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Abstract The reactions of two typical commercial phosphoric acid series rust control coatings with both α-Fe and rust (α-,γ-,δ-,am-FeOOH; α-, γ-Fe_2O_3 and Fe_3O_4)have been studied by Mossbauer spectroscopy. Since the active ingredient of the coatings is phosphoric acid, a 20％ H_3PO_3 alcoholic solution is adopted in place of the real rust control coatings. It is shown that, with the exception of the product for Fe_3O_4 being Fe(Ⅲ) amorphous phosphate, those for α-Fe and almost for all of the rest iron oxides and iron oxyhydroxides are iron acid phosphate FeH_3(PO_4)_2·2 1/2 H_2O. In addition to Fe (Ⅲ) products, various highspin Fe(Ⅱ) products have also been found in the products for α-Fe and Fe_3O_4. The process and the structure of the reaction products have been influenced by salt,water etc. from the environment. For the transfortion of Fe(Ⅱ) phosphate to Fe(Ⅲ) phosphate, sufficient O_2 is required. The results obtained is explained by two different precipitation mechanisms, namely, nucleating growth and high polymers aggregation.
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Received: 25 August 1988
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