this might seem like madness but depends on how much time you have to experiment and get it right... the results can be great.
do you have access to a big none metal tank some rebar and a battery charger or school laboratory power supply (adjustable)?
kids paddling pool springs to mind and an industrial sized sack of washing soda.
suggest you pump it out down the drain when done, otherwise it will kill the grass.
do this out doors and don't smoke, hydrogen gas can be a bit exciting when flames and sparks are around... think hindenberg. well think of the precaustions you would take when chareging a car battery...... that more like it.
electrolysis in a water/washing soda bath will bring most if not all of that off provided the surface isn't greasy.
you want your part lifted off the floor of the container and the part you want to de rust. submerged. you can do this is sections
the rust is removed faster in areas closest to the rebar so moving it around or building a ring around the item works best
https://www.familyhandyman.com/project/ ... ctrolysis/
the part is always connected to the negative with a jump lead or some such, and the positive is connected to the rebar, the steel or iron annode in the set up.
if you had to use a steel bath
make sure its not galvanised
+ to the bath
- to the wing
and make sure the wing does not touch the bath, stand the wing on plastic boxes so it doesn't touch the steel bath
the other option is:-
Phosphoric acid solution.
gloves and eyes...!!
but buying any chemical in quantity as a private individual can be a bit of a bind.... they think drugs, violent thug or terrorist. expect to have to prove you are who you say you are.....
https://www.azureliquidsolutions.co.uk/ ... rfaces-5l/
you could probably wash this on with the wing standing in a tray
use a hand held spray pump, like the one bathroom cleaner comes in.... keep wetting it down and scrrubbing with a brush
as i say gloves and eye protection needed, and potentially a pinny so you don't end up with extra holes down the front of your shirt.
its not HCL or h2SO4 bad... as in STRONG acid, but its still an acid (used in diluted form in Coke..!!! only the real thing)
pour the run off into a can and use it again to Bananarama! on.
keeping your work area wetted for 15 minutes should see results and your rust remover turning orange.
that way you don't need to buy enough for total submersion
used it on rusty bits of steering box and a load of nuts n bolts and worked well.
id suggest dogs cats wildlife and children should be kept out of the way away in both cases and ventilation is key...
other option is to mix in some polycell wallpaper paste and smear your acidc cocktail on as a gell, cover the wing in cling film once you have slimed it, and come back tomorrow and hose it off
might take more than one application becasue although polycell is a wetting agent the gloop doesn't migrate as well into all nooks and crannies.
oxaclic acid could be used instead of phosphoric if its cheaper, just takes abit longer
HCL (spirit of salts) is dangerouse, will take the rust off in minutes, expect white fumes. trouble is by the time you have neutralised it and washed the part down it has flash rusted before your eyes. and you get a problem linked to surface embrittlement so don't use on the bolts that hold anything vital on to the car.
best avoided... but sold in Robert Dyas, handy if nothing else will do.. gets oil/ blood stains off block paving and removes skin, really hurts if you get a hole in your glove, and makes holes in your jeans. Best used sparingly, watered down 50:50 to clean out rusty motor bike fuel tanks that you can then fill quickly with bicarb solution to the brim for a few days to neutralize, and then slosh round with motor/2 stroke oil. did it once it worked, probably won't do that again. the fumes were also pretty awful. and what do you do with it when your finished?? yes they aint going to take the waste at the local tip.
Dave