鋁材於添加不同種類有機酸於硫酸電解液中 陽極處理後電解著色

Electrolytic Coloring of Aluminum after Anodizing in Sulfuric Acid Solution with the Addition of Different Organic Acid

王婷婷(Ting-Ting Wang)

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

本研究在探討添加不同種類的有機酸於硫酸溶液中對氧化膜物性之影響，期望利用添加有機酸能獲得更好的氧化鋁膜，以利於進行電解著色。
實驗結果發現，添加檸檬酸及丙二酸進行陽極處理後著色，氧化膜之厚度會比未添加略微變厚，是由於檸檬酸及丙二酸會減緩膜的溶解。而添加三種有機酸所生成的氧化膜，硬度皆比未添加高。由SEM圖得知，添加有機酸使氧化膜表面孔洞較多也較小，整體氧化膜變得更緻密，因此生成的氧化皮膜經電解著色後，△E值及光澤度都比未添加的來的低。而腐蝕試驗證實，添加有機酸能有效提升氧化鋁膜的抗腐蝕性，改善著色後黑色皮膜之特性。
在陽極處理電流密度2A/dm2下，添加檸檬酸60g/L，陽極處理30分鐘，電解著色交流電電壓25V，電解著色30分鐘，可得最低之△E值、反射率及光澤度，其值分別為8.5、6.13%、6.25，確實改善黑色氧化鋁膜性質。

關鍵字

添加有機酸 ； 電解著色

並列摘要

The effects of the addition of organic acid in an anodizing electrolyte on the properties of aluminum oxide film were investigated in this study. It is expected that the additions of organic acid in electrolytic can obtain better anodic film and colored film.
The experimental results show that the additions of citric acid and malonic acid would increase the thickness of anodic film. This can be attributed to the fact that citric acid and malonic acid could reduce the dissolution of anodic film. Additions of organic acid could also increase the hardness. From SEM images, additions of organic acid could lead to more and smaller pores on anodic coatings. The anodic film become dense, therefore, after electrolytic coloring, the △E value and gloss become lower. From corrosion test, addition of organic acid could increase the corrosion resistance and improve the properties of anodic film after electrolytic coloring.
The optimal operating conditions for obtaining a black colored film are: anodizing current density 2A/dm2, 60g/L of citric acid, anodizing time 30 minutes, alternating current voltage of electrolytic coloring 25V and electrolytic coloring time 30 minutes, the lower △E value, reflectivity, gloss and corrosion rate would be obtained. Those values are respectively 8.5, 6.13%, 6.25 and 2.9053E-11 Amp/cm2. The addition of organic acid into electrolytic anodizing solution is surely beneficial to the subsequent black colored treatment.

並列關鍵字

addition of Organic acid ； electrolytic coloring

參考文獻

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