鎂鋁合金不僅擁有高比強度，相較於其他系列鎂合金更具有高強度、易鑄造 性及優良的抗蝕性等優點，若能解決鎂合金於應用環境中易發生腐蝕之缺點，則 鎂鋁合金未來勢必成為輕金屬中的應用主流，因此本研究改良錳酸鹽化成系統並 應用於 AZ91D 鎂合金之上，證實添加氟離子可有效增進化成系統之穩定性，並在 化成時傾向於α相上形成較多之氟化鎂而減少雙相間之活性差距，因此抑制雙相 伽凡尼效應，使得化成皮膜形成均勻，此外緻密氟化鎂生成亦可改進化成皮膜結 構，最後得到整體均勻、薄、緻密且幾乎無脫水裂紋之錳酸鹽化成皮膜，顯著提 升 AZ91D 之抗蝕性。然而，由於皮膜中仍具有氫氧化鎂之組成，且皮膜厚度相當 之薄，皮膜抗蝕性仍然受到限制，故若未來想進一步提升皮膜抗蝕性則可由下列 五點出發:
1. 將化成溶液之 pH 值調低，使化成時有較多之鎂溶出可持續驅動化成皮膜沉積，
應可增加化成皮膜之厚度而提升抗蝕性。
2. 將化成處理之溫度調升，使化成皮膜沉積之反應速率增快，亦應可增加化成 皮膜之厚度而提升抗蝕性。
3. 調升化成溶液中之過錳酸根與二價錳之濃度，同樣可增加化成皮膜沉積之速 率與反應量，應可增加化成皮膜之厚度而提升抗蝕性。
4. 若經由以上方法增加化成皮膜之厚度而提升抗蝕性，則可進一步調升化成溶 液中之氟離子含量，因化成皮膜較厚較不易因β相受到氟離子蝕刻而產生缺 陷，故較多之氟化鎂生成應可使化成皮膜結構更為緻密，提升皮膜抗蝕性。
5. 除增加皮膜厚度及增加氟化鎂含量之方法外，因本研究發現添加磷酸根可緩 衝化成時之β相上 pH 值上升，使β相上為與過錳酸根氧化還原形成緻密氧化 鋁層而鈍化，又添加氟離子可使α相上形成較多之氟化鎂而鈍化，故若同時 添加磷酸根與氟離子，則有可能形成雙相皆被良好鈍化之化成皮膜，可大幅 提升抗蝕性。
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