Originally Posted by gunnado
I was asked by a client today if this green stuff is from stray currents?
70s timber trawler
and the picture is of the stuffing box.
Is this normal corrosion
? Is there a solution?
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Brass is made form Zinc & Copper. Copper oxidizes and is accelerated by salt
In one sense a "coating" of copper oxide is good - as the corrosion process requires air to continue oxidizing and once a nice coating of oxide is on it in "theory" it stops oxidizing - yup...
I prefer not to have green corrosion on all my stuff and I don't like not knowing what is going on under the oxide especially as the thing keeps the ocean out of the boat.
I would clean it - a mild acidic like vinegar can help.
If you don't seal it - i.e. clear coat paint
. It will eventually corrode again. Ultimately over the years until it needs to be replaced.