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 - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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