Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effects of Hafnium Addition on the Pitting Corrosion Behavior of Ti Alloys in Electrolyte Containing Chloride Ion

염소이온 함유된 용액에서 Ti합금의 부식특성에 미치는 Hafnium함량의 영향

  • Kim, Sung-Hwan (Department of Dental Materials & Research Center of Nano-Interface Activation for Biomaterials, School of Dentistry, Chosun University) ;
  • Choe, Han-Cheol (Department of Dental Materials & Research Center of Nano-Interface Activation for Biomaterials, School of Dentistry, Chosun University)
  • 김성환 (조선대학교 치의학전문대학원 치과재료학교실 & 생체재료나노계면활성화센터) ;
  • 최한철 (조선대학교 치의학전문대학원 치과재료학교실 & 생체재료나노계면활성화센터)
  • Received : 2012.04.26
  • Accepted : 2012.10.16
  • Published : 2012.10.31
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Abstract

The aim of this study was to investigate effects of hafnium content on the corrosion behavior of Ti alloys in electrolyte containing chloride ion. For this study, Ti-Hf binary alloys contained 10 wt%, 20 wt% and 30 wt% Hf were manufactured in a vacuum arc-melting furnace and subjected to heat treatment for 12h at $1000^{\circ}C$ in an argon atmosphere. The pitting corrosion behavior of the specimens was examined through potentiodynamic and potentiostatic tests in 0.9 wt% NaCl electrolyte at $36.5{\pm}1^{\circ}C$. The corrosion morphology of Ti-xHf alloys was investigated using optical microscopy (OM) and X-ray diffractometer (XRD). From the optical microstructures and XRD results, needle-like martensite ($\alpha$') phases of the Ti-xHf alloys increased with an increase of Hf addition. Corrosion current density $(I_{corr})$ and current density $(I_{300mV})$ in passive region decreased, whereas, corrosion potential increased with Hf content. At the constant potential ($300mV_{SCE}$), current density decreased as time increased.

Keywords

References

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