臺灣博碩士論文加值系統

本研究主要以ADC12鋁矽合金在不同濃度硫酸溶液中添加硼酸，使用定電流密度、直流單極脈衝方式進行陽極處理；改變硫酸濃度、脈衝占空比、電流密度等參數對陽極氧化膜性質之影響。
結果顯示電流密度的增加會使表面氧化膜的膜厚、粗糙度以及孔徑大小增加。添加硼酸使氧化膜的粗糙度降低而增加其耐腐蝕性質，且膜厚隨著硼酸濃度增加而增加;添加20 g/l硼酸可使膜厚比單一硫酸下之膜厚多增加34%。添加硼酸使膜厚增加，ADC12鋁合金陽極氧化膜膜厚增加率遠遜於純鋁材陽極氧化膜厚增加率，主要是ADC12鋁合金氧化膜中富含矽元素之β相具較慢之氧化速率所致。

This research is to investigate the effect of boric acid addition in aqueous sulfuric electrolytic solution on the formation of anodic coating on ADC12 aluminum alloy using pulsed DC sources at different constant average current densities and duty cycles. Under the conditions of electrolytes of sulfuric acid from 12 to 20wt%, bath temperature of 20℃ and anodizing time of 30 minutes, the addition of 15g/L boric acid obtains the improvement in corrosion resistance due to lower roughness of anodic coatings. In addition, increasing the addition of boric acid from 0g/L to 20g/L in 20wt% sulfuric acid solution showed the increase of 34% of film thickness, and increasing the current density from 2 to 2.5 A dm-2 demonstrated the increase of thickness, roughness, and pore size of anodic coating on the aluminum alloy. Using additional boric acid in aqueous sulfuric acid solution, however, owing to the slower anodizing rate of silicon-rich β phase in ADC12 aluminum alloy, the increase of thickness of anodic coating on ADC12 is much less than that on pure aluminum.

致謝 i
中文摘要 ii
英文摘要 iii
目錄 iv
表目錄 vii
圖目錄 viii
第一章 序論 1
1.1前言 1
1.2研究動機 2
第二章 文獻回顧 3
2.1 鋁合金的種類 3
2.2 鋁矽合金 3
2.3 ADC12 5
2.3.1 ADC12的成分 5
2.3.2 ADC12的性質 5
2.4 鋁的陽極氧化法 6
2.4.1 陽極氧化簡介 6
2.4.2 硫酸電解液 7
2.4.3 硫酸-硼酸電解液 7
2.4.4鑄造鋁的陽極處理 7
2.4.5 ADC12的陽極處 8
第三章 實驗方法與原理 9
3.1實驗材料與前處理 9
3.2 陽極氧化處理 11
3.2.1實驗步驟 11
3.2.2 實驗参數與設備 12
3.2.3封孔 13
3.3陽極氧化膜層分析 13
3.3.1陽極氧化膜層膜厚分析 13
3.3.2陽極處理膜層粗糙度分析 13
3.3.3 陽極處理膜層耐腐蝕分析 14
3.3.4陽極處理膜層硬度分析 14
3.3.5陽極處理膜層表面形態分析 15
3.3.6 氧化膜層橫截面顯微組織分析 15
第四章 結果與討論 19
4.1最終電壓分析 19
4.2陽極氧化氧化層膜厚分析 25
4.3陽極氧化氧化層粗糙度分析 31
4.4陽極處理膜層耐腐蝕分析 37
4.5陽極氧化氧化層硬度分析 41
4.6陽極氧化氧化層表面形貌分析 47
4.7氧化膜層橫截面顯微組織分析 50
第五章 結論 53
參考文獻 54

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