26-08-2021, 07:38 AM
I'm just messing about here, but I have an old pre ww2 radio chassis (PYE) that I can't bring myself to bin, so seeing this thread I thought I'd do a few small test pieces, the first is a small pulley block dug up out of the garden, (it was so rusty it was unidentifiable), it has come up pretty well, but with a few patches of scale untouched.
The boiler guy said that the milder chemicals work fine just take longer, but for the incomplete cleaning soak and scrub in sodium carbonate firsthand to degrease as Cleggy suggested, then rinse, do your acid soak, then rinse and scrub in the soda again, then rinse... To protect I'm now thinking the surface could have phosphoric acid applied.
I don't know what would end up left of this chassis, but the finished is all gone and there is flaking rust in places.
The boiler guy said that the milder chemicals work fine just take longer, but for the incomplete cleaning soak and scrub in sodium carbonate firsthand to degrease as Cleggy suggested, then rinse, do your acid soak, then rinse and scrub in the soda again, then rinse... To protect I'm now thinking the surface could have phosphoric acid applied.
I don't know what would end up left of this chassis, but the finished is all gone and there is flaking rust in places.
