In view of its superior characteristics such as high energy capability, long life, light weight, and low cost, aluminium alloy sacrificial anodes have become popular for the protection against corrosion of structures submerged in seawater. With a view to developing aluminium alloy hanging anodes and high efficiency aluminium alloy sacrificial anodes, different percentages of magnesium and bismuth were added separately to (Al + 5 % Zn + 0.03 % In), and electrochemical studies were carried out. The results show that the composition containing 0.4 % bismuth exhibits minimum open-circuit potentials and hence it can be used as a hanging anode. It was also observed that the closed-circuit potentials were shifted to the anodic direction with increasing magnesium and bismuth contents, and the efficiency of the anode was inversely proportional to the percentages of magnesium and bismuth in the alloy anode. Formation of intermetallic compounds with the addition of magnesium and bismuth are responsible for the decrease in anode efficiency and increase in closed-circuit potential.
Development of aluminium alloy anodes for cathodic protection of ships
Entwicklung von Aluminiumlegierungsanoden für den kathodischen Schutz von Schiffen
Corrosion Prevention and Control ; 43 , 3 ; 77-81
1996
5 Seiten, 4 Bilder, 2 Tabellen, 15 Quellen
Article (Journal)
English
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