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Bob Clinkenbeard wrote:
When I purchased them the PO had them stored outside under trees. Because
of that, there are a few (maybe 8-10) spots of pitting on each tank where
they were sitting on wood supports....of course.
My question is...what can I do to be sure the pitting is stopped.
REPLY
Since the pitting is on the bottom, chancea rea you would not be able to see
them after installation.
That woul dmake inspection impossible until a leak developed.
Best bet would be to have the pits welded and ground flat using the correct
alloy welding rod.
Otherwise you need to remover the surface material to raw metal and then use
somethign like Devcon to fill the voids.
Whaterver the cost is now to make it right is a small pecentage of what it
will cost should the tank perforate later on.
Someone mentioned crevice corosion.
Crevice corosion is normally something associated with stainless steel.
Crevice corrosion begins when the surface is in contact with water depleted
of oxygen.
Aluminum corrodes by a different process.
In the case of damp wood in contact with the tank surface the interaction of
the alkaline wood is the causitive agent.
Arild
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