鋁鋅銦犧牲陽極應用於鋼板防蝕效能之試驗及數值之研究

An Experimental and Analytical Study of the Al-Zn-In Anode Used in Marine Steel Structures

本研究採用鋁鋅銦合金製作海洋用犧牲陽極，並利用試驗法評估其在人造海水之開路電位、電流容量及電流效率；並使用邊界元素法評估鋼板之電位分佈。試驗結果顯示鋼材外施電位在-0.78V(SCE)可免於生銹；數值解與實驗值比較尚稱吻合；將鋼片與鋁合金耦合，面積比例為4000時仍能充分防蝕。

The performance of Al-Zn-In alloy as sacrificial anodes for cathodic protection in sea water was investigated in this study. Open circuit potential, current capacity and current efficiency of the Al-Zn-In alloy were evaluated in standard artificial sea water solutions at room temperature. Numerical solutions for potentials were obtained by the boundary element method. Results show that steel sheet can be protected by applying a potential at － 0.78V(SCE) or more negative and that numerical solutions and experimental data fit fairly well. The effect of area ratio of steel to sacrificial anode was examined. Steels can be protected under the area ratio up to 4000.