臺灣博碩士論文加值系統

本研究主要在探討不同鈍化處理方法及添加Na2MoO4對201不銹鋼鈍化及腐蝕行為的影響。實驗材料使用201高錳不銹鋼，經不同鈍化處理方法，並在部分鈍化溶液中添加Na2MoO4，而後藉由循環極化法及開路電位衰退量測評估其鈍化效果。搭配XPS表面成分分析，以釐清不同鈍化溶液及條件間，鈍化膜之化學組成的差異，進一步說明其對耐蝕性質的影響。此外以304不銹鋼作為實驗對照組，藉此探討合金含量鈍化及腐蝕行為中所扮演的角色。
鈍化後，根據在0.1 M HCl水溶液中的電化學實驗結果顯示，在室溫30 % HNO3鈍化溶液中，化學鈍化時間的增加，以及電化學施加電位的提升，皆有助於鈍化膜耐蝕能力的改善，201不銹鋼表現在Enp值的提升。另一方面在鈍化溶液中添加Na2MoO4後，雖然對304不銹鋼無明顯影響，但對於201不銹鋼來說其Enp值反而較無添加者下降，對於鈍化膜的耐蝕性質產生負面效果，根據XPS對鈍化膜Mo3d5軌域進行分析，發現鈍化膜中有MoO3存在，但並沒有發揮穩定鈍化膜的能力，而亦吸附於鈍化膜表面的MoO42-，可能為影響鈍化反應的因子。再者，將化學及電化學鈍化處後之耐蝕評估與XPS分析結果做比較，可發現經兩鈍化處理後，鈍化膜中Cr2O3及Fe2O3的含量分別增加，為進一步說明化學鈍化條件具有較佳的抗蝕能力。而在所有鈍化條件下，304不銹鋼之抗蝕能力皆優於201不銹鋼。雖然201不銹鋼經化學鈍化後，其鈍化電流密度可降至與304不銹鋼相同，但Enp提升的效果仍有限，由XPS分析及極化曲線結果做比較，發現原因在於化學鈍化可以提升鈍化膜中Cr/Fe氧化物比例，但在0.1M HCl水溶液中，Enp值仍會受到Mn、Ni及Mo氧化物含量所影響。

Passivation and corrosion behavior of high-manganese containing 201 stainless steel (SS) with different passivation treatments, in comparison with that of 304 SS, were studied. Both chemical passivation and electrochemical passivation were employed, while the passivation solution was HNO3 solution containing Na2MoO4. The corrosion performances of the passive films were evaluated by conducting cyclic potentiodynamic polarization and potential decay analyses in 0.1 M HCl solution. The experimental results showed that increasing chemical passivation time and electrochemical passivation potential, could improve the stability of passive film. Besides, all chemical passivation processes studied were superior to those of electrochemical passivation. Furthermore, a less notable decrease in the breakdown potential was observed if 201 SS was passivated in the electrolytes with 0.1 M Na2MoO4.

摘要 I
Extended Abstract III
致謝 X
總目錄 XI
表目錄 XIV
圖目錄 XVI

第一章 前言 1

第二章 文獻回顧及背景資料 3
2.1 不銹鋼腐蝕及防治 3
2.1.1 常見腐蝕形態與成因 3
2.1.2 表面防蝕處理 5
2.2 鈍化理論 6
2.2.1 鈍化簡介 6
2.2.2 鈍化膜成形機制 7
2.2.3 鈍化膜成長與崩解機構 8
2.2.4 鈍化膜研究方法 11
2.3 不銹鋼之鈍化性質 12
2.3.1 影響鈍化膜之因素 13
2.3.2 鈍化膜耐蝕性質 18

第三章 研究方法及步驟 28
3.1 實驗材料 28
3.2 鈍化處理 28
3.2.1 化學鈍化處理 29
3.2.2 電化學鈍化處理 29
3.3 鈍化膜耐蝕性質評估 30
3.3.1 動電位循環極化法 30
3.3.2 開路電位衰退法 31
3.4 鈍化膜組成分析 31

第四章 結果與討論 34
4.1 201及304不銹鋼於0.1 M HCl水溶液中的腐蝕行為 34
4.2 201及304不銹鋼於鈍化溶液中的電化學量測 35
4.3 鈍化膜穩定性評估 37
4.3.1 化學鈍化對201及304不銹鋼之鈍化及耐蝕性質影響 37
4.3.2 電化學鈍化對201及304不銹鋼之鈍化及耐蝕性質影響 39
4.3.3 比較化學及電化學鈍化處理對201及304不銹鋼之鈍化及耐蝕性質影響 40
4.3.4 添加Na2MoO4對201及304不銹鋼之鈍化及耐蝕性質影響 43
4.3.5 合金成分對不銹鋼之鈍化與耐蝕性質影響 44

第五章 結論 80

參考文獻 82

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