臺灣博碩士論文加值系統

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

1.E. Mattsson, Basic Corrosion Technology for Scientist and Engineers, p.13, Ellis horwoods, Chichester, UK, 1989.2.G. Wangle, An Introduction to Corrosion and Protention of Metal , Chapman and Hall , London ,p1, 1985.3.餘承聖,吳覺宇,魏豊義，鋼鐵材料之腐蝕與防蝕，鋼鐵材料，p.369，1998.4.柯賢文，腐蝕環境，腐蝕及其防制，p.197，1998.5.K. Barton, Protection Against Atompspheric Corrosion Mechanisms, p.165, Marcel Dekker, New York, 1987.6.H. E. Townsend, L. Allegra, R. J. Dutton, and S. A. Kriner, Materials Performance, Vol. 25, No. 8, p. 36, 1986.7.W. Funke, in R. A. Dickie and F. L. Floyd(eds.), American Chemical Society Symposium, USA, p. 222, 1986.8.ASTM B117-97 Standard Practice for Operating Salt Spray (Fog) Apparatus.9.ASTM D4541-95 Standard Test Method for Pull-Off Strength of Coatings Using Portable Adhesion.10.ASTM D3359 Standard Method for Measuring Adhesion by Tape Test 11.ASTM D610-01 Standard for Evaluating Degree of Rusting on Painted Steel Surface.12.ASTM D1654-76 Standard Test Method for Evaluation of Paints or Coated Specimens of paints or Coated Specimens Subjected to Corrosive.13.ASTM D714-87 Standard for Evaluating Degree of Blistering of Paint.14.ASTM D3363-00 Standard Test for Film Hardness by Pencil Test.15.ASTM D2803-93 Standard Guide for Testing Filiform Corrosion Resistance of Organic Coatings on Metal.16.ASTM D2616-96 Standard Test Method for Evaluation of Visual Color Difference With a Gray Scale.17.ASTM D870-97 Standard Practice for Testing Water Resistance of Coatings Using Water Immersion.18.賴耿陽，環氧樹酯應用實務，復興出版社，1993.19.陳劉旺,童欽文，塗料與塗料概要，塗料製造化學，p7,199320.陳劉旺，塗料概論，工業塗料與高分子化學，p1，1997.21.D. M. Brasher, and A. H. Kingsbury, Journal of Applied chemistry, Vol. 4 , p. 62, 1954.22.F. Mansfeld, and M. W. Kending , ASTM STP, p866, 1985.23.E. Frechette, C. Comere, and E. Gnali, Evaluation of the Corrosion Resistance of Painted Steel by Impedance Measurements.24.A.Ferraz, E. Cavalcanti, and A. R. Disari, Corrosion Science, Vol.37,p1267,1995.25.Lin, Nguyen, E. Macknight, Progress in Organic Coating, Vol.20, p169, 199226.J. R. Scully, S. T. Hensley, Corrosion, p705, 199427.V. B. Miskovic Stankovic, D. M. Drazic, and Z. K. Popovix, Corrosion Science, Vol.38, p1513, 1996.28.J G. W. Walter, Journal of Electricoanalyze Chemistry, Vol188, p259, 1981. 29.S. Haruyama, M. Asari, T. Tsuru , , the Electrochemical Society, USA, p.137, 1989.30.D. Kellner, ASTM, Pliadelphia, p.374, 1986.31.H. Leidheiser, Corrosion, Vol.39, p189, 1983.32.F. Mansfeld, S.Lin, C. Chen, H. Shin, Journal of Electrochemistry Society , Vol1.35, p906, 1988. 33.J. D. Scantlebury, and G. M. Sussex, Corrosion Protect by Organic Coatings , Manchester, England , p81 , 1989.34.M. Mcintyre, Ha. Q. Pham, Progress in Organic Coating, Vol.27, p201, 1996.35.Juttner, Electrochimica Acta, Vol.35, No. 10, p1501, 1990.36.J. R. Macdonald, Journal of Chemical Physical, Vol.23, pp275, 1955.37.N. Camaipni, G. Casalbore-Miceli, and A. Martelli, and M. J. Yang, Joural of Applied Electrochemistry , Vol. 27, p862, 1997.38.A.Amirudin, and D. Thierry, Progress in Organic Coatings, Vol. 26, p1, 1995.39.M. Keddam, O. R. Mattos, H. J. Takenouti, Journal of Electrochemistry Society. , vol.128, p257,1981 40.M. Pourbaix, Atlas of Electrochemical Equilibrium in Aqueous Solution , NACE, Houston, 1974.41.C. G. Munger, Corrosion Prevention Coatings, NACE, 198442.J. Ross Macdonald, and W. B. Johnson, Corrosion Mechanism, p271, 1987.43.S. Chechirlian, P. Eichner , M. Keddam, H. Takenouti, and H. Mazille, Electrochimica Acta, Vol. 35, No.7, p1125, 1990.44.S. E. Faidi, and J. D. Scantlebury, Journal of Electrochemical Society, Vol.136, No.4, p990,1989.45.W. Fisher, Progress in Organic Coating, Vol.22, p 181, 1993.46.F. J. Boerio, and D. J. Ondrus, Journal of Collid and Interface Science, Vol.139, p446, 1990. 47.K. Wongkamolsesh, Journal of Adhesion, Vol.1, p30, 1989.48.J. D. Venables, Journal of Material Science, Vol.19, p2431, 1984. 49.T. Nhuren, E. Byrd , and A.Taso, Journal of Applied Polymer Science, Vol.139, p446, 1990. 50.J. M. Black, and R. F. blomquit, Industry and Engineering Chemistry , Vol. 50, p918, 1958. 51.K. M. Yin, and H. Z. Wu, Surface & Coatings Technology, p.167, 1998.52.S. Krause, C. J. Mcneil., and R. D. Armstrong , W. O. Ho, Journal of Applied Electrochemistry, Vol.37, p1267, 1995.53.N. Kouloubmb, G. M. Tsangaris, and A. Skordos, Organic Coating, Vol. 28, p117, 1996.54.M. R. Horner, and F. J. Boerio, J. Adhesion, Vol.32, p141, 1990.