A wide range of magnesium, aluminum and zinc alloys used for production of sacrificial anodes for Cathodic Protection Systems (CPS) are well known. But in most cases the use of anodic materials has unpredictable properties – a wide range of potential, current consumption and cost. More than 25 years’ experience in the development of sacrificial anodic material, manufacturing technologies, application experience of CPS with sacrificial anodes in different natural environments (sea water, soil, aqueous solutions), showed that in most cases the composition of alloys and technological processes are very far from optimal. The current consumption can be ± 20%, potential ±100-200 mV to the level recommended for design and application. This situation creates problems in application and increases the cost of CPS. This paper presents alloys test results that established the relationship between the main electrochemical, chemical, metallurgical properties of magnesium, aluminum and zinc alloys and achieving much higher and more stable current consumption of sacrificial anodes.
Keywords: sacrificial, alloys, compositions, technology, properties