Sodium carbonate is one component of the best technique for dealing with rust - electrolytic de-rusting.
But if they can't work it out with Google and any local hardware shop or even supermarket (washing soda just isn't that hard to find), then there's little hope for the OP.
But the OP did say, and I quote: "sodiam carbonate/water/car battery", which made it look to me like he was planning to put 'sodiam carbonate' (sic) in a car battery, for some de-rusting purpose. Hence the warnings that I gave about H2SO4. It turns out he had a reasonable plan, but he did ask his question in a somewhat daft way.
R.
From patronisingly correcting grammar to...
"F*ck off and die arsewipe."
What a nice fellow.
RedOnRed wrote
We're not at our most friendly tonight, are we? The first few responses were pretty cantankerous, too.
In message , mike writes
Probably related to the only semi-intelligble posting of the OP
Actually it will, I use it quite a lot as the electrolyte when removing rust using electrolysis and it is a very effective technique.
Thank you for the Asda tip. I'll have a drive out. Where I live the tesco/sainsburys etc often have things out of stock. We are lucky to get cheddar cheese some days. Thanks also for the web link and that the system has been tried before.
Now, why oh why all the flack & unkind comments. Do some people enjoy getting the wrong end of the stick and then hitting the person with it.
Thanks again for the helpful comments
A good rust removing acid is Phosphoric Acid. I have seen it referred to as a food acid. It is or used to be in Coca Cola.
A good solution is 50% Phosphoric Acid, 50% Acetone and a few drops of Fairy Liquid to act as a surfactant.
Chris.
Phosphoric acid won't remove any rust at all. It will convert some of it to phosphates (or tannates, depending on formulation). It's OK if you just want a stable black surface to paint over, but sometimes you want it removed.
Why mix it with acetone? What's the purpose?
If you'd included a term like "electrolysis" in your original post there may have been less confusion. However, the people who got the wrong end of the stick and ridiculed you do look rather stupid.
Sure I had that to drink in wine bar in London last night
Washing soda? Normally get mine from pretty much any supermarket - a common brand is "DP Crystals". About 50p a bag IIRC - located usually by washing powders etc.
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