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Attention: fisherman and boat owners out there. 

It is a good idea to use anodes to protect your metal boat hull, metal crab pots, salt water-cooled marine engines, yacht propellers, In seawater applications zinc anodes are the go. 

 

Boat

 

Legend has it that Noah's Ark was fitted with strips of dissimilar metals in parallel lines on its hull so that once in the water an electrical current flowed on electric shock. When wooden ships started sailing into the tropics marine worms and other sea creatures would attach themselves to the hull and eat their way through. Eventually the ships would become porous and sink. The shipwright countered this by nailing copper sheeting to the ships hulls but they used iron nails. Once in the seawater, galvanic corrosion would attack the least noble metal, the iron nails. The copper sheeting would then just fall off and the wood would be exposed. When the copper strips were delivered to the shipyards to be nailed onto the hulls of ships it was noticed that the copper sheets were wrapped in a tar paper, sometimes this was removed and sometimes not before nailing it to the hull. 

When the ships were hauled out of the water it was noticed that the copper strips were still attached to the hulls of the ships that hadn't had the tarpaper removed, because the tarpaper insulated the iron nails. When iron ships became common, anodes were fitted to the hulls, but although the ships were fitted with sacrificial anodes that allowed the ship to last longer, the resistance of anodes on the otherwise smooth hulls caused the ships to use more fuel. With new technology anodes are now shaped aqua dynamically to reduce frictional drag while ships travel through the water. Please call us with your details for a quotation