Effect of Alloying and Impurity Elements In Magnesium Alloy Cast Anodes

Data from extensive laboratory anode efficiency tests and supporting field tests illustrate the need for low impurity levels in the 6% Al—3% Zn magnesium alloy cast anodes. Data are presented which show the detrimental effects of the impurities copper, nickel, iron, lead and tin; the beneficial effect of manganese in counteracting to some extent the effects of iron and perhaps copper; the absence of any pronounced effect of aluminum and zinc in the amounts specified in this alloy; and the inertness of small additions of beryllium on the anode efficiency.