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研究生:林筵進
研究生(外文):Yen-Chin Lee
論文名稱:不同塗層在乾濕循環環境中之電化學阻抗性質研究
論文名稱(外文):EIS of different coating in cycle test
指導教授:蔡文達蔡文達引用關係
指導教授(外文):Wen-Ta Tsai
學位類別:碩士
校院名稱:國立成功大學
系所名稱:材料科學及工程學系碩博士班
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:95
中文關鍵詞:塗層電化學阻抗乾濕循環環境
外文關鍵詞:coatingEIS
相關次數:
  • 被引用被引用:7
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  • 下載下載:173
  • 收藏至我的研究室書目清單書目收藏:1
摘 要
本實驗探討 Acrylic , Epoxy, PU等三種不同塗層塗覆於碳鋼表面時,在乾濕循環測試環境下,各塗層之退化機制。實驗中會經由OM, SEM,EDX,XRD, 及EIS之分析來觀察與鑑定試片之腐蝕生成物,進而推斷可能的腐蝕機制。此外,研究中亦進行鹽霧試驗,以作為評斷腐蝕機構之參考,並比較在乾濕循環環境下的腐蝕行為的差異性
由實驗結果發現,乾濕測試壓克力塗層的紅□與氣泡的分佈最多最廣,PU次之,環氧樹酯最少。經由EIS分析及等效電路模擬後可得知在乾濕循環測試環境下,其環氧樹酯有較高的電阻與較低的電容,表示溶液不易擴散至塗層中。然而壓克力塗層卻有較低的塗層電阻且電容值較高。表示溶液易擴散至塗層中,塗層會因溶液中的水與離子的破壞,造成塗膜的脫落現象。PU塗層會因乾濕循環中表面生成鋅氧化物,塗層阻抗值變化不大。並由塗層電容的變化與成分分析,得知溶液亦進入塗層之中。此外,Acrylic , Epoxy, PU等三種不同塗層在乾濕測試環境中,隨者厚度越大其保護性也就越佳。
Abstract
The corrosion behavior of acrylic, epoxy, PU coatings exposed to cyclic test and salt spray has been investigated by OM(optical microscopy), SEM(scanning electron microscopy), EDS (energy dispersion spectrometer),&EIS(electrochemical impedance spectroscopy).It is found that EIS measurements complement the result of the cyclic test and provide comparative quantitative data and valuable information on the coating degradation mechanism. In addition, the difference of corrosion protection of them in cyclic test and salt spray change.
The experiment results showed rusts and blisters on acrylic coating surface is the most in cyclic test. However, epoxy coatings surface in cyclic test have the least rusts and blisters .By EIS, epoxy coating have high coating resistance and low capacitance in cyclic test. But, acrylic coating have reverse tendency. It is mean that water and ion diffused acrylic coating is easier than epoxy coating. Then, the film of coating break down due to water and ion increasing in the coating; However, the surface of PU coating in cyclic coating produce zinc corrosion product. The resistance and capacitance of PU coating in cyclic test do not change more. And, solution has entered coating result from capacitance changed. Coating protected substance well when coating thickness is more and more.
總目錄
摘要…………………………………………………………..Ⅰ
Abstart……………………………………………………Ⅱ
總目錄………………………………………………………..Ⅲ
表目錄………………………………………………………..Ⅳ
圖目錄………………………………………………………..Ⅴ
第一章 前言………………………………………………… 1
1.1 簡介……………………………………………………………….…1
第二章 文獻回顧…………………………………………… 3
2.1防蝕塗料種類…………………………………………………….… 3
2.2 EIS在有機塗層的應用………………………………………...… 8
第三章 實驗步驟…………………..……….…….……….. 11
3.1實驗設計………………………………………………………...… 11
3.2實驗方法………………………………………………………...… 12
3.2.1模擬潮汐環境測試………………………………………….12
3.2.2試片性質測試………………………………………………… 12

3.2.3電化學特性評估……………………………………………..…13
3-2-3.1開路電位的量測…………………………………………. 13
3-2-3.2電化學阻抗分析…………………………………………. 13
3-2-4塗層表面分析……………………………………………….… 13
3-2-4.1 SEM微觀組織分析………………………………………. 13
3-2-4.2塗層表面腐蝕產物之晶體……………………………..… 13
3-2-5鹽霧測試……………………………………………………..…14
3-2-5.1實驗條件……………………………………………………. 14
3-2-5.2 鹽水噴霧測試……………………………………………. 14
第四章 結果與討論………………………………………..19
4.1碳鋼…………………………………………………………...……19
4.2壓克力樹酯…………………………………………………………21
4.3 環氧樹酯…………………………………………………………24
4.4 PU樹酯…………………………………………………………26
4.5鹽霧試驗…………………………………………………………30
4.6綜合評估……………………………………………………………31
第五章 結論……………………………………………………32

參考文獻………………………………………………..33
附錄一 ……………………………………………………. 37
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