鋁材高溫預浸置後三成分混酸陽極處理

THE STUDY OF ANODIC TREATMENT OF ALUMINUM IN TERTIARY MIXED ACID AFTER HIGH TEMPERATURE PRE-IMMERSING

唐錦文(Ching-Wen Tang)

指導教授 ： 施幸祥

大同大學/工程學院/化學工程學系所/碩士(2005年)

摘要

本研究主要的目的是將鋁材先以鉬酸銨和氟化銨混合液高溫預浸置後，再於三成分混酸電解液中陽極處理。探討預浸置及不同陽極處理條件對鋁陽極氧化皮膜的影響。結果發現此經高溫預浸置之步驟和以三成分混酸為電解液皆可大幅提昇氧化鋁膜的膜厚及硬度。但若就提升的程度而言，經高溫預浸置之步驟對硬度的提升較大，而以三成分混酸為電解液對膜厚的影響較大。
先經預浸置後再以三成分混酸陽極處理的氧化膜，由SEM圖形可看見孔洞排列較整齊且均勻；由EDS分析可以得知陽極氧化膜中含有鉬原子；由溶膜試驗中發現它也有較好的抗蝕性。
本研究發現以80℃高溫預浸置後，再以三成分混酸(10g/L硼酸+5g/L硝酸+150g/L硫酸)為電解液，在溫度10℃、電流密度5A/dm2、陽極處理40分鐘後，可以得到最佳硬度692Hv，膜厚為78μm的陽極氧化膜。

關鍵字

預浸置 ； 三成分混酸 ； 陽極處理

並列摘要

The main purpose of this study is to investigate the effects of pre-immersing and different anodic treatment conditions on the oxidizing films on aluminum by first carrying out the high-temperature pre-immersing with mixed solutions of ammonium molybdate and ammonium fluoride and then the anodic treatment in the mixed acid of three components. From the results, it is discovered that first carrying out the high-temperature pre-immersing and then the anodic treatment and using the tertiary mixed acids as the electrolytic solution can both greatly increase the film-thickness and rigidity of the oxidizing aluminum films. However, concerning the degrees and magnitudes of these increases, first high-temperature pre-immersing and then anodic treatment result in greater increases is rigidities and using the tertiary mixed acids as electrolytic solutions produce greater effects to film thickness.
As for the oxidizing films obtained by first carrying out the pre-immersing and then the anodic treatment in tertiary mixed acids, from the SEM diagrams, it can be observed that the arrangements are more uniform and homogeneous; besides, from the EDS analysis, it can be known that the anodic oxidizing films contain molybdenum atoms; furthermore, in the film dissolution test, it can be discovered that they have better anti-corrosion properties.
The results of this study show that after carrying out the 80℃ high temperature pre-immersing and then using the tertiary mixed acids (10g/L of boric acid, 5g/L of phosphoric acid and 150g/L of sulfuric acid) as the electrolytic solutions and performing the anodic treatment under the condition of the temperature of 10℃, current density of 5A/dm2, for 40min, anodic oxidizing film of best hardness of 692Hv and film thickness of 78μm can be obtained.

並列關鍵字

anodic treatment ； pre-immersing ； tertiary mixed acid

參考文獻

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