Abstract
Overprotection is a major problem accompanying cathodic protection of aluminumhulled craft. Investigations were conducted concerning the protection and overprotection of aluminum under various conditions of galvanic coupling, seawater velocities and dilutions, dielectric shield materials, lengths of exposure and influence of seawater location. Overprotection was found to occur above 1500 mv, the exact value depending on seawater velocity and other conditions. The corrosion resulting from overprotection was severe, making imperative a protection system design which eliminates the possibility of accidental overprotection. Data is presented which can aid in the design of a reliable protection system.
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