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研究生:鍾宜倫
研究生(外文):Yi-Lun Chung
論文名稱:熱熔射噴塗製備多孔結構防蝕吸音鍍層之開發
論文名稱(外文):Developments of using thermal spray technique to fabrication with corrosion resistibility porous structure and coating of acoustic absorption
指導教授:楊永欽楊永欽引用關係
指導教授(外文):Yung-Chin Yang
口試委員:黃清哲蘇程裕
口試日期:2016-06-30
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:材料科學與工程研究所
學門:工程學門
學類:材料工程學類
論文種類:學術論文
畢業學年度:104
語文別:中文
中文關鍵詞:熱熔射噴塗、多孔性結構、抗腐蝕塗層、水下吸音鍍層
外文關鍵詞:Thermal SprayAcoustic AbsorptionPorous StructureCorrosion Resistibility
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本研究使用熱熔射噴塗法製備在水下環境中,具有防蝕及吸音的複合塗層,利用鋅鋁塗層中,鋅的犧牲陽極保護機制,和鋁可在塗層表面上形成穩定的氧化物等兩個優點,能夠做為屏障保護基材,以及,高分子材料的化學惰性能降低內層金屬的氧化及黏彈性能造成吸收聲波等特性,在基材上依序製備塗層,首先,在基材上噴塗鋅鋁合金層作為抗蝕層,第二,在鋅鋁抗蝕層上噴塗封孔保護層,封孔層主要材料為高分子材料。製備完成之試片分別進行吸收聲波、鹽霧試驗、繞射分析、CT以及SEM等量測分析,觀察複合塗層晶體結構、表面之形貌及橫截面顯微結構觀察、吸音特性之影響,以及抗蝕塗層的耐腐蝕能力性質評估。
實驗結果顯示,在基材上噴塗約300 µm厚的鋅鋁塗層,經5天鹽霧試驗後,橫截面結果顯示厚度無明顯的變化,但在微結構已有裂縫的產生;封孔層結果部份,在高分子材料中分別膨脹石墨作為封孔層皆可產生多孔性結構,其中,在環氧樹脂中添加20 vol. %的膨脹石墨具有最佳的多孔性結構及優異的厚度表現;另外,在高分子材料中分別玻璃微球作為封孔層,其分散性不佳且有部份玻璃微球無法以完整形貌存在於封孔層中;聲波數據結果顯示,塗層厚度會影響吸收聲波之效果使得吸聲係數落在0.4-0.7之間,當施以靜水壓後吸聲係數會下降,是因為試片會產生機械性壓縮使得密度造成改變,此時,材料和介質的阻抗值不匹配,而破壞了吸聲機制使得吸聲係數下降。
In this research, we using thermal spray technique to fabricate a coating which is multifunction composite with sound absorption and corrosion resistibility in underwater ambience, the Zn-Al coating were protected against corrosion because of the sacrificial anode protection mechanisms of the Zn, and Al created a stable oxide on the coating surface and protects the substrate, as well as, the polymer material which chemical inert not only decreasing inner metal oxidation, but also viscoelasticity cause acoustic absorption etc. characteristic, we can start to spraying and fabricate the coating, where spraying order, first is spraying Zinc-Aluminum alloys as a corrosion coating, and second is, spraying polymer materials as a sealing coating. After spraying the samples will go to impedance tube measurement the properties of acoustic absorption, and using salt spray test to acceleration the Zinc-Aluminum coating corrosion rate, that can evaluation the coating corrosion resistibility, X-ray diffraction to ensure the crystal structure and component of coating, Computed Tomography (CT) to determine the porous structure of three-dimension, using Scanning Electron Microscopy (SEM) to observe the surface topography of coating and cross-sectional microstructure how to influence the properties of acoustic absorption, and after salt spraying coating surface topography.
The results shown, spraying Zn-Al onto the substrate, the thickness is about 300 um, after 5 days salt spray test, we can also see the thickness has not obvious change, However, the thickness has not obvious change, it still has some changes of the microstructure, the micro-cracks were occurring near the surface layer, it means zinc has been considerable sacrificial, which makes the zinc doesn’t as a sacrificial role to protection and make the cracks occur.
The results shown, spraying Zn-Al onto the substrate, the thickness is about 300 um, after 5 days salt spray test, we can also see the thickness has not obvious change, However, the thickness has not obvious change, it still has some changes of the microstructure, the micro-cracks were occurring near the surface layer, it means zinc has been considerable sacrificial, which makes the zinc doesn’t as a sacrificial role to protection and make the cracks occur. Sealing layer part, add different proportion expansion of graphite into the polymer materials to as sealing layer, which can create porous structure, Where, using epoxy containing 20 volume percent expansion of graphite have a good performance on porosity and thickness. Furthermore, add different proportion Micro-spherical glass shell into the polymer materials to as sealing layer, its distribution was non-uniform and morphology was incomplete. The results of acoustic analysis part show that acoustic absorption was between 0.4 to 0.7, while the acoustic absorption decreasing with the hydrostatic pressure increasing , the reasons is mechanical compression on the specimen causing the density change to increase, that caused the acoustic absorption coefficient decreasing.
摘 要...i
ABSTRACT...iii
誌 謝...vi
目錄...vii
表目錄...x
圖目錄...xi
第一章 緒論...1
1-1 前言 ...1
1-2 研究動機...2
1-3 研究目的 2
第二章 文獻回顧 3
2-1 水中聲學與水下吸聲材料...3
2-1-1 水中聲學發展史...3
2-1-2 水下吸聲材料發展史...4
2-2 水下吸聲材料概論...6
2-2-1 水下吸聲材料的吸聲機制...6
2-2-2 水下吸聲材料...7
2-2-3 水下吸聲材料之吸聲結構...8
2-3複合塗層之材料選用...12
2-3-1 抗腐蝕材料...12
2-3-2 封孔層材料...15
2-3-3填料選用...17
2-4熱熔射噴塗...18
2-4-1 火焰熔射...19
2-4-2 熔射火焰簡介...20
2-4-3 熔射塗層性質與顯微結構...21
第三章 實驗方法與步驟...23
3-1 實驗流程...23
3-2 試片製備...24
3-3 複合塗層之吸收聲波量測...29
3-3-1 水聲阻抗管之設計...29
3-4 X-ray繞射分析儀...30
3-5 塗層特徵評估...30
3-6電腦斷層掃描...31
3-7鹽霧試驗...31
3-7-1 鹽水試驗條件...31
3-7-2具鋅鋁合金披覆層...31
3-8塗層結合強度...32
第四章 結果與討論...33
4-1 鋅鋁抗蝕層之性質量測...33
4-1-1 鋅鋁塗層之X-ray繞射分析...33
4-1-2 鋅鋁塗層之顯微結構...34
4-1-3 鹽霧試驗...36
4-1-4 鋅鋁塗層接合強度與破壞機制...40
4-2 封孔層中添加膨脹石墨粉...42
4-2-1封孔層與複合塗層顯微結構...42
4-3 於封孔層中添加玻璃微球...48
4-3-1封孔層與複合塗層顯微結構...48
4-4 複合塗層之水下吸收聲波圖譜...53
4-5 塗層厚度對波長及聲波阻尼效果探討...53
4-6 複合塗層與消聲瓦之功效探討...54
第五章 結論...64
參考文獻...65
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