鈦合金熱氧化膜在人工生醫體液中耐磨耗腐蝕的研究

Wear and Corrosion Resistance of Thermal Oxide Film on Ti Alloy in a Simulated Body Solution

徐煥誠(Huan-Cheng Hsu)

指導教授 ： 李正國

共同指導教授 ： 譚安宏

健行科技大學/工學院/機械工程系碩士班/碩士(2018年)

摘要

本研究以鈦合金(Ti-6Al-4V)為基材，藉由鈦合金熱處理表面生成氧化膜後，浸泡於生醫體液(Hanks′ solution，pH 7.4)，分析熱氧化處理對鈦合金表面生成氧化物之機械性性質與耐腐蝕性影響效應。利用X-光繞射(XRD)、掃描式電子顯微鏡(SEM)及能量散射分析儀(EDS)，觀察表面氧化膜經浸泡腐蝕前後的結構、形態與元素成份和利用電化學技術及以塊對環(block-on-ring)磨耗方式在人工體液中進行表面腐蝕與磨耗研究。
實驗結果顯示，經過多種條件熱處理(400°C、500°C、600°C、700°C)的鈦合金(Ti-6Al-4V)，能有效提升鈦合金的表面性質，及有效提升鈦合金本身在人工體液中的耐腐蝕性與耐磨耗性，而最後可發現在較佳的熱處理條件(600°C24小時)下，有效阻止了釩(V)元素在氧化膜的析出，消除了其在生醫應用上有毒性的疑慮。

關鍵字

鈦合金 ； 熱氧化 ； 機械性質 ； 耐腐蝕性 ； 耐磨耗性

並列摘要

Thermal oxidation of Ti-6Al-4V alloy was performed to form oxide film, then immersion in a simulated body solution (Hanks' solution、pH7.4) for 168 hours to evaluate the effect of the oxide film on the mechanical and corrosion properties of the titanium alloy. Using X-ray diffraction (XRD) technique, scanning electron microscopy (SEM), and X-ray energy dispersive spectrometer (EDS) observed the structure, surface morphology and elemental analysis of the oxide film before and after the immersion corrosion test. Measurements of electro chemical technigue and block-on-ring wear corrosion are also studied for titanium alloy in Hank' solution.
Experimental results indicated that the Ti-6Al-4V alloy after various thermal treatments including different temperatures of 400-700 ºC and times of 14-60 h could effectively raise the surface mechanical property corrosion and wear resistance properties of Ti-6Al-4V alloy in the Hanks' solution. Moreover, the best thermal oxidation at 600 ºC for 24 h was found that Vanadium (V) element diminished in the formed oxide film before and after immersion corrosion test. Consequently, this oxide film is respected to biomedical applications owing to its free of presumably toxic V element when using in human body.

並列關鍵字

Ti-6Al-4V alloy ； Thermal oxidation ； Mechanical property ； Corrosion resistance

參考文獻

(1)莫畏，鈦，冶金工業出版社，民國九十七年。

(2)王桂生，鈦的應用技術，中南大學出版社，民國九十六年。

(3)P. Kofstad: “High temperature corrosion”, Elsevier Applied Science, 1988.

(4)M. Long, H.J. Rack, “Titanium alloys in total joint replacement—a materials science perspective”, Biomaterials 19, pp.1621–1639 ,1998.

(5)M.F. Lopez, J.A. Jimenez, A. Gutierrez“ Corrosion study of surface modified vanadium-free titanium alloys”, Electrochim Acta 48, pp.1395–1401, 2003.