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No. It has already oxidized, thus changing it's makeup to Fe2O3 (Iron Oxide). It can be changed to iron phosphate with naval jelly. But that also needs to be treated, cleaned up, and coated with an agent (i.e. paint primer) to stop fast oxidation again. There are two main reasons for using phosphoric acid for rust removal: It dissolves rust at a much faster rate than it dissolves iron, and it leaves a nice iron phosphate coating on the clean metal surface. The reactions are: (a "_" before a number means to subscript the number.)

(1) Fe_2O_3 + 2 H_3PO_4 -----> 2 FePO_4 + 3 H_2O fast

(2) Fe + H_3PO_4 -----> FePO_4 + H_2 (gas) slow possible:Rusted plate can be converted back to a shiney Fe metal thru. use of special anticorrosive primer to convert it back to Fe Metal

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