本研究主要探討Ti-6Al-4V雙相鈦合金在水溶液及離子液體環境中之優選腐蝕行為。在水溶液環境方面，以電化學原子力顯微鏡(electrochemical atomic force microscope, ECAFM)，對微觀組織受不同熱處理條件改變之Ti-6Al-4V合金，於0.5 M H2SO4 + 1 M HCl還原性混酸水溶液中，進行原位腐蝕觀測，以了解其腐蝕行為與機制。而鈦金屬在離子液體環境中之腐蝕或鈍化行為，至今仍未有充分的研究探討，且離子液體之組合種類繁多，為簡化其腐蝕或鈍化行為機制之探討，先以商業級純鈦為對象，於四種型態之離子液體，分別為正-丁基-正-甲基呋喃二氰胺(N-butyl-N-methylpyrrolidinium dicyanamide, BMP-DCA)、氯化膽鹼-尿素(ChCl-urea)、氯化膽鹼-氯化鋅(choline chloride - chlorozincate, ChCl-ZnCl2)及氯化鋁-氯化-1-乙基-3-甲基咪唑(chloroaluminate-1-ethyl-3-methylimidazolium chloride, AlCl3-EMIC)等，進行電化學性質測試，以對鈦金屬在離子液體系統之腐蝕及鈍化性質有基礎的了解，再對腐蝕行為有特殊影響之離子液體為對象，以Ti-6Al-4V雙相鈦合金進行優選腐蝕行為探討。
微觀組織改變對Ti-6Al-4V合金腐蝕行為影響方面，固溶處理後爐冷之Ti-6Al-4V合金，因其主要組成相（α、β相）之化學成分差異較大，使其在0.5 M H2SO4 + 1 M HCl還原性混酸水溶液中，可觀測到α相優先溶解之腐蝕行為，且在α/β相界處亦因加凡尼效應的作用，α、β相腐蝕速率不同的現象更為顯著；反之，以空冷處理之Ti-6Al-4V合金，其兩相化學組成差異較小，兩相上所形成之鈍化膜化學成分及元素分布相近，故優選腐蝕及加凡尼效應不易發生。而電位對Ti-6Al-4V合金之腐蝕行為影響方面，發現爐冷處理之Ti-6Al-4V合金在開路狀況下，浸漬一段時間後，發生電位自-0.5 VPt驟降至-0.9 VPt之現象，並發生顯著的α相溶解。而在定電位原位腐蝕觀測，僅於-0.9 VPt下發生α相優先腐蝕，而高於-0.9 VPt時並無顯著的腐蝕現象發生。空冷處理之Ti-6Al-4V合金亦僅在-0.9VPt下發生顯著的腐蝕現象，但α、β兩相均有溶解現象，顯示兩相化學組成的差異不致造成優選腐蝕發生。
純鈦在離子液體中之腐蝕或鈍化行為方面，由動電位極化測試發現純鈦在陰陽離子皆為有機分子構成(如BMP-DCA、ChCl-urea)，或空氣中可穩定存在之路以士酸性離子液體(如ChCl-ZnCl2)中仍可鈍化，而在空氣中無法穩定存在之EMIC-AlCl3離子液體中則沒有鈍化行為。以XPS分析商業級純鈦表面於BMP-DCA、ChCl-urea及ChCl-ZnCl2離子液體中形成之鈍化層，發現除TiN外尚有含氮分子之吸附並發生反應形成氮化物，而造成鈦的鈍化，此與吾人習知之鈦在腐蝕環境中的鈍化行為迥異。
由於鈦在EMIC-AlCl3離子液體系統中，腐蝕現象較顯著，故以Ti-6Al-4V合金於此離子液體系統中之優選腐蝕行為進行研究。在EMIC-AlCl3離子液體系統之陰離子對Ti-6Al-4V合金之侵蝕性由高至低依序為Al2Cl7－＞AlCl4－ + Cl－＞AlCl4－。且Ti-6Al-4V合金不論於鹼性、中性或酸性之EMIC-AlCl3離子液體中，表面無法重新鈍化，而會隨著電位上升發生顯著的陽極溶解反應。本研究發現，酸性EMIC-AlCl3離子液體之Al2Cl7－可引發Ti-6Al-4V合金α相之優先溶解，而中性EMIC-AlCl3中之AlCl4－可引起β相之優先溶解，且隨蝕刻之電位提高，溶解速率之差異亦隨之提高。

Selective dissolution behavior of Ti-6Al-4V alloy in aqueous solution and ionic liquids (ILs) were investigated in this study. Selective dissolution of the Ti-6Al-4V alloy in aqueous solution was investigated by means of conducting in-situ corrosion monitoring experiment in 0.5 M H2SO4 + 1 M HCl mixed reducing acid by using electrochemical atomic force microscope (ECAFM). On the other hand, the corrosion behavior of Ti metal in ILs was first focused on the electrochemical behaviors of commercial pure Ti in four different kinds of ILs, namely N-butyl-N-methylpyrrolidinium dicyanamide (BMP-DCA), choline chloride-urea (ChCl-urea), choline chloride-chlorozincate (ChCl-ZnCl2), and 1-ethyl-3-methylimidazolium chloride aluminum chloride (EMIC-AlCl3) for the reason of simplification of the study of the corrosion or passivation mechanism.
For solution annealed followed by furnace-cooled Ti-6Al-4V titanium alloy, selective dissolution of α phase and non-uniform corrosion at α/β interface caused by galvanic effect resulted from significant chemical composition divergence was clearly observed. However, no selective dissolution was found in the air-cooled alloy due to the similarity in chemical composition of the passive film formed on α and β phases with less compositional divergence. The effect of potential on the corrosion behavior was also explored. Selective dissolution of α phase with respect to β phase occurred when the potential was controlled at -0.9 VPt. However, for the air-cooling treated Ti-6Al-4V alloy, also considerable dissolution was also found during potentiostatic etching at -0.9 VPt, but no selective dissolution behavior was observed due to less compositional divergence of α and β phases.
The potentiodynamic polarization measurement results show that CP Ti could be passivated in BMP-DCA, ChCl-urea and ChCl-ZnCl2 ILs. However, in EMIC-AlCl3 ionic liquid, the polarization curve only exhibited active dissolution behavior, without the presence of a passive region. The passivation behavior of CP Ti in ILs was also characterized by means of X-ray photoelectron spectroscopy (XPS) to examine the roles of ILs with different chemical structures. However, XPS analyses revealed that the passive films formed in BMP-DCA, ChCl-urea and ChCl-ZnCl2 ILs consisted as least two layers. Beside an IL-adsorbed surface layer, nitrogen-containing compounds (including titanium nitrides) were formed in the inner layer of the passive films, which were responsible for passivation providing effective corrosion resistance for CP Ti.
Electrochemical behavior and selective dissolution of Ti-6Al-4V alloy in 1-ethyl-3-methylimidazolium chloride aluminum chloride (EMIC-AlCl3) ionic liquid (IL) system where the composition ranged from Lewis base to acid was investigated. The results show that Ti-6Al-4V alloy has the highest corrosion susceptibility when heptachlorodialuminate ion (Al2Cl7-) was the anion in IL. Selective dissolution of Ti-6Al-4V alloy was found when Al2Cl7- presented in EMIC-AlCl3 IL while AlCl4- resulted in β phase preferential dissolution.

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