Metallurgical features in as-cast, aluminum alloy, sacrificial anodes, such as the casting grain size, have been found to vary somewhat dramatically in recent procurements from different vendors. There appears to be a linkage between the casting grain size and the electrochemical performance efficiency. This study documents the physical metallurgy features and electrochemical performance of castings prepared by several techniques over a range of temperatures, and includes information regarding casting cooling rates and heat treatments for grain growth.
Keywords: Sacrificial anodes, indium activated aluminum anodes, casting grain size, anode efficiency, electrochemical testing