臺灣博碩士論文加值系統

鎂合金廣泛用於航空、汽車、電子產品等工業，但因其高電化學活性及較差的耐腐蝕性，使其應用受到了限制，對鎂合金成長化學轉化膜則可有效改善這些缺點，例如：鉻酸鹽、錫酸鹽、磷酸鹽等皮膜，其中磷酸鹽皮膜已大量的使用在鎂合金上，常見的為磷酸鋅及磷酸錳皮膜，但大部分的磷酸鹽皮膜研究只集中於單一種磷酸鹽皮膜，本研究為在AZ91D鎂合金上成長磷酸鹽複合皮膜，透過調整磷化液中氧化鋅的含量，成長不同鋅錳比之磷酸鹽複合皮膜。利用掃描式電子顯微鏡(SEM)、能量散射光譜儀(EDS)、X光繞射儀(XRD)分析其表面形貌、元素含量、皮膜結構，雙功能膜厚計分析膜厚，並利用電化學分析，來探討不同鋅錳比之磷酸鹽複合皮膜的性能。為了了解磷酸鹽皮膜成長過程，在不同磷化時間下，討論生成之磷酸鹽皮膜表面形貌、元素含量、結構等特性。實驗結果顯示，當氧化鋅添加量達到4g/L時磷酸鹽複合皮膜完整覆蓋基材，此時膜厚最厚，有最好的表面形態，所生成之複合皮膜主要由Mn3(PO4)2･3H2O、Zn3(PO4)2･4H2O、Mn(OH)2及Zn組成，有最低的腐蝕電流密度及較高的腐蝕電位。磷化過程大約分成兩個階段：1.在前100秒時晶體聚集成長並覆蓋鎂合金基材。2.在100至600秒間，於已形成之皮膜上方繼續成長，形成外層板狀內層塊狀的緻密結構。

Magnesium alloys are widely used in aviation, automotive, electronic products and other industries, but their application is limited due to their high electrochemical activity and poor corrosion resistance. Therefore, chemical conversion coatings for magnesium alloy can effectively improve these shortcomings such as chromate, stannate, phosphate, etc. Phosphate coatings have been widely used on magnesium alloys, and the more common ones are zinc phosphate and manganese phosphate coatings. In this study, by adjusting the content of zinc oxide in the phosphating solution, a phosphate composite coating with a different zinc-manganese ratio was grown on AZ91D. Scanning electron microscope (SEM), energy dispersive spectrometer (EDS), and X-ray diffraction (XRD) were used to analyze the surface morphology, element content, film structure. Dual-function film thickness meter was used to analyze the film thickness, and the electrochemical analysis was used to explore the performance of phosphate composite coatings with different ratios of zinc and manganese. In order to understand the growth process of the phosphate composite coating, the surface morphology, element content, structure and other characteristics of the phosphate coating produced at different phosphating times was investigated in this paper. The experimental results showed that when the amount of zinc oxide reaches 4g/L, the phosphate composite film completely covers the substrate. At this time, the film thickness is the thickest and has the best corrosion resistance. The resulting composite film is mainly composed of Mn3(PO4)2･3H2O, Zn3(PO4)2･4H2O, Mn(OH)2 and Zn, and it has the lowest corrosion current density and higher corrosion potential. The phosphating process is roughly divided into two stages: 1. Crystals grow and cover the magnesium alloy substrate during the first 100 seconds. 2. In 100 to 600 seconds, continue to grow above the formed film, forming a dense structure with an outer plate-like inner layer.

目錄 I
圖目錄 IX
表目錄 XII
第一章 緒論 1
第二章 基礎理論與文獻回顧 3
2-1 磷酸鹽皮膜 3
2-2 磷酸鋅皮膜 4
2-3 磷酸錳皮膜 9
2-4 磷酸鎂皮膜 11
2-5 磷酸鹽複合皮膜 14
第三章 研究方法 43
3-1 實驗材料 43
3-2 實驗方法 43
3-3 實驗流程 44
3-3-1 試片製備 44
3-3-2 前處理 44
3-3-3 磷化處理 45
3-4 儀器原理 46
3-4-1 雙功能膜厚計 46
3-4-2 掃描式電子顯微鏡(SEM)與能量散射光譜儀(EDS) 47
3-4-3 X光繞射儀(XRD) 48
3-4-4 X射線光電子光譜(XPS) 49
3-4-5 電化學分析儀 49
第四章 結果與討論 73
4-1 成長磷酸鹽複合皮膜 73
4-2 成長不同鋅錳比之磷酸鹽複合皮膜 75
4-2-1 不同鋅錳比磷酸鹽複合皮膜之OCP分析 75
4-2-2 不同鋅錳比磷酸鹽複合皮膜之表面形態分析 76
4-2-3 不同鋅錳比磷酸鹽複合皮膜之膜厚分析 77
4-3 成長不同時間之磷酸鹽複合皮膜 77
4-3-1 不同時間磷酸鹽複合皮膜之表面形態分析 77
4-3-2 不同時間磷酸鹽複合皮膜之膜厚分析 78
4-4成長不同鋅錳比磷酸鹽複合皮膜之結構分析 79
4-4-1 不同鋅錳比磷酸鹽複合皮膜之XRD分析 79
4-4-2 不同鋅錳比磷酸鹽複合皮膜之XPS分析 80
4-5 不同鋅錳比磷酸鹽複合皮膜之電化學分析 81
4-5-1 不同鋅錳比磷酸鹽複合皮膜之極化曲線 81
4-5-2 不同鋅錳比磷酸鹽複合皮膜之交流阻抗 82
第五章 結論 104
參考文獻 105

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