7075鋁合金經微弧氧化處理後之耐磨耗特性

Wear Resistance of 7075 Aluminum Alloy by Micro-Arc Oxidation

陳文杰(Wen-Chieh Chen) ； 邱傳聖(Chuan-Sheng Chiou)

《南亞學報》 29期 (2009/12) Pp. 35-47

https://doi.org/10.6989/JN.200912.0035

摘要

微弧氧化處理為現今表面改質新興技術之一，其技術特點為在試件表面長出一氧化膜，進而提升本身硬度及改變基材之材料特性。有許多複雜的因素會影響微弧氧化處理後的氧化膜特性。本篇論文將討論，微弧氧化處理應用在鋁合金7075之上，主要供應電源形式為雙極脈衝方式，控制雙極電流密度進一步探討膜層特性與耐磨耗特性之間的關係。利用掃描式電子顯微鏡觀察不同的雙極電流密度，對於其顯微結構之影響。實驗結果表示，當雙極電流密度愈趨增加時，其表面之多孔層孔洞直徑大小也隨之增大。以PLINT磨耗試驗機進行block-on-roller式磨耗測試，於電流密度1412 A/dm^2及1414 A/dm^2時，其膜層硬度值為840HV，遠大於鋁合金之硬度，於耐磨耗之特性也有所增強。

關鍵字

微弧氧化 ； 磨耗 ； 電流密度

並列摘要

The aluminum ceramic coatings were prepared on 7075 Al alloy by Micro-arc Oxidation (MAO) technique. Parameters of the MAO coating process is multiplex. In this paper, we used the bipolar pulsed current, and changed the positive and negative current density during the coating process. After the coating, we observed the surface morphology in SEM (Scanning Electron Microscopy) and discussed the mechanical property for coating Al alloy. The wear properties is tested by PLINT block-on-roller. The results show that the micro-hardness of the polished MAO process coating is 840 Hv, and the wear properties increased. This indicates that the optimum current density could afford good mechanical properties to MAO coatings in aluminum alloys.

並列關鍵字

Micro-arc Oxidation ； wear ； current density ； bipolar pulse