v8landyman
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25% phosphoric acid is far superior and it will also passivate the surface ready for painting.
White vinegar rust removal
- Thread starter daddy2coull
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Ive just changed non structural ones for stainless - cheap as chips 
Where can we purchase that? Surely that % is for “trade/professional” use only?
Just done a quick google search. It seems the general public can purchase up to around 45%. Every day is a school day!
Chrisw8
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I don’t think I’d be safe with that
At least with pickling vinegar it doesn’t matter if you lick yer fingers....
At least with pickling vinegar it doesn’t matter if you lick yer fingers....
v8landyman
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You can buy 85% phosphoric acid on ebay for about £14/litre. This would make over 3 litres of 25%. I submerge all removed steel parts in 25% overnight. After rinsing they present a grey coating of iron phosphate that inhibits further rusting prior to painting. Although you need to take care with it, phosphoric acid is not a dangerous acid like the main mineral acids, sulfuric and nitric hydrochloric etc.
Much appreciated. I will look into this as the vinegar is taking it’s time with the bits I have in there.
Chrisw8
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Right........
After 2 weeks.......
A quick clean over with wire brush .....
Taaaa daaa
Had one or two lumpy bits of rust still on , but fell off when tapped with hammer.
Not sure if 2 weeks was too long.....calliper metal seemed to have a softness to it as I was wire brushing.
Still, a good experiment.
After 2 weeks.......
A quick clean over with wire brush .....
Taaaa daaa
Had one or two lumpy bits of rust still on , but fell off when tapped with hammer.
Not sure if 2 weeks was too long.....calliper metal seemed to have a softness to it as I was wire brushing.
Still, a good experiment.
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