氟离子浓度对镁锂合金(LZ91)微弧阳极膜层影响之研究.PDF

氟離子濃度對鎂鋰合金(LZ91)微弧陽極膜層影響之研究 防蝕工程　第㆓十卷第㆔期　第249 〜254 頁　2006 年9 月 Journal of Chinese Corrosion Engineering, Vol. 20, No. 3, pp. 249~254 (2006) 氟離子濃度對鎂鋰合金 微弧陽極膜層 (LZ91) 影響之研究 1 2 3 4 5 程偉堃 、李九龍 、王建義 、張進龍 、葛明德* Effects of Fluorine Ion Concentration to Micro-Arc Anodic Films on Magnesium Lithium Alloys 1 .2 3 4 5 W. K. Chen , L. J. Long , J. Y. Wang , C. L. Chang , M. D. Ger* 鎂鋰合金(LZ91)可藉由微弧陽極處理的方式，於試片表面㆖形成陶瓷氧化層，使基材 提升抗蝕效能，本研究於於鍍液㆗添加不同濃度的氟化鈉，探討其氟離子濃度對陽極膜的 影響，由電化學交流阻抗(EIS)分析㆗發現，陽極過程㆗添氟離子有助於陽極膜的抗蝕能力， 但添加過高濃度的氟離子會使陽極膜的抗蝕性㆘降，於SEM 觀察㆗發現當氟化鈉濃度超過 15 g/L 時陽極膜會形成樹枝狀的鬆散性多孔結構，而降低陽極膜的抗蝕性能。 關鍵字：鎂鋰合金(LZ91) ；電化學交流阻抗分析儀(EIS) ；氟化鈉。 ABSTRACT In this research the advantage of micro-arc anodize forming ceramic oxide layer was taken to improve corrosion resistance of the magnesium lithium alloys. This study details the effect of sodium fluoride (NaF) concentration on the properties of anodic oxide films. Electrochemistry Impedance Spectroscopy (EIS) analysis discovers that adding more fluorine ion results in the coating having better corrosion resistance. The high fluorine ion concentration, however, will reduce corrosion resistance of the anodic films. When NaF concentration is over 15 gL-1, the coating formed comprised a porous dendrite microstructure in the