臺灣博碩士論文加值系統

本研究藉由無電鍍法，在AA7075鋁合金原基材經表面陽極處理，沉積無電鍍Ni-P-Cu複合鍍層，分析鍍膜的結構與機械性質，並探討無電鍍Ni-P-Cu複合鍍層在經過熱處理實驗後對AA7075鋁合金在3.5%NaCl水溶液中應力腐蝕破壞的影響。
實驗中使用AA7075鋁合金原基材經陽極處理、無電鍍鎳磷、無電鍍鎳磷銅複合鍍層，以及熱處理實驗後經慢應變速率拉伸(SSRT)在3.5%NaCl溶液中應力腐蝕破壞試驗。本實驗利用掃描式電子顯微鏡（SEM）及X光能量散射分析儀(SEM-EDS)，觀察鍍膜表面的形態、鍍層的元素成份分析。，並進行電化學動態極化法分析試驗。
研究結果顯示AA7075鋁合金試片表面經陽極處理後硬度值增加，其無電鍍鎳磷複合鍍層能有效的增加鍍層表面晶粒均勻附著。
另外無電鍍Ni-P複合鍍層，經由適當的陽極處理將能有效提升沉積效率、光滑度、緻密性與附著性，因而對於AA7075鋁合金經陽極表面處理後在3.5%NaCl水溶液中之耐應力腐蝕破壞有顯著的改進效果。

This study used electroless plating process to prepare Ni-P-Cu composite coating on AA7075 aluminum alloy surface after anodizing treatment.
The Stress-Corrosion Cracking (SCC) charactenrstics for the coating in 3.5%NaCl aqueous solution via slow strain rate test was also studied.
The surface morphology, element composition and surface hardness of the coatings were analyzed by SEM, EDS and Vicker’s hardness tester.
The corrosion and wear-corrosion resistance of electrolessplating Ni-P-Cu composite coating in 3.5% NaCl aqueous solution was evaluated, and also analyzed by electrochemical polarization measurement.
Experimental results indicated that electrolessplating Ni-P-Cu composite coating has high hardness, good corrosion resistance, particularly owing to the anodizing treatment of aluminum alloy. The anodizing treatment of AA7075 aluminum alloy substrate efficiently improved the adhesion, surface morphology and hardness of the electroplated Ni-P-Cu composite coating.
The results also indicated that the anti-SCC of the coating is potentiodynamic polarization significantly increased in 3.5% NaCl aqueous solution.

中文摘要……………………………………………………………………………i
英文摘要……………………………………………………………………………ii
誌謝……………………………………………………………………………iii
目錄……………………………………………………………………………iv
表目錄……………………………………………………………………………vi
圖目錄……………………………………………………………………………vii
符號說明……………………………………………………………………………ix
第一章 緒論…………………………………………………………………………… 1
第二章 理論基礎……………………………………………………………………… 2
2.1鋁及鋁合金………………………………………………………………… 3
2.1.1鋁的耐蝕表面處理…………………………………………………… 5
2.1.2鋁陽極處理氧化層…………………………………………………… 6
2.1.3電解拋光或化學拋光………………………………………………… 8
2.2無電鍍鎳磷簡介…………………………………………………………… 9
2.3無電鍍原理………………………………………………………………… 11
2.4腐蝕的定義………………………………………………………………… 14
2.4.1腐蝕電化學原理……………………………………………………… 14
2.4.2腐蝕的種類…………………………………………………………… 15
2.5電化學量測………………………………………………………………… 19
2.5.1極化原理……………………………………………………………… 19
2.5.2混合電位原理………………………………………………………… 21
第三章 實驗方法…………………………………………………………… 23
3.1無電鍍鎳-複合無電鍍鎳硫酸銅鍍膜……………………………… 24
3.1.1 基材試片成分………………………………………………………… 24
3.1.2試片前處理步驟……………………………………………………… 24
3.1.3電化學及摩耗測試試片……………………………………………… 33
3.2實驗步驟…………………………………………………………………… 34
3.3薄膜表面微結構觀察……………………………………………………… 35
3.4電化學腐蝕試驗…………………………………………………………… 36
第四章 結果與討論……………………………………………………………38
4.1鍍膜表面微結構與機械性質分析………………………………………… 38
4.1.1鍍膜表面微結構……………………………………………………… 38
4.1.2鍍膜表面元素分析…………………………………………………… 45
4.1.3無電鍍鎳Ni-P鍍膜沉積微結構與元素分析………………………… 47
4.2電化學腐蝕分析…………………………………………………………… 48
4.3應力腐蝕實驗……………………………………………………………… 58
第五章 結論………………………………………………………………… 71
參考文獻…………………………………………………………………… 72

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