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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 林招松 | |
dc.contributor.author | Ren-Shou Liu | en |
dc.contributor.author | 劉人碩 | zh_TW |
dc.date.accessioned | 2021-06-15T01:12:33Z | - |
dc.date.available | 2009-07-31 | |
dc.date.copyright | 2009-07-31 | |
dc.date.issued | 2009 | |
dc.date.submitted | 2009-07-29 | |
dc.identifier.citation | 1. T. Biestek and J. Weber, Electrolytic and Chemical Conversion Coating, Portcullis Press, Portcullis Press, Redhill (1976).
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/42357 | - |
dc.description.abstract | 熱浸鍍鋅鋼板具有優異的機械性質,廣泛用於各種工程及日常用品上。然而,熱浸純鋅鋼板在運送及存放過程中易腐蝕。故六價鉻鈍化處理在過去數十年常用來提升熱浸純鋅鋼板的抗蝕性,但六價鉻具有致癌性,同時嚴重污染生態環境,已嚴格限用。因此開發取代無鉻鈍化處理之製程更形迫切。
本研究嘗試在磷酸鹽鈍化液中添加鎂離子,對熱浸純鋅板進行化成處理,以調整化成皮膜表面之結晶形態,藉以提昇化成皮膜的抗蝕性。試片經化成處理後,以掃瞄式電子顯微鏡、橫截面穿透式電子顯微鏡以及低掠角X-ray繞射分析皮膜的表面型態和微結構。以極化曲線與鹽霧試驗量測皮膜的抗蝕性質,以 450℃耐高溫試驗檢測皮膜的耐熱性。最後以百格試驗量測皮膜的附著性。 結果顯示,熱浸純鋅鋼板磷酸鹽化成處理液中含有適量之鎂離子及鋅離子時,鎂離子可取代原本磷酸鋅(hopeite)化成皮膜中鋅離子之結晶位置,形成結構相似之磷酸鹽(hopeite(Mg-exchanged,syn. )皮膜,並增加化成液中陽離子與磷酸根之碰撞機會,在短時間化成處理製程(90秒)即可形成較多磷酸鹽皮膜沉積於試片表面,提升化成皮膜之覆蓋率和抗蝕性;隨著化成處理時間拉長,鎂離子對於皮膜覆蓋率和抗蝕性的影響不明顯。經由SEM表面形貌觀察,含鎂離子之化成液可形成晶粒尺寸較小且較為整齊之皮膜結構。有關化成液中鋅離子的效應發現,當化成液中鋅離子與鎂離子濃度達一定比例時,才有利hopeite(Mg-exchanged)之晶粒生成。而硝酸根為加速鋅底材溶解的氧化劑,對於磷酸鹽化成皮膜的結晶形態,並無顯著之影響。 | zh_TW |
dc.description.abstract | In light of their excellent mechanical properties, hot-dip galvanized (GI) sheet steels have been widely used in various engineering applications and daily supplies. However, the pure zinc coating tends to suffer corrosion during transportation and storage. As a result, hexavalent chromium conversion coating has been employed for decades to improve the corrosion resistance of GI steel. However, hexavalent chromium is a highly toxic and carcinogenic substance. Its use has been limited by several international regulations. Therefore, the development of chromium-free conversion processes for GI steel is an urgent necessity.
This study aims to study the effect of Mg2+ in phosphate conversion solution on the nucleation and growth of the phosphate conversion coating on GI steel. The surface morphology and microstructure of the conversion coating was characterized using scanning electron microscopy, cross-sectional transmission electron microscopy and glancing angle x-ray diffraction. The corrosion resistance of the coating was evaluated using electrochemical polarization measurement and salt spray test. The heat resistance of the coating was studied by heat treatment at 450℃ for 5 min. Finally, the adhesion of the coating was measured using a crosscut tape method The results show that in the phosphate conversion solution containing proper amounts of magnesium ions and zinc ions to, Mg2+ can replace the ionic sites of Zn2+ in hopeite (Zn2(PO4)3•4H2O), giving rise to a similar crystalline phase, i.e. hoepeite (Mg-exchanged) ,(Mg0.62Zn2.38(PO4)2). Moreover, Mg2+ promoted the collisions between cations and PO43-, effectively enhancing the nucleation rate of Zn phosphate crystals on GI steel. As the result, adding proper Mg2+ to phosphate conversion solution increased the coverage of phosphate crystals and improved the corrosion resistance of GI steel after a short time conversion coating treatment. The influence of Mg2+ became insignificant after prolonged conversion treatment. Nevertheless, Mg2+ in the conversion solution refined the size of phosphate crystals and led to the formation of an uniform conversion coating. As for the effect of Zn2+ in the solution, hopeite(Mg-changed) formed in the solution with Zn2+/ Mg2+ ratio exceeding a specific value. Finally, NO3- in the solution hardly affected the morphology and size of phosphate crystals although the presence of NO3- facilitated the dissolution of the GI coating. | en |
dc.description.provenance | Made available in DSpace on 2021-06-15T01:12:33Z (GMT). No. of bitstreams: 1 ntu-98-R96527022-1.pdf: 39908062 bytes, checksum: 15de06054c5ff0c48f5266fe7320f5b6 (MD5) Previous issue date: 2009 | en |
dc.description.tableofcontents | 口試委員會審定書 i
致謝 ii 中文摘要 iii 英文摘要 iv 總目錄 vi 表目錄 viii 圖目錄 ix 第一章 前言 1 第二章 文獻探討 2 2.1 鍍鋅鋼板 2 2.1.1 熱浸鍍鋅鋼板 2 2.1.2 電鍍鋅鋼板 2 2.2鉻酸鹽化成處理 3 2.2.1 六價鉻酸鹽化成處理 3 2.3 磷酸鹽化成處理 5 2.3.1磷酸化成皮膜處理之機制 5 2.3.2 表面調質處理 5 2.3.2 磷酸鹽化成液添加劑的效應 5 2.3.3 磷酸化成皮膜的封孔處理 6 2.4 鉬酸鹽化成處理 7 2.4.1 鉬酸鹽的吸附保護 7 2.5 稀土金屬化成處理 8 2.6 鎂合金上的磷酸鋅化成膜處理 9 2.6.1 鋅離子的影響 9 2.6.2 硝酸根的作用 10 第三章 實驗方法及研究步驟 12 3.1 實驗流程 12 3.1.1材料準備與前處理 12 3.1.2化成處理 12 3.2 微結構觀察 16 3.2.1 掃瞄式電子顯微鏡觀察 16 3.2.3 能量散佈光譜儀 16 3.2.4 横截面TEM試樣製備 16 3.2.5透式電子顯微鏡觀察 17 3.2.6低掠角 x光繞射儀分析 17 3.3 化成皮膜性質分析 19 3.3.1 極化曲線 19 3.3.2 鹽霧試驗 19 3.3.3 附著性測試(百格試驗) 19 3.3.4高溫試驗 20 第四章 實驗結果與討論 23 4.1 鎂離子的效應 23 4.1.1 掃瞄式電子顯微鏡表面形貌觀察 23 4.1.2 含鎂離子化成液處理之試片表面元素面掃瞄 36 4.1.3 SEM之橫截面形貌觀察 41 4.1.4 SEM之橫截面元素面掃瞄分析 41 4.1.5 TEM橫截面觀察 46 4.1.6 低掠角X光繞射分析 53 4.1.6 極化曲線分析 60 4.1.7 百格試驗 62 4.1.8 鹽霧試驗 62 4.1.9 高溫試驗結果 65 4.2 鋅離子濃度的影響 66 4.2.1 含鎂離子但無鋅離子之磷酸鹽化成處理 66 4.2.2 無鎂離子同時無鋅離子之磷酸鹽化成處理 66 4.2.3 鋅離子影響結果討論 67 4.3 硝酸根的影響 70 4.4 綜合討論 72 4.5.1 影響鋅底材溶解之因素 72 4.5.2 鎂離子添加對化成皮膜之影響 73 4.5.3 化成液中鋅離子的影響 73 第五章 結論 75 第六章 參考文獻 76 | |
dc.language.iso | zh-TW | |
dc.title | 鎂離子對於熱浸純鋅鋼板磷酸鹽化成皮膜的影響 | zh_TW |
dc.title | Zinc Phosphate Conversion Coating Treatment of Hot-dip Galvanized Sheet Steel:Effect of Solution Magnesium Ions | en |
dc.type | Thesis | |
dc.date.schoolyear | 97-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 楊木榮,李春穎,陳蓓莉 | |
dc.subject.keyword | 熱浸鍍鋅鋼板,無鉻化成處理,磷酸鹽化成處理,鎂離子,磷酸鋅化成皮膜, | zh_TW |
dc.subject.keyword | hot-dip galvanized steel,chromium-free conversion coating treatment,phosphate conversion coating treatment,Mg2+,Zn phosphate conversion coating, | en |
dc.relation.page | 78 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2009-07-30 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 材料科學與工程學研究所 | zh_TW |
顯示於系所單位: | 材料科學與工程學系 |
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