Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Corrosion Behaviors of TiN Coated Dental Casting Alloys

TiN피막 코팅된 치과주조용 합금의 부식거동

  • Jo, Ho-Hyeong (Department of Dental Materials & Research Center of Nano-Interface Activation for Biomaterials, College of Dentistry, 2nd Stage of Brain Korea 21 for College of Dentistry, Chosun University) ;
  • Park, Geun-Hyeng (Department of Dental Materials & Research Center of Nano-Interface Activation for Biomaterials, College of Dentistry, 2nd Stage of Brain Korea 21 for College of Dentistry, Chosun University) ;
  • Kim, Won-Gi (Department of Dental Materials & Research Center of Nano-Interface Activation for Biomaterials, College of Dentistry, 2nd Stage of Brain Korea 21 for College of Dentistry, Chosun University) ;
  • Choe, Han-Cheol (Department of Dental Materials & Research Center of Nano-Interface Activation for Biomaterials, College of Dentistry, 2nd Stage of Brain Korea 21 for College of Dentistry, Chosun University)
  • 조호형 (조선대학교 치과대학 치과재료학교실 및 생체재료나노계면활성화센터, 2단계 BK21) ;
  • 박근형 (조선대학교 치과대학 치과재료학교실 및 생체재료나노계면활성화센터, 2단계 BK21) ;
  • 김원기 (조선대학교 치과대학 치과재료학교실 및 생체재료나노계면활성화센터, 2단계 BK21) ;
  • 최한철 (조선대학교 치과대학 치과재료학교실 및 생체재료나노계면활성화센터, 2단계 BK21)
  • Received : 2008.09.21
  • Published : 2009.02.25
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Abstract

Corrosion behaviors of TiN coated dental casting alloys have been researched by using various electrochemical methods. Three casting alloys (Alloy 1: 63Co-27Cr-5.5Mo, Alloy 2: 63Ni-16Cr-5Mo, Alloy 3: 63Co-30Cr-5Mo) were prepared for fabricating partial denture frameworks with various casting methods; centrifugal casting(CF), high frequency induction casting(HFI) and vacuum pressure casting(VP). The specimens were coated with TiN film by RF-magnetron sputtering method. The corrosion behaviors were investigated using potentiostat (EG&G Co, 263A. USA) in 0.9% NaCl solution at $36.5{\pm}1^{\circ}C$. The corrosion morphologies were analyzed using FE-SEM and EDX. Alloy 1 and Alloy 2 showed the ${\alpha}-Co$ and ${\varepsilon}-Co$ phase on the matrix, and it was disappeared in case of TiN coated Alloy 1 and 2. In the Alloy 3, $Ni_2Cr$ second phases were appeared at matrix. Corrosion potentials of TiN coated alloy were higher than that of non-coated alloy, but current density at passive region of TiN coated alloy was lower than that of non-coated alloy. Pitting corrosion resistances were increased in the order of centrifugal casting, high frequency induction casting and vacuum pressure casting method from cyclic potentiodynamic polarization test.

Keywords

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