臺灣博碩士論文加值系統

鋁合金為了防蝕常使用陽極處理或非鉻化成皮膜處理，在基材表面生成氧化層或磷酸鹽等皮膜，導電性降低容易引發電磁波干擾，本實驗以鋁陽極處理後所產生的多孔層吸附鎳離子，於氫氣氣氛下進行還原，具有催化活性的鎳，經由中性的無電鍍鎳硼鍍液析鍍無鎳硼鍍膜，再催化後續的無電鍍銅、鎳磷或鈷磷鍍層，製備單層或多層式複合層。在電磁波干擾遮蔽效率量測，頻率範圍為900~1900 MHz，以Co-P/Cu/Co-P/Cu/Ni-B/AAO/Al多層膜搭配最佳，厚度約1200 nm時，平均電磁波干擾遮蔽值可達62dB，在1900MHz時可達77.24 dB。由理論公式計算發現鍍膜以反射損失機構為主，吸收損失只能提供少許電磁波干擾遮蔽值。粗糙度分析以多層鍍膜最低，也間接影響電磁波遮蔽。耐蝕性測試發現由於不同金屬搭配的鍍層，容易引發加凡尼腐蝕，因此仍以單層鍍膜Ni-P/Ni-B/AAO/Al的耐蝕較佳。

Hydrogen reduction of absorbed nickel ions to nickel atoms on porous anodic aluminum oxide (AAO) . Electroless nickel-boron plating catalyzed by nickel atoms for the filling of porous AAO was performed. Further electroless nickel-phosphorus (Ni-P), copper (Cu), and/or cobalt-phosphorus (Co-P) platings were prepared for the electromagnetic interference(EMI) shielding and corrosion resistance tests. It has been shown that multi-layer coating with Co-P/Cu/Co-P/Cu/Ni-B/AAO/Al structure and total coating thickness 1200 nm possesses better EMI shielding effectiveness within the range from 900 to 1900 MHz.The average attenuation is about 62 dB.The EMI shielding effectiveness 77.24 dB can be obtained at 1900 MHz.Shielding effectiveness is mainly due to reflection of incoming electromagnetic radiation. The lower surface roughness prepared by the multi-layer coating influence EMI Shielding effectiveness indirectly. However, single-layer coating with structure of Ni-P/Ni-B/AAO/Al has better corrosion resistance based upon results of electrochemical analysis.

圖目錄.....................................VII
表目錄.....................................XIII
第一章 緒論 ..................................1
1-1前言.......................................1
1-2 電磁波遮蔽材料技術............................4
1-2-1金屬外殼................................4
1-2-2 表面金屬化外殼...........................4
1-2-3金屬填充塑膠複材外殼.......................5
1-2-4本質型導電高分子..........................6
1-3研究動機....................................7
1-4 研究目的....................................8
第二章 文獻回顧................................9
2-1陽極處理....................................9
2-1-1陽極處理原理.............................9
2-1-2陽極氧化膜結構與成長過程....................9
2-1-3陽極氧化膜形成機構........................11
2-1-3-1孔洞形成 ...........................11
2-1-3-2 穩定成長...........................13
2-1-4影響陽極處理因素.........................13
2-1-4-1操作電壓...........................13
2-1-4-2電解液溫度..........................14
2-1-4-3電解液種類..........................14
2-1-4-4鋁合金種類...............................15
2-1-5氧化鋁模板製作及應用......................16
2-2無電鍍.....................................18
2-2-1無電鍍原理..............................18
2-2-2無電鍍鎳...............................18
2-2-3無電鍍鈷...............................21
2-2-4無電鍍銅...............................21
2-3電磁波干擾遮蔽..............................23
2-3-1電磁波干擾遮蔽原理.......................23
2-3-2電磁波遮蔽材料...........................25
2-3-2-1導電填充物..........................25
2-3-2-2 鍍膜..............................27
2-3-3重要文獻回顧............................29
第三章 實驗步驟及方法.........................31
3-1實驗步驟...................................31
3-1-1前處理.................................31
3-1-2氧化鋁模板製作...........................31
3-1-3奈米多孔氧化鋁模板沈積鎳奈米金屬線...........33
3-1-4鍍膜...................................34
3-2儀器原理....................................37
3-2-1 掃描式電子顯微鏡.........................37
3-2-2低掠角X 光繞射儀.........................38
3-2-3頻譜分析儀..............................39
3-2-4 四點探針...............................40
3-2-5振動試樣磁力計...........................42
3-2-6掃描式探針顯微鏡.........................42
3-2-7 恆電位儀...............................43
第四章 結果與討論.............................45
4-1.前處理之影響................................45
4-1-1化學拋光...............................45
4-1-2退火處理...............................45
4-2處理電壓對氧化膜性質的變化.....................47
4-3奈米多孔氧化鋁模板沈積鎳奈米金屬線...............56
4-3-1氧化鋁模板吸附醋酸鎳經氫還原後之分析.........56
4-3-2鎳晶種經無電鍍鎳硼催化成長鎳奈米線分析........59
4-4鍍層分析.................................66
4-5鍍膜表面粗糙度分析.........................76
4-6厚度對導電性及磁性質影響.....................85
4-7電磁波干擾遮蔽分析...........................89
4-8厚度對耐蝕性影響............................105
第五章 結論.................................110
參考文獻....................................112

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