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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.
Traditionally, many vessels are fitted with sacrificial anodes for hull protection. The steel of a structure is protected when sacrificial anodes of a less noble metal are attached to the structure. Two different alloys are particularly suited for doing this in a cost-efficient way: zinc alloys and aluminium alloys.