Yes, the plow is eventually Scour, but it may take 20 acres to get it to finally have the soil sliding over clean metal, and the plow will not do a very good job until it is..
You won't see the black layer, as the rust wears off and the soil will stick to that rust like it is glued on (use a Putty Knife often)..
Using the angle-grinder as I described will take the rust OFF, right to that micro-thin Oxide layer under the rust and that WILL not interfere with the plow/Soil contact areas..
Once Scoured (wear-polished) and right after the last use, rub a good thin layer of motor oil on all polished surfaces, then spray cheap Enamel paint over the oil, to hold the oil in place. Or, smear a good coating of grease on all the wearing surfaces..
Scouring a plow can be a PITA, so get it in shape and KEEP it that way..!!
Did you get the plow to penetrate correctly..? Did you have to adjust the rear wheel up.? Ron..
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