電解拋光再預浸漬處理對鋁材陽極氧化膜性質及電解著色之影響

The effect of pre-immersing after electropolishing on the anodic film properties and electrolytic coloring of aluminum

陳育民(Yu-min Chen)

指導教授 ： 施幸祥

大同大學/工程學院/化學工程學系所/碩士(2010年)

摘要

鋁金屬因活性大且具有質量輕、光澤度佳、導電性和導熱性高等優點，被廣泛的應用在工業以及日常生活上。目前許多研究都在找尋能使鋁材表面形成緻密皮膜的處理方法，本研究在陽極處理之前採三種不同處裡程序，一是一般的前處理，一是在陽極處理前有拋光之步驟，另一是使用表面改質劑進行表面改質。使用拋光方式使表面達到整平、光澤化與平滑化的效果以利陽極皮膜形成，使用表面改質劑鉬酸銨，使其表面產生一層水氧化鉬皮膜附蓋在鋁的表面上，俾於陽極處理過程中可緩慢且穩定的生成較緻密且較硬的氧化皮膜。
實驗結果發現，使用有拋光之鋁材做陽極處理，能使孔洞數增多且孔徑較大，但是結構較為鬆散，因此使用預浸漬步驟可以來改善因電解拋光所造成的皮膜耐腐蝕性及硬度下降的問題，並使用硝酸銀溶液電解著色來改善使用預浸漬雖使皮膜耐久性提高但是卻有著色困難之缺點，可於3A/dm2 獲得較黑的黑色皮膜硬度為419.9Hv、ΔE*為9.8，而單純拋光之鋁材表面則可於2A/dm2 獲得最黑的著色膜，ΔE*為6.53，但硬度值下降為312.3Hv。

關鍵字

電解著色 ； 陽極氧化 ； 表面處理 ； 陽極處理 ； 電解拋光 ； 預浸漬

並列摘要

Aluminum due to high activity and light weight, good gloss, high electrical conductivity and thermal conductivity, it is widely applied in industry and our life. At present, many studies are looking a process to form a dense film on aluminum. This study adopts three different process before the anodizing treatment, one is the convrtional pretreatment,another is the polished treatment before anodization,the other is preimmersing in the ammonium molybdate before anodization.The polishing method has the advantage of reaching the surface leveling, gloss and smoothing to form the anodic film. Using the surface modifier of ammonium molybdate, a molybdenum oxide film would cover the aluminum surface, it can make the anodic process slowly and steadily to build a more dense film more hard oxide film.
It was found that the use of polished anodized aluminum can make more holes and a larger aperture, but the structure is loose, the use of pre-immersing step to improve the corrosion resistance and hardness that decreased by the polished process. Though the immersing after polishing process can obtain a anodic film with better durability, but the Cu-coloring is with difficuty, the drawback can be overcomed by using AgNO3 for coloring, it can obtain the darker black film with hardness of 419.9Hv and ΔE* of 9.8 at 3A/dm2. While the single polishing process can obtain the blackest film with ΔE* of 6.53 at 2A/dm2 but it’s hardness drops to 312.3Hv.

並列關鍵字

anodic oxide ； surface treatment ； anodic treatment ； electropolishing ； electrolytic colorin ； pre-immersing

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