인공타액 조건에 따른 치과용 티타늄의 갈바니부식 특성 (Galvanic Corrosion Characteristics of Dental Titanium under Various Artificial Saliva Conditions)

서지정보

· 발행기관 : 대한치과재료학회
· 수록지 정보 : 대한치과재료학회지 / 36권 / 1호 / 63 ~ 74페이지
· 저자명 : 최창혁, 이중배, 최기열

초록

Galvanic corrosion characteristics of titanium were studied in artificial saliva by coupling with Ti6Al4V, high gold, low
gold, Co-Cr, Ni-Cr, or amalgam alloy. The variation of coupled potential and galvanic current were recorded as a function
of time, and analyzed in terms of the electrochemical property of each metal in the couple. The effects of acid, chloride, or
fluoride addition were also investigated. Titanium acted as anode in most cases of galvanic coupling in artificial saliva. The
galvanic current was high in the beginning, but rapidly decreased to a few tenths of μA/㎠
in a hour. This trend slightly
changed by addition of acid or chloride, depending on its relative aggressiveness to each metal. The galvanic current
significantly increased by addition of fluoride with or without acid. For example, the galvanic current of titanium-high gold
alloy couple was maintained at μA/㎠
level by addition of fluoride, and tens of μA/㎠
level by addition of fluoride with
acid. The attack on the passive layer of titanium by fluoride, specially in combination with acid was considered as a primary
cause to weaken the corrosion resistance. Sodium fluoride presented a stronger effect as a fluoride source than sodium
monofluorophosphate. The result of galvanic coupling could be related to the electrochemical properties of two metals in the
couple. The coupled potential was always placed between two open circuit potentials, and the galvanic current could be
estimated from the intersection point of two potentiodynamic polarization curves.

영어초록

Galvanic corrosion characteristics of titanium were studied in artificial saliva by coupling with Ti6Al4V, high gold, low
gold, Co-Cr, Ni-Cr, or amalgam alloy. The variation of coupled potential and galvanic current were recorded as a function
of time, and analyzed in terms of the electrochemical property of each metal in the couple. The effects of acid, chloride, or
fluoride addition were also investigated. Titanium acted as anode in most cases of galvanic coupling in artificial saliva. The
galvanic current was high in the beginning, but rapidly decreased to a few tenths of μA/㎠
in a hour. This trend slightly
changed by addition of acid or chloride, depending on its relative aggressiveness to each metal. The galvanic current
significantly increased by addition of fluoride with or without acid. For example, the galvanic current of titanium-high gold
alloy couple was maintained at μA/㎠
level by addition of fluoride, and tens of μA/㎠
level by addition of fluoride with
acid. The attack on the passive layer of titanium by fluoride, specially in combination with acid was considered as a primary
cause to weaken the corrosion resistance. Sodium fluoride presented a stronger effect as a fluoride source than sodium
monofluorophosphate. The result of galvanic coupling could be related to the electrochemical properties of two metals in the
couple. The coupled potential was always placed between two open circuit potentials, and the galvanic current could be
estimated from the intersection point of two potentiodynamic polarization curves.

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