I have heard that aluminum boats are especially sensitive to the installation of cathodic protection systems. Can I use impressed current to protect this type of boat?
ANSWER 13: You can absolutely use these protection systems for aluminum boats as long as the following precautions are taken. Aluminum, like all metals, has its own characteristic minimum protection value, in this case the value is -900mV (-650mV for bronze/stainless steel, -800mV for steel, as measured by a Silver – Silver-Chloride electrode). The greatest problem with protecting aluminum is overprotection by exceeding the determined safe value (between -1200mV and 1300mV). The PH basis that would develop due to overprotection would attack the aluminum chemically and would corrode the metal even faster than through normal corrosion.
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