TiN피막 코팅된 치과주조용 합금의 부식거동 (Corrosion Behaviors of TiN Coated Dental Casting Alloys)

서지정보

· 발행기관 : 대한금속·재료학회
· 수록지 정보 : 대한금속·재료학회지 / 47권 / 2호 / 129 ~ 137페이지
· 저자명 : 조호형, 박근형, 최한철, 김원기

초록

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 ± 1oC. The corrosion morphologies
were analyzed using FE-SEM and EDX. Alloy 1 and Alloy 2 showed the α-Co and ε-Co phase on the matrix,
and it was disappeared in case of TiN coated Alloy 1 and 2. In the Alloy 3, Ni2Cr 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.

영어초록

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 ± 1oC. The corrosion morphologies
were analyzed using FE-SEM and EDX. Alloy 1 and Alloy 2 showed the α-Co and ε-Co phase on the matrix,
and it was disappeared in case of TiN coated Alloy 1 and 2. In the Alloy 3, Ni2Cr 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.

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