Formation of Fe(II)_1-Fe(III)_3 Green Complex on Oxidation of Ferrous Ion in Perchloric Acid Solution

The interaction between Fe(II)-Fe(III) in strong acidic solution has been investigated by means of electronic and Raman spectra, magnetic susceptibility measurement and chemical analysis of the solution. It was found that the green intermediate complex having an absorption band at 337 nm was formed on oxidation of Fe(H_2O)^_6 in perchloric acid solution. The Fe(II)/Fe(III) ratio in the green complex was a third. The configuration of the complex consisting of Fe(II)-O-Fe(III) oxo-bridges was suggested

Spectroscopical Approach to the Mechanism of the Rebinder Effects in MgO Immersed in N, N-dimethylformamide or Dimethylsulfoxide

The mechanism of the Rebinder effects is proposed from a point of view of the formation of barrier against the dislocation movement caused by strong chemisorption. The infrared and electronic spectra of N, N-dimethylformamide or dimethylsulfoxide adsorbed on MgO indicate that the adsorption may be accompanied by a charge transfer from these compounds to MgO. The proposed mechanism can explain the difference of the near-surface dislocation mobility in MgO immersed in N, N-dimethylformamide or dimethylsulfoxide

The Mechanism of Atmospheric Rusting and the Effect of Cu and P on the Rust Formation of Low Alloy Steels

The oxidation processes of Fe(II) hydroxo-complexes to α-, β-, γ-, and δ-FeOOH and Fe_3O_4, which are important atmospheric products of steels, and the effect of Cu^, PO^_4 ion on the oxidation of the Fe(II) hydroxo-complexes in aqueous solutions have been investigated. The mechanism of atmospheric rusting deduced from the results obtained in the present investigation has been used to explain the difference in behaviour between ordinary mild steels and low alloy steels during atmospheric exposure. It is concluded that Fe(II) complexes are transformed to amorphous δ-FeOOH by the catalytic effect of Cu and P present in steels. The amorphous δ-FeOOH forms a compact rust layer that enhances corrosion resistance of the steel