化學蝕刻對電解著色陽極膜之影響

THE EFFECT OF CHEMICAL ETCHING ON ELECTROLYTICALLY COLORED ANODIC FILM

陳冠翰(Guan-Han 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(2011年)

摘要

本研究探討在前處理步驟添加化學蝕刻步驟對於著色陽極氧化膜性質之影響，期望使用經化學蝕刻能獲得太陽光吸收率良好的著色膜。
實驗結果發現，使用有經蝕刻之鋁材做陽極氧化並著色後，能使孔洞數目更多，著色膜之厚度會比未經蝕刻略微變薄，硬度與抗腐蝕性則比未經蝕刻好。反射率、△Eab、光澤度都比未經蝕刻鋁片者低。而粗糙度比未蝕刻鋁片者高。
使用15%鹽酸蝕刻45分鐘，在電流密度1A/dm2下陽極處理後，再使用交流電壓20V電解著色30分鐘，可得到最低的反射率，並具有耐蝕且高硬度之黑色氧化鋁膜。

關鍵字

電解著色 ； 陽極氧化 ； 化學蝕刻

並列摘要

The effect of the step of chemical etching before anodic oxidation on the properties of electrolytically colored anodic film on aluminium were investigated in this study. It is expected that the step of chemical etching before anodizing on aluminium can obtain a colored film with better absorptivity.
The experimental results show that the chemical etching step increase the number of pores of the colored film. If the chemical etching step is used, the thickness of the colored film would become thinner, and that the hardness would become larger, the anticorrosive property would effectively enhance. Besides, reflectivity, △Eab value and gloss of the colored film are lower than that without chemical etching. The roughness of the colored film are higher than that without chemical etching.
The optimal operating conditions for obtaining the blackest colored film with the lowest reflectivity are: chemical etching at HCl 15% for 45 min, and anodizing current density of 1A/dm2 for 30 min, and electrolytic coloring at voltage of 20VAC for 30 minutes. Therefore, the addition of chemical etching step in the anodizing process of aluminium is surely beneficial to the subsequent black colored treatment.

並列關鍵字

ELECTROLYTICALLY COLORED ； ANODIC TREATMENT ； CHEMICAL ETCHING

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