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研究生:謝衛慶
研究生(外文):Wei-Ching Hsieh
論文名稱:化學鍍方法製備鎳鈷磷合金及其特性之研究
論文名稱(外文):Fabrication of Electroless Ni-Co-P Alloys and Their Characteristics
指導教授:陳炳宏陳炳宏引用關係
指導教授(外文):Bing-Hung Chen
學位類別:碩士
校院名稱:國立成功大學
系所名稱:化學工程學系碩博士班
學門:工程學門
學類:化學工程學類
論文種類:學術論文
論文出版年:2008
畢業學年度:96
語文別:中文
論文頁數:118
中文關鍵詞:無電鍍鎳鈷磷合金磁性抗腐蝕性表面形態XRD
外文關鍵詞:anticorrosive capabilityX-ray diffractionsurface morphologyNi-Co-P alloymagnetismelectroless deposition
相關次數:
  • 被引用被引用:6
  • 點閱點閱:416
  • 評分評分:
  • 下載下載:56
  • 收藏至我的研究室書目清單書目收藏:0
在本研究中,我們利用無電鍍方法成功地於基板上沉積鎳鈷磷合金。在本實驗的鍍浴基本配方中,使用了硫酸鎳與硫酸鈷作為金屬來源,次磷酸鈉作為還原劑,並添加錯合劑、穩定劑、pH緩衝劑、界面活性劑等化學藥品,以增加鍍浴的穩定性及實用性;此外,本實驗均於鹼性環境中進行反應,以確保金屬離子都可以成功地還原析出。
接著我們分別改變鍍浴中各種藥品的劑量及反應條件,觀察這些操縱變因對於析鍍速率、表面形態、鍍層的組成等結果之影響。就本實驗而言,其析鍍速率通常介於7 ~ 8 μm/hr之間,此時所獲得之鍍層表面最為平整光亮;提高鍍浴pH值或改變其它藥品劑量,析鍍速率最大可達13 μm/hr,但是鍍浴相對地不安定,且鍍層表面變得較為粗糙。
在鍍層之磁性與抗腐蝕性方面,我們改變次磷酸鈉、檸檬酸鈉、鎢酸鈉濃度及鈷離子比例等變因,來加以探討其影響。在這幾個變因中,就屬鈷離子比例對於鍍層的磁性影響最為顯著。本實驗中,Ni-P合金的磁性明顯低於Ni-Co-P合金;而檸檬酸鈉濃度因為會直接影響鍍層中的P wt.%,故對於鍍層的磁性之影響亦甚鉅。
抗腐蝕性能測試部分,則選用了三種腐蝕溶液。改變鈷離子比例在三種溶液中所測得之結果不盡相同,其它三者變因則有較具規則之變化。此處我們還發現鍍層之抗腐蝕性不僅受P wt.%的影響,而且W也具有相當程度之影響力。另外,最後我們尚利用XPS來檢測鍍層在經過抗腐蝕測試後,其表面生成何種氧化物質,並且將其結果與以EDS分析所得之結果作一比較。
Characteristics and deposition conditions of magnetic coatings of Ni-Co-P ternary alloys on brass substrates deposited by electroless deposition were investigated with an aid of various instruments, including SEM, EDS, XRD, SQUID, XPS, nanoindentor and potentiostat. Nickel sulfate and cobalt sulfate were formulated in the plating bath as main source of metal ions, along with sodium hypophosphite and sodium citrate as reductant and complexing agents, respectively. In some experiments, tungstate anions were involved in plating baths as stabilizers. Plating rates near ca. 7 ~ 8 μm/hr with good surface morphology were attained, though, in some cases, the deposition rate could get as high as 13 μm/hr. However, the morphology of magnetic films with such as high deposition rate is quite rugged. Among various plating parameters, such as concentrations of reductant and complexing agents, it was found that ratio of initial concentrations of metal ions present in plating formulation has profound influence on magnetism, anticorrosive properties, and Young’s moduli of resulted coatings. Furthermore, the anticorrosive properties of resulted magnetic coatings were not affected by the phosphorus content present in deposit only, but also trace contents of tungsten that was co-deposited in the plating process.
摘要 I
Abstract II
誌謝 III
目錄 IV
表目錄 VI
圖目錄 VII
第一章 緒論 1
第二章 簡介及原理 6
§ 2-1 化學鍍(無電鍍)之發展 6
§ 2-2 無電鍍之簡介 6
§ 2-3 無電鍍Ni-P反應機制之探討 7
§ 2-4 無電鍍Ni-Co-P合金 11
§ 2-5 磁學基本理論 16
§ 2-5-1 物質磁性的成因 16
§ 2-5-2 磁學的基本觀念 17
§ 2-5-3 磁性物質的分類 18
§ 2-5-4 鐵磁性體的磁滯現象 22
§ 2-6 腐蝕現象(Corrosion) 28
§ 2-6-1 腐蝕的定義 28
§ 2-6-2 極化現象 28
§ 2-6-3 腐蝕電位與腐蝕電流 29
§ 2-6-4 影響腐蝕發生及其速率的因素 31
第三章 實驗 35
§ 3-1 實驗藥品 35
§ 3-2 實驗儀器 36
§ 3-3 實驗步驟 36
第四章 結果與討論 40
§ 4-1 無電鍍浴成分與反應條件的影響 41
§ 4-1-1 穩定劑的功用 41
§ 4-1-2 界面活性劑的效用 42
§ 4-1-3 還原劑-次磷酸鈉的影響 43
§ 4-1-4 錯合劑-檸檬酸鈉的影響 44
§ 4-1-5 第三種金屬離子之來源-鎢酸鈉濃度之影響 46
§ 4-1-6 鍍浴中鈷離子初始比例的影響 47
§ 4-1-7 鍍浴pH值的影響 48
§ 4-1-8 pH緩衝劑-硫酸銨的影響 49
§ 4-1-9 鍍浴溫度之影響 50
§ 4-1-10 析鍍時間長短對於析鍍速率之影響 51
§ 4-2 鎳鈷磷合金之磁性 65
§ 4-2-1 錯合劑-檸檬酸鈉的影響 65
§ 4-2-2 次磷酸鈉的影響 67
§ 4-2-3 鈷離子初始比例的影響 69
§ 4-2-4 鎢酸鈉濃度的影響 70
§ 4-3 鎳鈷磷合金之抗腐蝕測試 81
§ 4-3-1 鈷離子初始比例的影響 82
§ 4-3-2 鎢酸鈉濃度的影響 84
§ 4-3-3 次磷酸鈉濃度的影響 86
§ 4-3-4 檸檬酸鈉濃度的影響 88
§ 4-3-5 以XPS分析鍍層表面的金屬氧化態 90
§ 4-4 鎳鈷磷合金之機械性質 110
第五章 結論 112
§ 5-1 影響無電鍍鎳鈷磷反應的因素 112
§ 5-2 無電鍍鎳鈷磷的磁性 113
§ 5-3 無電鍍鎳鈷磷的抗腐蝕性 114
§ 5-4 腐蝕後之表面組成 114
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