Does anyone know whether submarines have sacrificial anodes? I know that boats generally have these big blocks of zinc bolted to their hulls somewhere and the electrochemistry of rusting means that the zinc corrodes away first in preference to the steel. Then, when the zinc's all gone, simply bolt on a new block.
I know you still get surface rust on steel, but the anodes mean that it remains on the surface and doesn't eat into the bulk of the metal. I guess in u-boats, the anodes could have been attached to the pressure hull inside the water fairings (assuming the pressure hull is seperate of course)?
|