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Vinegar and salt

Anonymous Fri 03 Sep 02:10:55 2021 No.13597111 View Reply Original Report

Quoted By: >>13597136 >>13598816

Okay stupid question but why does vinegar and table salt work well for cleaning rust off of metal?

Why does adding salt make it work so much better?

Anonymous

Anonymous Fri 03 Sep 2021 02:15:52 No.13597136 Report

Quoted By: >>13597163 >>13597176

>>13597111
ions from the salt like to bond to the iron oxide, and so does the acid in vinegar. by increasing the local oxidation with a solution it becomes easier to remove the already rusty flakes, though you should beware as they are rust accelerants, they work for cleaning because you're selectively furthering the oxidization reaction.

Anonymous

Anonymous Fri 03 Sep 2021 02:21:09 No.13597163 Report

Quoted By: >>13597182

>>13597136
Is that what any acid would do?
Would it be better to use a HCL solution?

Just weirded me out because I've done it before and it is taken off what I could only describe as a God forsaken amount of rust and left it looking clean and new.

It was just so much more than I expected from something as weak as vinegar so I assumed it was something other than an acid reaction

Anonymous

Anonymous Fri 03 Sep 2021 02:23:55 No.13597176 Report

Quoted By: >>13597183

>>13597136
After cleaning, if it is possible, apply a barrier so that oxygen can't reach the metal.

Anonymous

Anonymous Fri 03 Sep 2021 02:25:23 No.13597182 Report

Quoted By:

>>13597163
In terms of types of acid, its strength depends on the type of acid and its molarity.
I would be fine gulping 0.1 M HCl, but if you did the same with 99% vinegar you'd die.

Anonymous

Anonymous Fri 03 Sep 2021 02:25:24 No.13597183 Report

Quoted By: >>13597198

>>13597176
What I did the first time is cleaned it, soaked it in baking soda to neutralize what was left and get rid of the smell, and then soaked it in mineral oil to protect it.

Anonymous

Anonymous Fri 03 Sep 2021 02:29:49 No.13597198 Report

Quoted By: >>13597207

>>13597183
so long as you gave it a rinse in DI and removed any moisture before the oil dunk sounds good to me.

Anonymous

Anonymous Fri 03 Sep 2021 02:32:32 No.13597207 Report

Quoted By: >>13597243

>>13597198
Wouldn't oil displace the water?

I guess my main question is is it simply working because it is an acid? Or is there something more at play Because I can just as easily dilute some 32% HCl down to whatever I need I'm only using the vinegar salt method currently because I know it works but I'm not sure why

Anonymous

Anonymous Fri 03 Sep 2021 02:41:15 No.13597243 Report

Quoted By: >>13597289

>>13597207
Water can get trapped in small holes and wedges of the metal, especially as it's been previously damaged with rust. It's the same reason a rinse in the shower doesn't strip you of all the oils on your skin.
As for why salt and vinegar works, the first poster described it very well. I'm not sure why you'd use HCl since vinegar is much more readily available.

Anonymous

Anonymous Fri 03 Sep 2021 02:54:01 No.13597289 Report

Quoted By: >>13597354 >>13598823

>>13597243
Because HCL is very available for me.

Haven't really played with it much for rust removal because I was worried it might be too much and actually damaged the tools or some shit and make them weaker. I got a shitload of rusty tools and I just want whatever is going to be the best to clean them and if it's just an acidic reaction I guess I can dilute some HCL or something, I was just under the impression that it was something different than that because I wouldn't expect 5% acetic acid to work so damn well even with some salt in there

Anonymous

Anonymous Fri 03 Sep 2021 03:12:29 No.13597354 Report

Quoted By:

>>13597289
wikipedia says hcl is good for removing rust, id try it on a smaller spot first in case its too strong.

ditch the salt completely though, its directly more corrosive to iron than a partially diluted acid

Anonymous

Anonymous Fri 03 Sep 2021 12:49:25 No.13598577 Report

Quoted By:

What is WD-40?

Anonymous

Anonymous Fri 03 Sep 2021 13:57:51 No.13598816 Report

Quoted By:

>>13597111
Steel mills dunk their fresh steel ingots in acid solutions to wash of the rust. Its a chemical reaction, with vinegar rust turns into iron III acetate, a soluble salt, with HCL it makes iron III chloride

Anonymous

Anonymous Fri 03 Sep 2021 14:00:21 No.13598823 Report

Quoted By:

>>13597289
HCL is good. I have cleaned many heavy rusty steel plates inside large trays with dilute HCL. You turn them a bit so they get wet everywhere. Then you transfer them fast to a tray with a baking soda or caustic soda solution to neutralize the acid. You them must wash and dry and cover with some oil or just let the caustic soda dry on them.

Anonymous

Anonymous Fri 03 Sep 2021 14:23:35 No.13598906 Report

Quoted By:

I use citric acid, no salt

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