There was a recent thread on using vinegar to remove rust. I commented that soaking rusty parts in Coca-Cola could convert rust to a phosphate coating because Coke contains phosphoric acid. Someone said he tried it and it did not work. I think we are dealing with two issues. First, a chemical reaction takes time to work. Second, the concentration of phosphoric acid in Coke is very low. I tested some rusty parts (pic 002) for one day (pic 004) and for three days (pic 006)
My picture quality is not good, but if you look at the very rusty piece of pipe you see a big difference after one day and a pretty nice phosphate coat after three days. I wanted to prove my point ....however, ... I would not mess with Coke for rust removal. Buy a product with a high concentration of phosphoric acid designed for the purpose. It will produce a much thicker, harder coating.
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