Galvanic Corrosion can occur in areas of different electrochemical potential in a single piece of metal such as an aluminium plate. Contact with other metals will almost always accelerate corrosion of the Aluminium. Any craft moored and operating in salt or estuarine water is at risk from corrosion and the effects can be costly.
Corrosion on Aluminium vessels can be identified as areas of localised pitting to the hull plate, rudders, bilge keels and particularly in way of weld seams. Pitting can lead to the complete penetration of the hull below the waterline necessitating expensive replating.