進而暴露原本覆蓋於其下未經腐蝕之鎂合金表面，導致阻抗值的下降。
再者，當浸泡時間延長至 36 小時，披覆有 PSICA 塗層之試樣均可觀察到明顯
的阻抗值下降。根據微結構觀察的結果，此一現象應是來自於 PSICA 塗層的分解，
導致其阻礙腐蝕因子擴散的能力下降所造成。配合微結構觀察與 EIS 分析，PSICA
塗層在腐蝕溶液中長時間浸泡之腐蝕行為，如圖 5.7 所示
圖 5.7 披覆 PSICA 塗層之 AZ31 鎂合金長時間
浸泡於腐蝕溶液之腐蝕行為示意圖
第 6 章 結論
本研究以檸檬酸鹽為主要反應物種，建立一環保無鉻且生物可相容之鎂合金
化成處理系統，並可於 AZ31 鎂合金表面形成一具有特徵蜂窩狀微結構且無脫水裂
紋的鈍化膜。綜合本研究的實驗結果，可作出以下幾點結論：
1. 以檸檬酸鈉為主要反應物種之鹼性檸檬酸鹽化成處理屬於氧化型化成處 理，透過檸檬酸鹽化成處理，可以提升 AZ31 鎂合金之抗蝕能力。
2. 添加硫酸根對於檸檬酸鹽鈍化膜之抗蝕能力具有負面影響，此影響在水 溶液系統中極為明顯，但在甘油溶液系統中其影響程度會受到抑制。
3. 添加銅離子在水基檸檬酸鹽化成處理中會於 AZ31 鎂合金表面沈積氧化 亞銅顆粒，但無法提升鈍化膜之抗蝕能力，而在甘油基化成處理中，銅
離子的添加則會沈積含有金屬銅的顆粒，可提升鈍化膜在電化學量測中
的抗蝕性質。
4. 以聚琥珀醯亞胺檸檬醯胺進行後處理，可有效提升 AZ31 鎂合金之抗蝕能 力。聚琥珀醯亞胺檸檬醯胺本身為生物可降解之材料，可搭配適當化成
處理製程，作為生醫用鎂合金表面處理之選擇。
第 7 章 未來研究方向
基於目前的研究結果，未來的研究方向大致可為兩大部分：第一部分是檸檬
酸化成處理製程之優化，第二部分則是聚琥珀醯亞胺檸檬醯胺後處理製程之調整
與改質。
在檸檬酸化成處理製程優化方面，檸檬酸化成處理為一氧化型化成處理，雖
然可製得無脫水裂紋且有明顯抗蝕能力之鈍化膜，但由於其具有特殊蜂窩狀顯微
結構，較難完整披覆整體表面。因此，可以嘗試加入其他反應物種搭配檸檬酸鹽，
嘗試提升鈍化膜之披覆完整性。
而在聚琥珀醯亞胺檸檬醯胺後處理製程方面，根據文獻報導，調整檸檬酸酯
與己二胺之比例，可以有效調整聚琥珀醯亞胺檸檬醯胺中琥珀醯亞胺結構單元與
檸檬醯胺結構單元之比例，故可嘗試藉由此種方式，是否可改善聚琥珀醯亞胺檸
檬醯胺本身之障蔽保護效果。此外聚琥珀醯亞胺檸檬醯胺具有錯合能力，因此可
嘗試在聚琥珀醯亞胺檸檬醯胺後處理製程中添加可被錯合之腐蝕抑制劑，測試是
否可使其在遭受腐蝕因子攻擊而破壞時，提供自我癒合的效果。
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