치아색으로 코팅된 NiTi 와이어의 전기화학적 특성
Electrochemical Characteristics of Tooth Colored NiTi Wire
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
NiTi alloy has been used for orthodontic wire due to good mechanical properties, such as elastic strength, friction resistance, and high corrosion resistance. Recently, these wire were coated by polymer and ceramic materials for aesthetics. The purpose of this study was to investigate electrochemical characteristics of tooth colored NiTi wire using various instruments. Wires (round type and rectangular type) were used, respectively, for experiment. Polymer coating was carried out for wire. Specimen was investigated with optical microscopy (OM), field emission scanning electron microscopy (FE-SEM) and energy dispersive x-ray spectroscopy (EDS). The corrosion properties of the specimens were examined using potentiodynamic tests (potential range of -1500 ~ 2000 mV) and electrochemical impedance spectroscopy (frequency range of 100 kHz ~ 10 mHz) in a 0.9 % NaCl solution by potentiostat. From the results of polarization behavior, the passive region of non-coated NiTi wire showed largely, whereas, the passive region of curved NiTi wire showed shortly in anodic polarization curve. In the case of coated NiTi wire, pitting and crevice corrosion occurred severely at interface between non-coated and coated region. From the results of EIS, polarization resistance(Rp) value of non-coated round and rectangular NiTi wire at curved part showed 5.10×105 Ωcm2 and 4.43×105 Ωcm2. lower than that of coated NiTi wire. Rp of coated round and rectangular NiTi wire at curved part showed 1.31×106 Ωcm2 and 1.19×106 Ωcm2.
Abstract
NiTi alloy has been used for orthodontic wire due to good mechanical properties, such as elastic strength, friction resistance, and high corrosion resistance. Recently, these wire were coated by polymer and ceramic materials for aesthetics. The purpose of this study was to investigate electrochemical characteristics of tooth colored NiTi wire using various instruments. Wires (round type and rectangular type) were used, respectively, for experiment. Polymer coating was carried out for wire. Specimen was investigated with optical microscopy (OM), field emission scanning electron microscopy (FE-SEM) and energy dispersive x-ray spectroscopy (EDS). The corrosion properties of the specimens were examined using potentiodynamic tests (potential range of -1500 ~ 2000 mV) and electrochemical impedance spectroscopy (frequency range of 100 kHz ~ 10 mHz) in a 0.9 % NaCl solution by potentiostat. From the results of polarization behavior, the passive region of non-coated NiTi wire showed largely, whereas, the passive region of curved NiTi wire showed shortly in anodic polarization curve. In the case of coated NiTi wire, pitting and crevice corrosion occurred severely at interface between non-coated and coated region. From the results of EIS, polarization resistance(Rp) value of non-coated round and rectangular NiTi wire at curved part showed 5.10×105 Ωcm2 and 4.43×105 Ωcm2. lower than that of coated NiTi wire. Rp of coated round and rectangular NiTi wire at curved part showed 1.31×106 Ωcm2 and 1.19×106 Ωcm2.
참고문헌 (11)
- 윤준태, "Study on the Effect of Surface Finishing Methods on Pitting Corrosion Behavior of 304 Stainless Steel Alloy", CORROSION SCIENCE AND TECHNOLOGY, 8(6), pp.209~217 (2009), 한국부식방식학회
- U. J. Lim, "Prevention of Crevice Corrosion of STS 304 Stainless Steel by a Mg-alloy Galvanic Anode", CORROSION SCIENCE AND TECHNOLOGY, 5(3), pp.90~93 (2006), 한국부식방식학회
- 오근택, "교정용 초내식성 스테인리스강(UNS No. S32050) 선재의 내식성", CORROSION SCIENCE AND TECHNOLOGY, 30(4), pp.184~195 (2001), 한국부식방식학회
- J. R. Bednar, , Am. J. Orthod., 100, pp.513~ (1991)
- A. Kaplila, , Am. J. Orthod., 98, pp.117~ (1990)
- P. V. Angolkar, , Am. J. Orthod., 98, pp.499~ (1990)
- 김강삼, "중간층을 이용한 DLC 박막의 밀착력에 관한 연구", 한국표면공학회지, 43(3), pp.127~131 (2010), 한국표면공학회
- H.Y.Yang, "Advanced Metallic Materials", pp.494~ (1995), MoonUnDang Co.
- J. E. G. Gonzalez, , J. Electroanal. Chem., 471, pp.109~ (1999)
- E. Kobayashi, , Mater. Sci. Mater. Med., 9, pp.567~ (1998)
- A. K. Shukla, , Intermetallics, 13, pp.631~ (2005)