1991 Volume 40 Issue 10 Pages 661-666
To apply catholic protection technology for steel structures in an arctic sea, performance characteristics of four kinds of aluminum galvanic anodes in the artificial sea water at 273K were investigated by galvanostatic test. It was clarified that in these anodes, Al-Zn-Hg-Si alloy had an excellent anode performance, followed by Al-Zn-In alloy, and on the other hand, anode performance of both Al-Zn-Mg-In-Ca and Al-Zn-Sn-B alloy was strikingly deteriorated due to potential noblement at 273K. Hg containing anodes have an excellent anode performance, but it is difficult to apply these anodes for real fields because of a poisonous effect of Hg to the living things. In order to improve the poor anode performance at 273K of Al-Zn-Mg-In-Ca alloy, which has an excellent anode performance without Hg content at ambient temperatures, galvanostatic tests were carried out to evaluate the effect of the increase of In and Mg content on anode performance. These alloys with increase of In and Mg demonstrated excellent anode performance at a low temperature due to inhibited potential noblement in the low temperature region.
