Effects of Alloy Chemistry Changes on Sacrificial Aluminum Anode Performance, Tri-Service Committee on Corrosion Proceedings

摘要

The set of aluminum alloy sacrificial anodes taken from the upper starboard sternarray from a Navy submarine was evaluated at CDNSWC to determine the cause of non-uniform utilization during the approximately 30 month anode service period. Physical data from the used anodes as well as electrochemical characterizations Were determined. The evidence indicated that the three distinct levels of anode weight change (and estimated discharge current) could be attributed to distinct levels of mercury contamination in the three heats of alloy from which these particular anodes were taken. The experience shows that reasonable vendor care in alloy preparation and anode casting must be taken for uniform anode performance to be achieved in multi-anode array applications.