用穆斯堡尔效应研究了α—Fe和铁锈的各主要组份(α-,γ-,δ-,am-FeOOH;α-,γ-Fe_2O_3和F_3O_4)与商品磷酸系锈控涂料主要活性组份—20％磷酸酒精液的作用,结果表明除Fe_3O_4的作用产物系三价铁无定形磷酸盐外。其余产物都为酸式磷酸盐FeH_3(PO_4)_2·2 1/2H_2O。另外,在Fe_3O_4和在α-Fe的反应产物中还存在多种高自旋二价铁的产物。环境中的NaCl及H_2O会不同程度地改变上述反应产物的结构,而O_2对二价铁磷酸盐变成三价铁磷酸盐是必须的。作者用形核长大和高聚物聚沉两种不同沉淀机制对以上结果作了解释。
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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