氟濃度及應變量對鈦金屬耐蝕性質之影響

Effect of Fluoride Concentration and Strain on the Corrosion Resistance of Titanium

黃何雄(Her-Hsiung Huang)

《防蝕工程》 16卷1期 (2002/03) Pp. 21-30

https://doi.org/10.6376/JCCE.200203.0021

摘要

Titanium, which has marked corrosion resistance, can corrode in some fluoride-containing environments. In this study, the corrosion behavior of titanium in 1% NaCl+0～1% NaF solution (pH=6) under different tensile strains was investigated with the electrochemical impedance spectroscopy (EIS) measurement technique. The polarization resistance (Rp), which is inversely proportional to the corrosion rate, of titanium in the test solution was obtained from the EIS data. Different tensile strains, namely 1, 2, 4, 5 and 10%, were applied to the test specimens with a tensile testing machine during the corrosion tests. Surface chemical analyses were performed with X-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES), and energy dispersive spectroscopy (EDS). Corrosionmorphology was characterized with scanning electron microscope (SEM). The results show that the NaF concentration and tensile strain exerted a statistically significant influence on the Rp (p＜0.001). The Rp decreased with increasing NaF concentration and increasing tensile strain. When the NaF concentration was lower than 0.01%, the high Rp value was mainly ascribed to the formation of protective titanium dioxide (TiO2) on the metal surface. However, when the NaF concentration was higher than 0.1%, the protectiveness of TiO2 was overcome by fluoride ions, leading to significant corrosion of the titanium. In view of the protection against fluoride ion attack in oral environments, the study recommends the use of optimal fluoride-containing prophylaxis agents. The effect of tensile strain on the corrosion resistance of titanium is also discussed.

關鍵字

氟 ； 抗張應變 ； 腐蝕 ； 極化電阻 ； 鈦

並列摘要

Titanium, which has marked corrosion resistance, can corrode in some fluoride-containing environments. In this study, the corrosion behavior of titanium in 1% NaCl+0～1% NaF solution (pH=6) under different tensile strains was investigated with the electrochemical impedance spectroscopy (EIS) measurement technique. The polarization resistance (Rp), which is inversely proportional to the corrosion rate, of titanium in the test solution was obtained from the EIS data. Different tensile strains, namely 1, 2, 4, 5 and 10%, were applied to the test specimens with a tensile testing machine during the corrosion tests. Surface chemical analyses were performed with X-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES), and energy dispersive spectroscopy (EDS). Corrosionmorphology was characterized with scanning electron microscope (SEM). The results show that the NaF concentration and tensile strain exerted a statistically significant influence on the Rp (p＜0.001). The Rp decreased with increasing NaF concentration and increasing tensile strain. When the NaF concentration was lower than 0.01%, the high Rp value was mainly ascribed to the formation of protective titanium dioxide (TiO2) on the metal surface. However, when the NaF concentration was higher than 0.1%, the protectiveness of TiO2 was overcome by fluoride ions, leading to significant corrosion of the titanium. In view of the protection against fluoride ion attack in oral environments, the study recommends the use of optimal fluoride-containing prophylaxis agents. The effect of tensile strain on the corrosion resistance of titanium is also discussed.

並列關鍵字

fluoride ； tensile strain ； corrosion ； polarization resistance ； titanium