Even though it may be true, it is a question of aesthetics too. It looks awful, and it is unconfortable to work with, in case of a repair or rewind.Don't worry, oxidation will take centuries to destroy the core. Only a small film of paint or varnish, and go on!.
Nice solution. Yes, satin would probably look great.Get a small can of polyurethane varnish, mix well and brush on a coat. I think satin looks best.
Oil? What kind of oil?Or a coating of light oil if you don't want to paint.
Treat with a light (~5%) solution of H3PO4 (phosphoric acid), lightly applied with a soft brush (don't soak the whole laminations).Hi everyone.
One of my transformers is starting to develop oxide in form of tiny brown dots. The laminations are not covered (only the winding is, with a pair of bells). What do you do to stop this from happening?
Treat with a light (~5%) solution of H3PO4 (phosphoric acid), lightly applied with a soft brush (don't soak the whole laminations).
Leave it to work for ~30 minutes, and wipe the wet residues with dry, absorbing cloth.
If the rust is light, it should do the trick and passivate the metal against further corrosion