臺灣博碩士論文加值系統

本研究將銅分別與不同系列鋁合金耦合後量測其電位差，並置於3.5%氯化鈉溶液中，經1、5、10、20、30及70天的腐蝕後觀察其金相顯微組織，根據金相顯微組織分析不同鋁合金元素對伽凡尼腐蝕的影響。由動態極化曲線可發現銅合金的腐蝕電位大於鋁合金，銅合金在3.5%氯化鈉溶液的動態極化掃描出鈍化區，而鋁合金則無鈍化區的現象。耦合對之中電位差最高者為AA7475-C1100耦合對，電位差最低為AA1050-C1100耦合對。
從鋁合金和銅合金的金相顯微組織觀察到，鋁合金的表面腐蝕情況皆比銅合金嚴重，並且在銅的表面顯微組織觀察出有附著大面積的腐蝕生成物，以EDS分析具有鋁的成分，這是因為作為陽極的鋁合金陸續解離形成金屬離子，部分金屬離子與水溶液產生反應而沉積於銅表面，因此作為陽極的鋁合金加速被腐蝕，反之，銅合金則因此受到保護。

In this study, the potential of couples, copper and various aluminum alloys, were measured. The metallographic microstructures of the couples after immersion in 3.5%NaCl solution for 1, 5, 10, 20, 30 and 70 days were observed. According to the microstructures, the influence of different aluminum alloys on galvanic corrosion was analyzed. The dynamic polarization curve showed that the corrosion potential of copper was higher than aluminum alloy. From the result of the dynamic polarization scan , a passive region was found for copper in 3.5%NaCl solution. However it was not found for aluminum alloys. The highest potential was the AA7475-C1100 couple, the lowest potential was the AA1050-C1100 couple.
The metallographic microstructures showed that corrosion of aluminum alloys were more serious than copper. From the observation of microstructures, large area of corrosion products was found on the surface of copper.
From the result of EDS analysis, the corrosion products contained aluminum. Aluminum anode dissolved and reacted with solution. The products deposited on the surface of copper . Therefore, an accelerate corrosion was found at the aluminum alloys. Copper was protected from the corrosion.

摘要 i
Abstract ii
目錄 iii
表目錄 v
圖目錄 vi
第一章、緒論 1
第二章、理論與文獻回顧 3
2.1 鋁及鋁合金 3
2.1.1鋁合金種類與代號 4
2.1.2鋁及鋁合金之物理性質 6
2.1.3 鋁及鋁合金之化學性質 7
2.1.4 鋁及鋁合金之機械性質 7
2.1.5 合金元素對鋁合金的影響 8
2.2 電化學腐蝕試驗 10
2.3 鋁合金電化學性質 11
2.4 黃銅合金電化學性質 12
2.5 伽凡尼腐蝕 14
第三章 實驗步驟與方法 17
3.1 實驗流程 17
3.2 實驗材料 18
3.2.1 1050鋁合金 18
3.2.2 3003鋁合金 18
3.2.3 5083鋁合金 19
3.2.4 6061鋁合金 19
3.2.5 7475鋁合金 20
3.2.6 C1100純銅 20
3.3 腐蝕電化學試驗 21
3.3.1 動電位極化法原理 21
3.3.2 動態極化操作參數 23
3.4 微觀結構與成分分析 24
3.4.1 場發射型掃描式電子顯微鏡(FE-SEM)觀察 24
3.4.2 能量散佈分析儀(EDS)分析 25
3.5 浸泡實驗 26
3.5.1 單金屬鹽水浸泡實驗 26
3.5.2 伽凡尼腐蝕實驗 26
第四章 實驗結果與討論 27
4.1電化學腐蝕試驗 27
4.1.1 動態極化曲線分析 27
4.1.2 動態極化曲線 27
4.2 鹽水腐蝕-單金屬 32
4.2.1 1050 鋁合金金相 32
4.2.2 3003 鋁合金金相 36
4.2.3 5083 鋁合金金相 39
4.2.4 6061 鋁合金金相 42
4.2.5 7475 鋁合金金相 45
4.2.6 C1100純銅金相 48
4.2.7 耐腐蝕性比較 51
4.3 耦合對之伽凡尼腐蝕電流量測 52
4.4 鋁銅耦合對-伽凡尼腐蝕 53
4.4.1 C1100-AA1050 耦合對金相 53
4.4.2 C1100-AA3003 耦合對金相 60
4.4.3 C1100-AA5083 耦合對金相 67
4.4.4 C1100-AA6061 耦合對金相 73
4.4.5 C1100-AA7475 耦合對金相 79
4.4.6 耐腐蝕性比較 84
第五章 結論 86
參考文獻 88

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