臺灣博碩士論文加值系統

本研究針對鋅電極，探討添加K2HPO4或KBrO3於KOH溶液中對鋅之陽極溶解及鈍化的影響。就鈍化電位而言，K2HPO4的加入可稍微提昇其鈍化電位，且濃度愈高，效果愈顯著;而KBrO3的加入則對提昇鈍化電位沒有太大的助益，甚至會降低鈍化電位。就陽極溶解速率而言，K2HPO4的加入會降低反應電流;而KBrO3在低濃度時則會稍稍提高鈍化電流值，但整體效果並不明顯。
從溫度效應方面來看，研究的結果顯示鹽膜及鈍化膜皆有所影響，因為添加物加入之後，活化能有所改變。濃度效應方面，K2HPO4的濃度愈高，鈍化電流愈低;另外，Tafel斜率在前半段是隨濃度的增加而增大，後半段則由於膜已生長，Tafel斜率幾乎不受濃度的影響; KBrO3則是在低濃度時，鈍化電流隨濃度的增加而上升，不過，濃度超過臨界值後，鈍化電流反而下降;就KOH濃度效應方面，KOH濃度的提高可降低前半段的Tafel斜率，但對後半段則沒有太大的影響。在流力效應部份，轉速增加，質傳上升，所以電流值提高，Tafel斜率(前半段)降低。

The present experimental study aimed at investigating the effects of additives K2HPO4 and KBrO3 on the anodic dissolution and passivation of zinc in KOH solutions. Adding K2HPO4 raised passivation potential slightly, but resulted in decreasing anodic dissolution rate. Higher concentrations had remarkable effects. Adding KBrO3 didn’t raise passivation potential. The passivation potential decrease, but peak current density increased slightly.
Experimentally, it was found that the activation energy changed with the addition of K2HPO4 and KBrO3. As for the effects of the concentration of additives, the higher the concentration, the lower the peak density. Tafel slopes at lower potentials increased as concentration of K2HPO4 increased. However, Tafel slopes at higher potentials were essentially inpendent of concentration of additives used. The effects of KBrO3 were more complicated. When KBrO3 was lower than acritical value, the peak currents increased with concentration of KBrO3. The variation of Tafel slopes measured in KOH solutions followed a similar pattern as observed in additive-containing system. The effect of rotation rate was also examined. Generally, mass transfer enhanced as rotation rate was increased. The peak current density increased with the rotation rate, but the Tafel slope decreased with increasing rotation rates.

中文摘要…………………………………………………………………….Ⅰ
英文摘要…………………………………………………………………….Ⅱ
致謝………………………………………………………………………….Ⅲ
目錄………………………………………………………………………….Ⅳ
圖表索引…………………………………………………………………….Ⅵ
第一章 緒論…………………………………………………………………1
第二章 文獻回顧……………………………………………………………3
第三章 實驗裝置及方法……………………………………………………13
3.1實驗裝置………………………………………………………………13
3.1.1反應器的設計………………………………………………………13
3.2實驗儀器………………………………………………………………13
3.3實驗藥品………………………………………………………………16
3.4研究方法………………………………………………………………17
3.5實驗步驟………………………………………………………………17
第四章 結果與討論…………………………………………………………24
4.1平板電極部份…………………………………………………………24
4.1.1純KOH溶液…………………………………………………………24
4.1.2KOH溶液+K2HPO4……………………………………………………29
4.1.2.1循環伏安法………………………………………………………29
4.1.2.2準穩態動電位掃描………………………………………………36
4.1.2.2.1溫度效應………………………………………………………36
4.1.2.2.2添加物(K2HPO4)濃度效應……………………………………37
4.1.2.2.3 KOH濃度效應…………………………………………………44
4.1.3 KOH溶液+KBrO3……………………………………………………47
4.1.3.1循環伏安法………………………………………………………47
4.1.3.2準穩態動電位掃描………………………………………………48
4.1.3.2.1溫度效應………………………………………………………48
4.1.3.2.2添加物(KBrO3)濃度效應……………………………………49
4.1.3.2.3 KOH濃度效應…………………………………………………55
4.2旋轉圓盤電極…………………………………………………………56
4.2.1純KOH溶液…………………………………………………………56
4.2.2KOH溶液+K2HPO4……………………………………………………61
4.2.2.1準穩態動電位掃描………………………………………………61
4.2.2.1.1溫度效應………………………………………………………61
4.2.2.1.2添加物(K2HPO4)濃度效應……………………………………62
4.2.2.1.3 KOH濃度效應…………………………………………………64
4.2.2.1.4流力效應………………………………………………………68
4.2.3 KOH溶液+KBrO3……………………………………………………72
4.2.3.1準穩態動電位掃描………………………………………………72
4.2.3.1.1溫度效應………………………………………………………72
4.2.3.1.2添加物(KBrO3)濃度效應……………………………………74
4.2.3.1.3流力效應………………………………………………………77
4.3SEM觀察………………………………………………………………80
第五章 結論…………………………………………………………………84
參考文獻……………………………………………………………………88
附錄A…………………………………………………………………………91
附錄B…………………………………………………………………………92
作者簡介……………………………………………………………………93
授權書………………………………………………………………………94

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