface Activation for Biomaterials,
College of Dentistry, Chosun University, Gwangju, 520-825, Korea;
2. Department of Applied Advanced Materials, Korea Polytechnic Ⅴ Colleges, Gwangju, 501-759, Korea

Abstract:Ti-xHf (x=10%, 20%, 30% and 40%, mass fraction) alloys were prepared by arc melting, and the microstructure was controlled for 24 h at 1 000 ℃ in argon atmosphere. The formation of nanotube was conducted by anodizing on Ti-Hf alloys in 1.0 mol/L H3PO4 electrolytes with small amounts of NaF at room temperature. And then TiN coatings were coated by DC-sputtering on the anodized surface. Microstructures and nanotube morphology of the alloys were examined by field emission scanning electron microscopy(FE-SEM) and X-ray diffractometry(XRD). The corrosion properties of the specimens were examined through potentiodynamic test (potential range from −1 500 to 2 000 mV) in 0.9 % NaCl solution by potentiostat. The microstructure shows the acicular phase and α′ phase with Hf content. The amorphous oxide surface is transformed to crystalline anatase phase. TiN coated nanotube surface has a good corrosion resistance.

 

Key words: Ti alloy; nanotube; TiN coating; corrosion behaviors

ISSN 1672-7029
CN 43-1423/U

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