Andina* has considerable expertise in Marine Electrolysis
>, and should have an informed opinion on this subject.
* Cruisers & Sailing Forums - View Profile: Andina
In my experience, general detachment (peeling in sheets) of bottom paint
(on FRG hulls) suggests that the prep work was faulty, the paint
was applied too thickly, or multiple coats were applied too quickly.
is caused when an external (Stray) current finds a path between two metals in the presence of an electrolyte. The two metals may be of exactly the same type or different types.
Electrolytic currents can generate chlorine gas, which may cause blistering of the surrounding antifouling paint
. However, Iíve never seen it cause extensive (generalised) peeling, though it may so do.
occurs when two dissimilar metals are in contact with each other, in the presence of an electrolyte, such as seawater.
Any time you have two different metals that are physically or electrically connected and immersed in seawater, they become a battery
. Some amount of current flows between the two metals. The electrons that make up that current are supplied by one of the metals giving up bits of itself-in the form of metal ions-to the seawater.
The most common casualty of galvanic corrosion is a bronze or aluminum propeller
on a stainless steel
shaft; but metal struts, rudders, rudder
fittings, and aluminum saildrive
, & stern drives are also at risk. Under no circumstances should antifouling containing cuprous oxide biocide be applied to aluminum hulls nor drives.