陽極氧化鋁膜經擴孔後再電解著色之研究

THE STUDY OF ELECTROLYTIC COLORING OF ANODIC ALUMINUM FILM AFTER PORE-WIDENING

李信毅(Shin-yi Li)

指導教授 ： 施幸祥

大同大學/工程學院/化學工程學系所/碩士(2008年)

摘要

本研究在探討擴孔時間對陽極膜與著色膜物性之影響，期望氧化鋁膜經磷酸擴孔後能獲得適當大小的孔洞，以利於進行電解著色時銀離子的沉積，並尋求最佳的黑色電解著色操作條件。
　　實驗結果發現，氧化鋁膜孔洞半徑會隨著擴孔時間增加而變大，同時氧化鋁膜的厚度也會變薄，且硬度及光澤度也跟著降低；擴孔後再著色的氧化鋁膜其L值、光澤度、反射率都會比未擴孔者低。而著色後的氧化膜，其硬度除了跟擴孔時間有關之外，著色時間越長硬度也會越低，使用的著色電壓越大也會造成氧化膜硬度減低。從腐蝕試驗可以證實，氧化鋁膜經由著色後能有效提升抗腐蝕性質。而EDS的測試中發現，經過擴孔後的氧化膜能比未擴孔者沉積更多Ag離子。
　　本實驗中最黑的氧化膜操作條件為擴孔時間2分鐘、著色電壓20V及著色時間20分鐘，著色膜有以下的物性：最低的ΔE值10.30，硬度為523Hv，光澤度為16.1，膜厚為12.6μm，在可見光波長下的反射率為6.16%。

關鍵字

反射率 ； 氧化鋁 ； 電解著色 ； 擴孔

並列摘要

In this research, the effects of pore- widening time on the physical properties anodic films and colored films are investigated. It is expected that suitable pore sizes can be obtained on the alumina film by the step of pore-widening in phosphoric acid. And the best operating conditions for depositing silver ions in the pores of the anodic films are found out.
It is found that, when the pore-widening time increase, anodic film thickness become thinner but pore diameter become larger, as well as hardness and gloss decrease. After electrolytic coloring, the pore-widened alumina films have low L value, gloss and reflectivity, which is lower than the films before pore-widening. The increasing of pore-widening time, electrolytic coloring time and voltage will decrease the film hardness. The corrosion test can prove that the corrosion resistance of the anodic films would be improved by electrolytic coloring. From EDS, it can find that more Ag ions can be deposited in the pores of the pore-widened anodic films.
The operating conditions to obtain the blackest anodic film in this experiment are: pore-widening time 2 minutes, electrolytic coloring voltage 20VAC and coloring time 20 minutes. The colored film has the following physical properties: the lowest ΔE value of 10.30, the hardness of 523Hv, the gloss of 16.1, the thickness of 12.6μm and the reflectivity of 6.16% at the visible light wavelength.

並列關鍵字

anodic aluminum ； electrolytic coloring ； pore-widening ； reflectivity

參考文獻

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[15] D. R. Gabe and I. H. Dowty, Surf. Coat. technol., 30(1987)309.