臺灣博碩士論文加值系統

達克羅是一種防蝕技術，在世界各國中已經是普遍使用的防蝕技術，由微米片狀鋅粉、微米片狀鋁粉、鉻酸等其化學藥劑組成，在美國及歐洲這是一個很普遍的防蝕技術，在亞洲中國大陸、日本也已經有達克羅防蝕技術研究投入，台灣也有達克羅處理，然而也只有代理技術而己，極少有相關研究單位投入塗料的分析與製備，達克羅的製程為調配達克羅塗液在噴砂除油後的低碳鋼基材上，經過二階段約280~320°C/ 30~40min燒結後冷卻，所得的銀色塗層為達克羅防蝕膜。
本研究以綠色製造為目標，以鉬酸鹽類替代達克羅塗料成份中的鉻酸，去除危害環境及人體的物質：六價鉻、三價鉻，配置無鉻達克羅液。根據實驗指出，未經潤濕劑及分散劑的金屬粉末屬於不穩定性的狀態，容易與水及酸性反應藥劑產生氧化並產生氣體膨脹，故需要先用PEG、OP-10均勻混合處理(保護)，並將金屬粉末與反應酸性化學藥劑分為兩劑的形式。反應劑需分析穩定性、相容性與pH值，實驗中最好的塗層表面成份參數為每30~40ml需含有：片狀鋅粉：3~5g、鋁粉：0.3~0.5g、乙二醇：3g、聚乙二醇：水=(2:1) 10g、OP-10：去離子水=(1:5)3g，與粉末使用比例不超過1:1，鉬酸鈉：0.08~0.3g、硼酸：0.01~0.1g、甲酸：0.05g、丁二酸：0.1g、磷酸三鈉：0.5g、消泡劑：0.3~0.5g、去離子水：5~15g、OP-10：矽溶膠=(1:14)10g為適合的範圍，由SEM能觀察到表面片狀金屬的黏合的情況，厚度最薄為40µm，腐蝕電位最接近市面上達克羅樣片為Potential/V：-1.152, Current/A：2.421e-6, log(i/A)：-5.616e+0。

Dacromet was an emerging anticorrosion technology which performance was better than traditional anticorrosion technology. It’s consisting of micron zinc flake powders, micron aluminum flake powder, chromic acid, and other chemicals. It’s a general anticorrosion technology in the United States and Europe. In the Asia, just Japan and China had Dacromet anticorrosion technology study. Taiwan also had Dacromet treatment, however only had proxy it technology. There were few research institutes had Dacromet analyzed and preparation. The Dacromet process were deployed the Dacromet paint on the low carbon steel substrate which had sandblasting and removing oil. The following was two stages heat treatment approximately 280~320°C /30~40min, then air-cooling. The silver film was the Dacromet anticorrosion layer.
In this study, the green manufacture was our goal, we used molybdate salts to replace the chromic acid because chromic will produce the Cr6+and Cr3+ in chemical reaction. There are harmful to environment and human. According the experiment result, we found that powder without wetting dispersant agents was an instability state, there were easy had chemical reactions with acid reaction agents then oxidized and produced the gas. As this reason, should mix with PEG and OP-10 to improve (protect), and then divided the metal powder and acid chemical reaction agents as two agents form. The reaction chemicals should analysis the stability, compatibility with the pH value. In this study experiments, the best of the surface composition for 30~40ml were: zinc powder:3~5g, aluminum powder:0.3~0.5g, EG:3g PEG: D.I water=(2:1)10g, and the powders: diluted PEG(PEG: D.I water=2:1), not more then (1:1), molybdate salts: 0.1~0.3g, H3BO3: 0.01~0.1g, FA:0.05g, C4H6O4: 0.1g, Na3PO4: 0.5g, OP-10：Colloidal Silica =(1:14) 10g, and D.I water 5~15g. Observing from SEM surface, some part of metal powder had bonded with adhesives agents, and the thickness of the thinnest was 40µm. The most closed the Dacromet sample specimen of corrosion potential were: potential/V：-1.152, current/A：2.421e-6, log(i/A)：-5.616e+0。

中文摘要………………………………………………………………………………………………………………………I
Abstract…………………………………………………………………………………………………………………II
誌謝……………………………………………………………………………………………………………………………IV
圖目錄………………………………………………………………………………………………………………………04
表目錄………………………………………………………………………………………………………………………06
第一章 緒論……………………………………………………………………………………………………………08
1.1 前言…………………………………………………………………………………………………………………07
第二章 基礎理論…………………………………………………………………………………………………09
2.1腐蝕……………………………………………………………………………………………………………………09
2.2文獻回顧…………………………………………………………………………………………………………13
2.3酸鹽鈍化處理發展………………………………………………………………………………………17
2.4分散劑之分散原理………………………………………………………………………………………19
第三章 實驗規劃…………………………………………………………………………………………………20
3.1實驗流程圖………………………………………………………………………………………………………20
3.2實驗材料……………………………………………………………………………………………………………27
3.3 使用設備與儀器……………………………………………………………………………………………40
3.4 藥品配置…………………………………………………………………………………………………………50
第四章 達克羅樣片分析與討論………………………………………………………………………52 4.1 SEM表面形貌分析…………………………………………………………………………………………52
4.2 X-ray繞射分析………………………………………………………………………………………………53
4.3塔弗曲線分析……………………………………………………………………………………………………54
第五章 結果與討論…………………………………………………………………………………………………55
5.1鉬酸鹽類溶液試驗分析…………………………………………………………………………………55
5.2鋅粉與反應劑混合之探討……………………………………………………………………………61
5.3分散/潤濕劑稀釋……………………………………………………………………………………………63
5.4 試片編號與結果……………………………………………………………………………………………68
5.5 試片分析…………………………………………………………………………………………………………79
第六章 結論………………………………………………………………………………………………………………86
參考文獻………………………………………………………………………………………………………………………88
 

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