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標題: 成長鋰鋁層狀氫氧化合物(Li-Al-CO3 LDH)透明薄膜於AZ31基材以及在稀薄氯化鈉濃度環境下該LDH薄膜提升抗腐蝕性質之研究
Corrosion resistance in a humid environment for magnesium alloy AZ31 coated by optically transparent Li-Al-CO3 hydrotalcite film
作者: 許家漢
Syu, Jia-Han
關鍵字: AZ31 鎂合金
AZ31 magnesium alloy
transparent film
high-humidity test
出版社: 材料科學與工程學系所
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摘要: 本研究在AZ31表面快速成長鋰鋁層狀氫氧化物(Li-Al-CO3 LDH)透明薄膜以及在低氯化鈉濃度及高濕度環境中測試此LDH薄膜抗腐蝕能力。AZ31(陰極)與不鏽鋼管(陽極)浸置於含有鋰離子及鋁離子的鹼性水溶液中,且於兩極之間施加直流電壓。上述製程於25 °C進行之。鋰鋁層狀氫氧化物透明薄膜由高密度的片狀氫氧化物組成,而且這些片狀物接近地垂直站立在AZ31基材表面。片狀氫氧化物在試片表面的緻密程度會隨著電壓提高而降低。通以3.2 V與 4 V的電壓進行表面處理時LDH薄膜無法成長於試片表面。因此在研究中以2伏特作為Li-Al-CO3 LDH穩定成長的電壓參數。Li-Al-CO3 LDH薄膜厚度隨著處理時間呈線性增加。實驗顯示在0.6 M 氯化鈉濃度中進行極化腐蝕測試,經表面處理3000秒之試片的平均腐蝕電位(Ecorr)為-1.518 VAg/AgCl及平均腐蝕電流密度(Icorr)為1.66 μA/cm2。900秒表面處理試片的Ecorr約為-1.525 VAg/AgCl、Icorr約為5.601 μA/cm2。上述結果均明顯優於AZ31基材(Ecorr ~-1.538VAg/AgCl, Icorr ~49.46μA/cm2)。相同極化測試在0.1 M氯化鈉溶液中,經表面處理900秒成長的化成薄膜與AZ31的腐蝕電流有一個級別的差距,前者具有較小的腐蝕電流密度與較高的腐蝕電位。本研究使用微小表面電極量測試片表面接觸腐蝕溶液(0.1 M NaCl與水) pH值變化。相較於AZ31之表面pH值在1分鐘內快速上升至pH約10.1,AZ31表面具有LDH的試片,pH值在10分鐘內緩慢上升。高濕度腐蝕長期測試結果:經300秒表面處理的試片經過48小時腐蝕測試後,進行紅外線光譜儀分析發現H2O-CO3鍵的訊號消失及Al-OH鍵的訊號降低。相對於表面處理900秒的試片,在長達96小時腐蝕測試後仍保有LDH皮膜鍵結訊號。在高濕度低鹽度的腐蝕環境下,此皮膜層的疏水性質及較厚的Li-Al-CO3 LDH皮膜厚度來共同提升抗腐蝕的能力。
An optically-transparent Li-Al-CO3 hydrotalcite (Li-Al-CO3 LDH) film directly formed on AZ31 substrate by applying a DC voltage (V DC) between cathode (AZ31) and anode (stainless steel) in a Li+/Al3+ aqueous solution. Two V DC was the optimum voltage required to have a uniform Li-Al-CO3 LDH film on AZ31 Mg sample after performing electrolysis experiments. Under the same 2V DC voltage during electrolysis, the thickness of the LDH film on AZ31 linearly increased with electrolysis time. The LDH film was optically-transparent. For instance, the LDH film after 900 sec electrolysis had a better optical transparency than that after 1800 sec or 3000 sec electrolysis. Hydrogen was bubbling on AZ31 surface at applied voltages larger than 2 V DC. Thus, LDH film was unable to grow on AZ31 sample surface when 3.2 V DC and 4 V DC were used. Polarization measurements were performed in 0.1 M and 0.6 M NaCl solutions. The 3000s-coated sample that tested in 0.6 M NaCl solution had average values of corrosion potential (Ecorr) ~-1.518 VAg/AgCl and corrosion current density (Icorr) ~1.66 μA/cm2. The 900s-coated sample had values of Ecorr ~-1.525 VAg/AgCl and Icorr ~5.601 μA/cm2. Above results were much better than raw AZ31 substrate (Ecorr ~-1.538 VAg/AgCl and Icorr ~49.46 μA/cm2). Surfacial pH on AZ31 substrate rised rapidly to pH~10.1 in 1 min. For comparison, the surfacial pH on LDH-coated sample slowly increased to pH ~9.5 in 10 min. FTIR results showed that the main chemical bonds H2O-CO32- and Al-OH in LDH structure dissociated, leading to sufacial pH gradually increasing to a relatively higher level. Owing to the following effects: alkaline environment developed by LDH itself, the hydrophobicity and the thicker thickness LDH coating on AZ31 Mg alloy surface exhibited good corrosion resistance.
其他識別: U0005-0708201215402200
Appears in Collections:材料科學與工程學系



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