Abstract
The effects of additional elements on the galvanic anode properties of aluminum and its alloys were examined.The anodic behaviors were determined under the following experimental conditions:Anodic current density……1mA/cm2electrolyte……artificial sea water at room temperatureperio……168hr.Throughout the test, the anode potential was measured at regular intervals and the final weight loss of the anode was also measured.The results obtained were as follows.(1) For pure aluminum (99.7-99.8%), the addition of Zn, Sn, In, or Hg improved anode performance. Hg was the most effective among them.(2) For Al-3% Zn alloy, Al-0.1% Sn alloy, and Al-0.1%, In alloy, the addition of Ti or Zn was comparatively effective, but other additional elements were no effective, except Zn, Sn, In, and Hg.(3) For Al-Mg alloys, Al-Zn alloys, and Al-Sn alloys, the addition of Hg was very effective.The alloys containing 0.05% of Hg showed anode potential of-1.00--1.05V and current efficiency of 90-95%. However, the corrosion of Al-Hg alloys was not uniform.
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