電泳TiO2於陽極氧化鋁中並探討其著色膜表面特性之研究

Application of AnodicAluminum Oxide(AAO) for Electrophoretic Deposition of TiO2 Particles and Investigating the Properties of Coloring Surface

張恆誠(HENG-CHENG CHANG)

指導教授 ： 林昭任

國立中正大學/工學院/化學工程學系/碩士(2013年)

摘要

鋁鎂合金經由二次陽極處理後，可以得到孔洞較大且平整的膜，用奈米TiO2的懸浮液來做電泳著色，有時間短且濃度稀，就可得到純白陽極氧化膜的優點。本研究在探討不同混酸系統下製作出的陽極氧化鋁其孔洞大小、孔密度及孔隙度並以四種不同矽烷來改質二氧化鈦，接著以色差儀找出最佳之電泳參數及色澤，最後以SEM觀察電泳後的填孔情形並測試氧化膜表面的硬度與抗腐蝕性。 結果發現，對於陽極氧化鋁製作而言，磷硫酸系統下且磷硫酸比為2:1時，其平均孔洞大小為53nm，孔密度為2.178×1014並且擁有最大的孔隙度 0.433，而磷草酸方面以電壓90V有其較佳之孔隙度與孔密度且平均孔洞大小為125nm。而改質二氧化鈦方面，合成效率隨矽烷濃度增加而上升。然而矽烷AP-S 5110有最強之粒子帶電性，而矽烷AP-S6010有最好的合成效率。 色差實驗顯示，電泳電壓越大、時間越久則氧化膜顏色越白，電泳電壓為200V，電泳時間15分鐘為較合適之電泳條件且以磷硫酸系統下有較佳之色澤。以SEM觀察截面填孔情形發現，磷草酸系統下有預填金屬Ni且以矽烷AP-S5110改質的二氧化鈦有較佳之填孔效果，而氧化膜表面之硬度與抗腐蝕性皆獲得改善。

關鍵字

色差 ； 陽極氧化鋁 ； 電泳 ； 二氧化鈦 ； 矽烷 ； 鋁鎂合金

並列摘要

The aluminum-magnesium alloy can grow a flat film with larger pores after the secondary anodic treatment. Applying nano titanium dioxide (TiO2) particles into the solution of the electrophoresis coloring has advantages of short operating time and dilute concentration to obtain pure white anodic film. The aim of this paper is to investigate pore size, pore density and porosity of anodized film in mixed acids, and using four different silanes to modify TiO2 particles to find the best conditions of electrophoresis coloring. Finally, morphology, hardness and corrosion resistance of the anodized films were also studied.
Results show that as increasing the ratio of phosphoric acid to sulfuric acid to 2, the anodized film has the largest porosity of 0433 with pore size of 53nm and pore density of 2.178×1014. Applying 90V to the system of phosphoric acids and oxalic acids, it can obtain the better pore density and porosity with pore size of 125nm. The grafting efficiency increases with silane concentration. However, the silane AP-S 5110 has strong chargeability grafting on TiO2 particles and the silane AP-S 6010 has the best grafting efficiency. The colorimeter revealed that, when increasing voltage and time of electrophoresis coloring the color of oxide
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film was nearly pure white. It had the best condition on applying 200V and coloring time 15 min. under the system of phosphoric acids and sulfuric acids. The side view observation by SEM showed that, it had the best filling efficiency when pre-filling Ni in anodized films and the TiO2 particles were modified by the silane AP-S 5110 under the system of phosphoric acids and oxalic. By this way, the hardness and corrosion resistance were improved on the surface of anodized films. Keywords: TiO2, silanes, electrophoresis, anodized aluminum, color

並列關鍵字

color ； anodized aluminum ； electrophoresis ； silanes ； TiO2

參考文獻

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