Well, George, as 007 says, phosphoric acid does not convert rust back to iron. It converts it to iron phosphate, which is a stable, corrosion resistant substance that makes an excellent base for paint. If you remove the black phosphate coating, then you're back to steel. Phosphate coatings are used on military hardware, particularly firearms, due to their corrosion resistance and non-reflective appearance.
If you want to convert rust back to iron, you need to use electrolysis, a topic that comes up from time to time.
I use phosphoric acid (aka Ospho) quite a bit. I've found the best results are when there's just a little rust remaining on the steel. Clean metal doesn't react as well as rust, while heavy rust needs to be cleaned up a bit.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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