7075鋁合金經微弧氧化後表面染黑處理

Surface blackening on 7075 aluminum alloy by micro-arc oxidation

賴宗沂(Tzong-Yi, Lai)

指導教授 ： 邱傳聖

元智大學/工程學院/機械工程學系/碩士(2011年)

摘要

微弧氧化表面處理是一項與傳統表面處理截然不同的表面處理技術。現今多以輕金屬合金鋁、鎂、鈦為主要處理金屬，經微弧氧化過後的工件表面會生成一層陶瓷氧化膜，提升表面的各種材料特性。而一般表面處理後，表面染黑的程序需額外進行，而此步驟較費時。微弧氧化過後的陶瓷氧化層多為灰白色，本論文對7075鋁合金進行微弧氧化處理，為了使微弧氧化過後的表面陶瓷氧化層呈現黑色外觀，實驗用矽酸鹽中添加釩酸銨對於不同的處理時間討論試片黑化程度。其中作用時間達20分鐘時，用色度儀測出該作用時間的反射率可達5%以下，且用CIE. L*a*b* 測色標準測量出L*-value會隨作用時間的增加而下降。利用XRD、XPS、FTIR、SEM對表面進行觀測與分析，推論在添加釩酸銨後的溶液進行微弧氧化，隨著作用時間增加，試片表面所產生的V2O3含量增加，使試片表面膜層黑化，其黑化程度也隨著上升。

關鍵字

微弧氧化 ； 黑色陶瓷層 ； 7075鋁合金

並列摘要

Micro-arc oxidation is a new surface treatment technology. The aluminum, magnesium and titanium metal surface can produce a layer of ceramic oxide coating and enhance the material properties after micro-arc oxidation. After traditional surface treatment technology, surface blackening need one more time-consuming procedure. Most of the surface of ceramic oxide coating is white after micro-arc oxidation. In this paper, we will change the surface color of the material on 7075 aluminum alloy by micro-arc oxidation treatment. In order to make the micro-arc oxidation ceramic surface presents black appearance; we add ammonium metavanadate in silicate electrolyte and discussing the surface blackening of specimen in different time period. When time up to 20 minutes, the reflectivity is less than 5%. L*-value would decrease with the increase of production time. The characteristics of MAO coatings formed at different treatment time were detection and investigated by SEM,XRD, FTIR,XPS and color analysis instrument. The black ceramic layer containing V2O3 , content of V2O3 would enhance with the increase of production time. As the result, the surface color of specimen is more black.

並列關鍵字

Micro-arc Oxidation ； black ceramic ； 7075 aluminum alloy

參考文獻

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