0000000000291437

AUTHOR

Cs. Vértes

showing 7 related works from this author

Conversion electron Mössbauer study of low carbon steel polarized in aqueous sulfate and sulfite containing sulfate solutions

1993

Abstract The passivation of low carbon steel was studied in aqueous solutions of 0.5 M Na 2 SO 4 (pH = 3.5 and 6.5) and of 0.5 M Na 2 SO 4 + 0.001 M NaHSO 3 (pH 3.5 and 6.5). The used conversion electron Mossbauer spectroscopy (CEMS) with the complementary electrochemical, microscopic and spectrophotometric investigations proved that the presence of sulfite ion induces pitting corrosion. The compositions and thichnesses of the passive films formed during the electrochemical treatments are determined from the conversion electron Mossbauer spectra. γ-FeOOH was found in each case as a major component. At pH = 3.5, the sextet belonging to Fe 3 C appears in the spectra in most cases, and also Fe…

Aqueous solutionCarbon steelGeneral Chemical EngineeringInorganic chemistryengineering.materialElectrochemistrychemistry.chemical_compoundSulfitechemistryConversion electron mössbauer spectroscopyMössbauer spectroscopyElectrochemistryengineeringPitting corrosionSulfateElectrochimica Acta
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A study of thin surface layers by multilayer Mössbauer spectroscopy /MMS/

1990

A stacking Mossbauer technique, MMS has been applied for studying thin surface layers. The surface layers formed on the57Fe film in aqueous solutions of corrosion inhibitors, such as zinc phosphate and barium metaborate, and in distilled water was studied by this method. It has been found that the corrosion is much slower in the presence of zinc phosphate and barium metaborate. XPS analysis suggests the formation of a mixed iron zinc phosphate on the surface of the57Fe film after corrosion in a zinc phosphate solution.

Aqueous solutionHealth Toxicology and MutagenesisInorganic chemistryPublic Health Environmental and Occupational HealthZinc phosphatechemistry.chemical_elementBariumZincPollutionAnalytical ChemistryCorrosionchemistry.chemical_compoundCorrosion inhibitorNuclear Energy and EngineeringchemistryX-ray photoelectron spectroscopyRadiology Nuclear Medicine and imagingThin filmSpectroscopyJournal of Radioanalytical and Nuclear Chemistry Letters
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A Mössbauer study of the crystalline structure of the passive film formed on iron in aqueous sulfate solution containing sulfite in low concentration

1993

Electrochemically induced passivation of evaporated, enriched 57Fe in 0.5 mol dm−3 Na2SO4 + 0.001 mol dm−3 NaHSO3 aqueous solution (pH 6.5) was followed by conversion electron Mossbauer spectroscopy. The transformation of amorphous iron oxide or hydroxide into crystalline γ-FeOOH could be observed with the increase of the polarization time. The comparison of the original quantity of evaporated, enriched 57Fe layer on the surface of the samples with the dissolved iron, measured in the solutions after the polarization, proved the existence of pitting corrosion at this pH.

chemistry.chemical_compoundAqueous solutionchemistryPassivationConversion electron mössbauer spectroscopyGeneral Chemical EngineeringInorganic chemistrySodium sulfateElectrochemistryIron oxidePitting corrosionHydroxideSodium sulfiteElectrochimica Acta
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Electrochemical and conversion electron mössbauer study of corrosion induced by acid rain

1993

Abstract The passivation of low carbon steel was studied in aqueous solution of 0.5M Na2SO4 +0.001M NaHSO3 (pH 3.5, 6.5 and 8.5) which can be considered as a model of acid rain. The used conversion electron Mossbauer spectroscopy (CEMS) with the complementary electrochemical investigations proved that the sulfite ions induce pitting corrosion at pH 3.5 and 6 5 while the measurements showed much weaker pitting at pH 8.5. The compositions and thicknesses of the passive films formed during the electrochemical treatments are determined from the CEM spectra. Only γ-FeOOH was found on the surface of the samples at pH 6.5 and 8.5. Nevertheless, at pH 3.5 the sextet belonging to Fe3C appears in the…

Nuclear and High Energy PhysicsAqueous solutionPassivationCarbon steelChemistryInorganic chemistryengineering.materialElectrochemistryCorrosionchemistry.chemical_compoundSulfiteConversion electron mössbauer spectroscopyPitting corrosionengineeringInstrumentationNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
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Degradation of passive layers of iron studied by conversion electron Mössbauer spectroscopy

1995

Integral electron Mossbauer spectroscopy (ICEMS) and additionally some electrochemical methods were used to characterize the passivation process of iron (low carbon steel) in sulfate, sulfate+sulfite (a possible model solution of acid rain) solutions and in phosphate buffer. The phase compositions and thicknesses of the passive layers formed due to the electrochemical polarizations were analyzed in dependence on the duration of the anodic passivations and on the pH of the used electrolytes. The passive layer, as determined from the Mossbauer spectra, consists mainly of γ-FeOOH, however in sulfite confining sulfate aqueous solution at pH 3.5 Fe 3 C and despite ex-situ circumstances FeSO 4 .H…

Aqueous solutionPassivationHealth Toxicology and MutagenesisInorganic chemistryPublic Health Environmental and Occupational HealthOxideElectrolyteElectrochemistryPollutionAnalytical Chemistrychemistry.chemical_compoundNuclear Energy and EngineeringSulfitechemistryConversion electron mössbauer spectroscopyRadiology Nuclear Medicine and imagingSulfateSpectroscopyJournal of Radioanalytical and Nuclear Chemistry Articles
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conversion electron Mössbauer study of low carbon steel polarized in aqueous sulfate solution containing sulfite in low concentration

1992

The passivation of low carbon steel was studied in aqueous solution of 0.5 M Na2SO4+0.001 M NaHSO3 at pH=3.5 and 6.5. The found major components at pH-3.5 were: γ-FeOOH and Fe3C, and also FeSO4.H2O could be identified on the surface of the low carbon steel as a minor component. At pH-6.5, the passive film contained only amorphous iron(III)-oxide or oxyhydroxide.

Nuclear and High Energy PhysicsAqueous solutionMaterials sciencePassivationCarbon steelInorganic chemistryElectronengineering.materialCondensed Matter PhysicsAtomic and Molecular Physics and OpticsAmorphous solidchemistry.chemical_compoundSulfitechemistryMössbauer spectroscopyengineeringPhysical and Theoretical ChemistrySulfateHyperfine Interactions
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A study of electrochemically-induced corrosion of low carbon steel in a medium modelling acid rain

1994

Complementary electrochemical, spectrophotometric and electron microsopic investigations were made in addition to the conversion electron Mossbauer spectroscopic (CEMS) measurements to learn more about the mechanism of corrosion of low carbon steel samples in aqueous sulfate and sulfite containing sulfate solutions (pH 3.5, 6.5 and 8.5). Passivation of iron in pure sulfate solution was studied in detail in earlier papers. In the present work, we used a solution containing both sulfate and sulfite anions to obtain more information about the effect of acid rain on low carbon steel samples. The compositions and thicknesses of the passive films formed due to the electrochemical treatments were …

Nuclear and High Energy PhysicsAqueous solutionCarbon steelPassivationInorganic chemistryengineering.materialCondensed Matter PhysicsElectrochemistryAtomic and Molecular Physics and OpticsCorrosionchemistry.chemical_compoundSulfitechemistryengineeringPitting corrosionPhysical and Theoretical ChemistrySulfateHyperfine Interactions
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