LZ91鎂鋰合金經微弧氧化處理後之耐磨耗特性

Wear Resistance of LZ91 Magnesium-Lithium Alloy by Micro-Arc Oxidation

翁郁淨(Yu-Ching Weng) ； 邱傳聖(Chuan-Sheng Chiou)

《南亞學報》 30期 (2010/12) Pp. 47-58

https://doi.org/10.6989/JN.201012.0047

摘要

由於鎂鋰合金的抗腐蝕性不理想，限制其應用範圍。本研究藉由微弧氧化處理對鎂鋰合金LZ91進行表面改質。調整雙極性脈衝電源形式及電解液成分，探討電流密度對塗層特性及耐磨耗性能的影響。結果顯示當電流密度提高時，塗層厚度逐漸下降，而重量逐漸上升，表面粗糙度和硬度值也逐漸增加。經由掃描式電子顯微鏡觀察其表面形貌後，發現隨電流密度上升表面孔洞數增多，斷面塗層緻密性提高，密度可達1.6g/cm^3。於線性磨擦試驗所獲結果，顯示磨耗損失主要受塗層硬度值影響。

關鍵字

鎂鋰合金 ； 微弧氧化處理 ； 磨耗 ； 腐蝕

並列摘要

Owing to the poor corrosion resistance of magnesium-lithium alloys, its application is restricted. The LZ91 Mg-Li alloy was surface modified by micro-arc oxidation. The effects of the form of bipolar pulse power and electrolyte on the coating and wear resistance characteristics were investigated. Results showed that the coating thickness decreased, coating weight and surface roughness and hardness increased with the increasing current density. The observation of surface morphology by scanning electron microscope revealed that the higher the current density the more amounts of surface holes. The coating density of cross section increased up to 1.6g/cm^3. The wear losses are mainly affected by the coating hardness in the linear friction tests.

並列關鍵字

Magnesium-Lithium alloys ； LZ91 ； Micro-arc Oxidation ； Wear ； Corrosion