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2016

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òîì 14 / 

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Ñêà÷àòü ïîëíóþ âåðñèþ ñòàòüè (â PDF ôîðìàòå)

shunting the magnetic field lines, magnetron sputtering system, erosion zone, aluminide
«Formation of the Nanosize Structures on the Steel Surface When It Is Activated by Acids and Contacted with Radionuclide Solutions»
591–608 (2016)

PACS numbers: 28.41.Te, 61.05.cp, 68.37.Hk, 81.07.Bc, 81.70.Pg, 82.45.Bb, 82.45.Jn

The effect of acidic activator solutions on the formation of Fe(II)–Fe(III) layered double hydroxides called Green Rust and their phase transformation on the carbon steel surface (St3) are studied applying an X-ray diffraction method, thermal analytical measurements, and scanning electron microscopy. According to experimental data, the main product of the phase-transformation process within the H2SO4 activator is magnetite with an insignificant admixture of ferric oxyhydroxides, but the usage of HCl, HNO3 or CH3COOH acids led to predominant obtaining of lepidocrocite with relatively small amount of magnetite. Whereas the hydroxysulfate Green Rust II is determined as a primary mineral phase in the first case (with H2SO4), only hydroxycarbonate Green Rust I structures are presented in SEM images in the second case (with HCl, HNO3 or CH3COOH). For the purposeful obtaining of GR(Cl–), GR(NO3–), GR(CH3COO–) structures on the carbon steel surface, the phase-formation process must be carried out in an inert atmosphere. The contact of non-oxidized and oxidized St3 with radionuclide water solutions displays the differences in the phase composition of the surface nanostructures. Whereas the usage of non-oxidized St3 leads to the formation of magnetite nanoparticles, the main phases on the oxidized St3 are iron oxyhydroxides. The following water solutions: CsCl, Sr(NO3)2, and Th(NO3)4 are chosen as the imitators of radionuclide-containing dispersion medium. The chemical treatment of the steel surface as the material of containers by sulfuric acid permits to decrease the corrosion rate of glazed high-active wastes in the deep geological storage.

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