本研究乃是以硝酸鈍化法和熱氧化法在醫用級316LVM 不□鋼上長一層鈍化保護層，研究保護層之微結構與電化學性質，以應用在心血管擴張術的金屬支架材料。
在316L不□鋼上做硝酸鈍化前，表面需進行酸洗去除表面氧化雜物顆粒。此氧化雜物顆粒經由電子微探儀(EPMA)的X-ray mapping發現為由氧化鋁和氧化鈣所組成。為了有效去除此氧化雜物顆粒，本實驗根據氧化雜物顆粒組成改良酸洗步驟，並比較不同酸洗處理之後的效果。經極化曲線的量測發現，以高濃度的氫氟酸/硝酸混合液酸洗後，再加上檸檬酸的酸洗處理可以得到較好的酸洗效果。

除了需將氧化雜物顆粒去除外，硝酸的鈍化條件也相當重要。在本實驗中觀察到隨著鈍化溫度增加而崩潰電壓愈高。此外，經由熱氧化法所得到的鈍化膜，其崩潰電壓介在原始線材和經過硝酸鈍化之間，這表示硝酸鈍化法所得到的得到鈍化膜保護效果較熱氧化法佳。

若經過表面處理的線材鈍化膜崩潰電壓接近1 VSCE時，則在本實驗中定義為「完全鈍化」。研究發現，在低溫(60℃, 80℃)做硝酸鈍化處理的線材其完全鈍化的機率比在高溫下(96℃)要來得低。若表面的氧化雜物顆粒沒有完全去除，就算在高溫下做鈍化處理，其完全鈍化的機率約只有20%，若將氧化雜物顆粒完全去除後，則完全鈍化的機率將高達60%。這結果顯示，只有在將表面氧化雜物顆粒完去除後，非晶型氧化膜才能更有效的保護不□鋼線材。

為了研究鈍化膜的微觀結構、鍵結態和元素分佈，本實驗利用穿透式電子顯微鏡(TEM)、X光能譜儀(XPS or ESCA)和歐傑電子能譜儀(AES)進行分析。研究結果發現以硝酸鈍化法生成之鈍化膜為非晶型結構，表面主要的氧化物成份為氧化鉻(Cr2O3)、氫氧化鉻(CrOOH)，而經由熱氧化法所生成氧化膜和原始線材的氧化膜主要由氧化鐵(Fe2O3)和氧化鉻(Cr2O3)所組成。鈍化的機制和鈍化膜結構將在結論與討論中提出，並期望實驗結果可以做為評估金屬支架的理論基楚。

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