Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 19, Issue 4, Pages 857-861Publisher
ELSEVIER
DOI: 10.1016/S1003-6326(08)60364-7
Keywords
Ti alloy; nanotube; TiN coating; corrosion behaviors
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Funding
- National Research Foundation of Korea [2009-0074672]
- National Research Foundation of Korea [2009-0074672] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Ti-xHf (x=10%, 20%, 30% and 40%, mass fraction) alloys were prepared by arc melting, and the microstructure was controlled for 24 It at 1 000 degrees C 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 alpha' phase with Hf content. The amorphous oxide surface is transformed to crystalline anatase phase. TiN coated nanotube surface has a good corrosion resistance.
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