Zinc

There are various materials used by Sacrificial Anodes, however, the alloys of magnesium, zinc and aluminum are the most common. Magnesium unalloyed not be used in cathodic protection systems in seawater due to its rapid deterioration, although it used some of its alloys.

Also used some aluminum alloys, but the most used Sacrificial anodes are zinc, which is necessary to control and, in addition, provide a steady and efficient. A prevailing of such anodes is the base metal purity, the composition must be in line with the specifications currently available in this regard. Iron is one of the most harmful impurities anodic activity of zinc, is tolerated up to 50 ppm of Fe if at the same time.