Homebrew version of hammerite rust remover dip ?

[Ribenapigeon]

I bought some hammerite rust remover dip to get the rust off some tools in restoring. It works fine but is pricey. Is there a homebrew version? There's no clue on the bottle as to the active ingredients.

Cheers.

[barrkel]

Active ingredient is probably an acid. There's lots of articles on the web about using various acids to remove rust.

Of course, there's other techniques, like electrolysis.
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[MarJay]

I think there is some rather complex chemistry involving chelation and stuff like that, I doubt you could make some at home.
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[Ribenapigeon]

I just cleaned up a piece after soaking it overnight. Its worked well. Something I noticed was a steel part had taken on some copper colour as if plated. Part of the thing I dipped is brass. So some sort of electrolytic process has occurred. If the solution is an acid would that have created copper salts then some potential difference between the brass and steel caused some electroplating?

[DrSnoosnoo]

Coca cola works well. Just soak shit in that. Carbonic acid knocks about which can work to get the rust away. In the hammerite gear, the stuff that turns rust black is apparently phosphoric acid.
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[stinkwheel]

Strong hydrochloric acid, (also marketed as spirit of salts) will remove rust (and dissolve metal).

Hot, strong phosphoric acid will remove rust and black anodise bare metal.

Electrolysis will loosen/remove rust very effectively but not in the way you think it does.

If you had something pretty rusty, you could do them one after the other. So electrolysis then HCl then Phosphoric acid.

A mate of mine pulled a rusty sidecar chassis out of a river estury. He did it in an electrolysis bath. Went from this:
https://www.ratbike.org/aarrgghh/SSOD/pic_0501.jpg

To this:
https://www.ratbike.org/aarrgghh/SSOD/Detail2.jpg
https://www.ratbike.org/aarrgghh/SSOD/Detail1.jpg
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[barrkel]

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Go for the electrolysis option. You'll most likely have nearly all the stuff needs lying about anyway and it's pretty much set up and forget and really does work.

[Ribenapigeon]

how do you homebrew electrolysis?

[Moo.]

Electrolysis is a bit fiddly, but for sit back a watch...

Look up Molasses rust removal.

Basically dissolve 1 part molasses sugar to 10 parts water, takes aaaages to soak, but its dirty cheap (£1.19 per 500g) forms an acidic solution which eats away...

If you want good results and are willing to spend a bit, look up Deox-C gel or crystals, made by a company called Bilt Hamber. Good results

Most acids will form salts on the surface of the metal afterwards though, these salts attract water, so if its not treated soon (painting, or rust protection) there will be surface rust soon..
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[Ribenapigeon]

[DrSnoosnoo]

[barrkel]

[DrSnoosnoo]

[Ribenapigeon]

[bikenut]

have heard that lemon juice is quite good.......used on the nazi fighter plane in cosford, from the channel..........

will post an article from a mag about home electrolysis......

phosphoric acid is in coke....also Jenolite rust remover........

carbonic acid ( as well as sulphuric and other stuff no doubt ) is in rain fall, acid rain.......
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[bikenut]

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PostPosted: 18:17 - 01 Feb 2015 Post subject: Reply with quote




Boozehawk wrote:

how do you homebrew electrolysis?



Here

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that's the one, article shows rusty mess, the rust removed.......says it leaves the clean article with a black patena coating.......

now to find home electroplating stuff in tin.........or copper......
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