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The total cost for replacing sacrificial anodes in water heaters and the cost for corrosion-related replacement of water heaters was estimated at $1.24 billion per year. Therefore, the total estimated cost for cathodic and anodic protection is $2.22 billion per year.
A. The three most active materials used in sacrificial anodes are zinc, aluminum and magnesium. They have different properties and uses. The first property to consider is their electrical potential. All metals generate a negative voltage (as compared to a reference electrode) when immersed in water. The lower â the more negative - the voltage, the more active the metal is considered to be, for example: Magnesium generates -1.6 Volts, i.e. negative 1.6 volts. Aluminum sacrificial anode alloy generates -1.1Volts.