不同製程參數對AA1050與AA5052陽極皮膜抗腐蝕能力的影響

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陳正義(Cheng-Yi Chen) 查詢紙本館藏

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論文名稱

不同製程參數對AA1050與AA5052陽極皮膜抗腐蝕能力的影響
(Influence of corrosion resistance of different processing parameters of AA1050 and AA5052 anodic films)

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摘要(中)

鋁中添加鎂元素可提高鋁合金機械性質，但也帶來了較多的介在物，因而降低抗腐蝕能力。本實驗中將AA1050H16 與AA5052H32 兩種材料施以不同陽極條件與封孔方式。封孔方式分別以熱水與醋酸鎳溶液進行封孔處理。電化拋處理亦為參數之一，其目的是用來比較電化拋對陽極皮膜品質與抗腐蝕能力的影響。
經由鹽霧試驗發現， AA5052H32 陽極皮膜的抗腐蝕能力比AA1050H16 的低，主要是由於(1)陽極皮膜裡含有MgO 與(2)基材內部
有較多的介在物顆粒的影響。陽極皮膜經由醋酸鎳溶液封孔後，皮膜內會有Ni(OH)2 的形成，故其抗腐蝕能力會高於使用熱水封孔。電化拋處理可顯著改善表面粗造度與提高陽極孔洞的排列規律，但試片表面的殘留層在陽極過程中會形成鋁氯化合物，因而降低陽極皮膜的抗腐蝕能力。
經鹽霧試驗後，使用熱水封孔的陽極試片（ AA1050H16）其色差值
會比使用醋酸鎳封孔的高。相反地，當陽極試片（ AA5052H32）使用熱水封孔時，其色差值會比較低。

摘要(英)

Magnesium added in aluminum can increase the strength of
aluminum alloy. But it also brings about inclusions in the matrix of aluminum alloy to decrease the corrosion resistance. This study used the materials of AA1050H16 and AA5052H32 as base metals to carry out anodization with different anodizing conditions and sealing processes.
Pre-treatment of electro-chemical polish (ECP) is also concerned and treated as variable to compare its effect on the amorphous anodization film (AAO) quality and corrosion resistance.
After salt water spraying test, we found that AAO film formed on AA5052H32 surface has a lower corrosion resistance than AA1050H16 that mainly affected by (1) forming MgO in AAO film and (2) high amount of inclusion particle existed in matrix. Experimental results also
point out that sealing AAO film by using nickel acetate can improve sample’s corrosion resistance due to the existence of nickel hydroxide on AAO film. Pre-treatment of ECP process smoothed the sample’surface and improved the regularity of anodized pore arrangement. The residues on surface tended to interact with oxygen to form complex products during anodization deteriorating the AAO film’s corrosion resistance.
Anodized samples (AA1050H16) sealed by hot water show a higher color difference than those sealed by nickel acetate solution. Contrarily, anodized samples (AA5052H32) show less degree of color difference after hot water sealing was used.

關鍵字(中)

★ 鹽霧試驗
★ 陽極處理
★ 電化拋處理
★ 抗腐蝕能力

關鍵字(英)

★ anodic treatment
★ electro-polishing
★ corrosion resistance
★ salt spray

論文目次

中文摘要.......................................................................................... i
英文摘要......................................................................................... ii
目錄............................................................................................... iii
圖目錄............................................................................................. v
表目錄............................................................................................ xi
符號說明....................................................................................... xii
第一章前言................................................................................. 1
第二章理論探討與文獻回顧........................................................ 2
2-1 鋁合金（實驗材料） ........................................................ 2
2-2 陽極處理.......................................................................... 2
2-2-1 基礎介紹................................................................. 2
2-2-2 陽極過程的電壓與時間關係.................................... 5
2-3 陽極處理的分類............................................................... 9
2-3-1 硫酸法.................................................................... 9
2-3-2 草酸法.................................................................... 9
2-3-3 鉻酸法.................................................................. 10
2-4 陽極皮膜的封孔............................................................. 10
2-4-1 熱水封孔................................................................11
2-4-2 鉻酸鹽封孔........................................................... 12
2-4-3 醋酸鎳封孔........................................................... 13
2-4-4 熱水封孔與含醋酸鎳成份溶液封孔差異................ 13
2-5 陽極皮膜檢測................................................................. 15
2-5-1 化學方法............................................................... 15
2-5-2 鹽霧試驗............................................................... 15
2-5-3 電化學方法........................................................... 16
2-5-4 光學檢測............................................................... 18
2-6 腐蝕............................................................................... 19
2-6-1 腐蝕廣泛的意義.................................................... 19
2-6-2 腐蝕的型態........................................................... 19
2-6-3 氯離子的角色........................................................ 21
2-6-4 氯離子腐蝕理論.................................................... 22
2-6-5 陽極皮膜的腐蝕.................................................... 28
第三章實驗方法與步驟............................................................. 30
3-1 實驗材料與試片準備...................................................... 30
3-2 實驗儀器........................................................................ 30
3-3 試片代號說明................................................................. 31
3-4 實驗步驟........................................................................ 34
第四章結果與討論.................................................................... 38
4-1 實驗材料的金相觀察...................................................... 38
4-2 陽極參數對陽極皮膜品質影響........................................ 42
4-2-1 電流密度與時間對陽極皮膜厚的影響.................... 42
4-2-2 陽極皮膜的二次離子質譜儀(SIMS)分析................ 43
4-2-3 電流密度對陽極孔洞率的影響............................... 47
4-2-4 電化拋對陽極皮膜品質的討論............................... 52
4-3 鹽霧試驗結果討論.......................................................... 55
4-4 光學CIE L*a*b*結果討論.............................................. 81
第五章結論............................................................................... 99
參考文獻...................................................................................... 100
附錄一.......................................................................................... 110

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指導教授

施登士(Teng-Shih Shih)

審核日期

2010-7-28

推文