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題名 | 氟濃度及抗張應變量對鈦腐蝕之影響=Effects of Fluoride Concentration and Tensile Strain on the Corrosion of Titanium |
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作者 | 黃何雄; 徐啟智; 胡素婉; 朱裕華; 周林世珍; 周明勇; | 書刊名 | 中華牙醫學雜誌 |
卷期 | 20:1 2001.03[民90.03] |
頁次 | 頁21-28 |
分類號 | 416.98 |
關鍵詞 | 氟; 拉伸應變; 腐蝕; 極化電阻; 鈦; Fluoride; Tensile strain; Corrosion; Polarization resistance; Titanium; |
語文 | 中文(Chinese) |
中文摘要 | 本研究利用電化學交流阻抗頻譜(electrochemical impedance spectroscopy, EIS)量測技術定量探討氟濃度及抗張應變量對鈦腐蝕行為的影響。 選用的材料為ASTM grade 2的商業級純鈦。利用自行設計的抗張試驗機來控制鈦試片所受到的各種抗張應變量(分別為0、2、5及10%),並選用含不同NaF濃度(0.001∼1%)的1% NaCl混合水溶液為試驗環境(pH=6)。利用EIS測得材料的極化電阻(polarization resistance, Rp),Rp值越大表示材料抗腐蝕能力愈佳。 利用 X 光光電子能譜及波長散佈光譜進行材料表面的化學分析,並以掃瞄式電子顯微鏡觀察材料表面腐蝕形態。實驗結果顯示,Rp值受到應變量及 NaF 濃度明顯的影響( p<0.001 ),且隨著抗張應變量及 NaF濃度的增加而漸減。 不論抗張應變量的大小,當NaF濃度低於0.01%時,鈦表面的氧化膜(主要為TiO�砥^仍具有良好的保護性;當NaF濃度超過0.1%,鈦表面氧化膜已遭氟離子破壞而生成Ti-F的化合物(Na�� TiF�腹^。從避免鈦補綴物在口腔中遭氟離子侵蝕的角度而言,本研究結果在臨床上可提供牙科用預防藥劑(prophylactic agents)中含氟量多寡的選用參考,並幫助瞭解應變量對鈦腐蝕性質的影響。 |
英文摘要 | 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 0, 2, 5 and 10%, were applied to the test specimens with a custom-made tensile testing machine during the corrosion tests. Surface chemical analyses were performed with X-ray photoelectron spectroscopy (XPS) and energy dispersive spectroscopy (EDS). Corrosion morphology 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 (TiO��) on the metal surface. However, when the NaF concentration was higher than 0.1%, the protectiveness of TiO�� 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 prophylactic agents. The effect of tensile strain on the corrosion resistance of titanium is also discussed. |
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