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  • 1
    Electronic Resource
    Electronic Resource
    Electrochemical behaviour of iron in alkaline sulphate solutions (1974)
    Springer
    Journal of applied electrochemistry 4 (1974), S. 337-345 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The electrochemical behaviour of pure iron in alkaline sulphate solutions was studied using cyclic voltammetry atT = 298 K. It has been found that the results depend on the polarization pre-treatment of the electrode and the activation state of its surface. At starting potentials in the range of hydrogen evolution and at maximum activation conditions, the voltammograms show three anodic current maxima and two cathodic ones. A correlation between these different maxima is given. The electrode processes, which may take place at these maxima, are discussed in terms of possible iron dissolution mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00608976
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of lead and thallium underpotential adsorbates at silver single crystal surfaces on different redox reactions (1979)
    Springer
    Journal of applied electrochemistry 9 (1979), S. 161-169 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The influence of underpotential Pb- and Tl-adsorbates at rotating disc silver single crystal surfaces (111), (100), and (110) on the kinetics of ‘outer-sphere’ and ‘inner-sphere’ redox reactions was studied in 0.5 M NaClO4 and 0.5 M Na2SO4 solutions (2 〈 pH 〈 4) containing Fe3+, Ce4+ or NO 3 − ions. While the reduction of Fe3+ and Ce4+ under limiting diffusion conditions was not affected by the metal adsorbates, a strong inhibition effect correlated to the degree of Pb- or Tl-adsorbate coverages was observed in the case of the reduction process in the presence of NO 3 − ions. The results are interpreted in terms of a strong chemical interaction between the reactant or a reaction intermediate and the silver substrate, taking into account the previously proposed superlattice structures of the metal adsorbates, depending on the orientation of the silver single crystal surfaces and on the underpotential range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616086
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  • 3
    Electronic Resource
    Electronic Resource
    Electrochemical impedance spectroscopy on porous electrodes (1990)
    Springer
    Journal of applied electrochemistry 20 (1990), S. 677-685 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Electrochemical d.c. and a.c. measurements have been carried out on porous Raney nickel in H2-saturated 0.1 M, 1 M, and 6 M NaOH solutions atT=303 K and 333 K using rotating-disc and static-plaar electrodes. For comparison, measurements were also performed on graphite-cloth and graphite-felt electrodes. From polarization curves and current transients obtained in the potential range of the hydrogen evolution and hydrogen oxidation reactions the dependence of the electrocatalytic activity of Raney nickel on the prepolarization conditions was studied. Impedance spectra in the frequency range 1 mHzf 10 kHz were used to determine the characteristic pore parameters and to identify the kinetic behaviour of the porous electrodes by application of transfer function analysis using non-linear fit routines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01008882
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  • 4
    Electronic Resource
    Electronic Resource
    In-Situ Untersuchung von Korrosionsvorgängen an inhomogenen Werkstoffoberflächen mit Hilfe von EISHerrn Prof. Dr. rer. nat. Dr.-Ing. E. h. Heinz Spahn zum 65. Geburtstag gewidmet (1991)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 22 (1991), S. 153-167 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Der Einfluß von Oberflächeninhomogenitäten verschiedener Dimension (0-D, 1-D, 2-D, und 3-D) auf Korrosionsvorgänge an Werkstoffoberflächen wird erläutert. Daraus resultierende lokale Korrosionserscheinungen werden üblicherweise mit Hilfe von oberflächenanalytischen Methoden ex-situ charakterisiert. Eine in-situ Charakterisierung lokaler Korrosionsvorgänge, vor allem im Frühstadium, ist mit konventionellen elektrochemischen Untersuchungsmethoden meist nicht möglich. Die moderne Elektrochemische Impedanz-Spektroskopie (ESI) hat sich dagegen als geeignete in-situ Meßtechnik bewährt, lokale Korrosionsvorgänge an inhomogenen Werkstoffoberflächen zerstörungsfrei, rasch und zuverlässig aufzuklären. Die Einsatzmöglichkeiten von EIS werden anhand ausgewählter Beispiele aufgezeigt und diskutiert.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19910220502
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  • 5
    Electronic Resource
    Electronic Resource
    Vorwort (1980)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 31 (1980), S. 339-339 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19800310502
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  • 6
    Electronic Resource
    Electronic Resource
    Zum Aktiv-Passiv-Übergang von Metallen (1983)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 34 (1983), S. 290-294 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Active-passive transition of metalsThe importance of the Flade potential on the active-passive transition of metals is critically reconsidered. In contrast to previous results on iron it will be shown that this transition is a continuous process. Based on a kinetic model for the iron dissolution and passivation, a new interpretation of the active passive transition is given by which the previous thermodynamic interpretations of the Flade potential and its inconsistencies with experimental results is replaced.
    Notes: Die Bedeutung des Flade-Potentials für den Aktiv-Passiv-Übergang von Metallen wird einer kritischen Betrachtung unterzogen. Im Gegensatz zu früheren experimentellen Befunden wird gezeigt, daß dieser Übergang kontinuierlich erfolgt. Auf der Grundlage kinetischer Modellbetrachtungen wird am Beispiel der Eisenauflösung eine Neuinterpretation des Aktiv-Passiv-Überganges vorgeschlagen, wodurch die ursprünglichen thermodynamischen Interpretationen des Flade-Potentials mit den damit verbundenen Diskrepanzen gegenstandslos werden.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19830340604
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  • 7
    Electronic Resource
    Electronic Resource
    Bedeutung der Dynamischen Systemanalyse für Korrosionsuntersuchungen in Forschung und Praxis (1985)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 36 (1985), S. 120-130 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Importance of the dynamic system analysis for corrosion testing in research and practiceFor an optimal selection of structural materials in practical applications it is important to obtain a detailed knowledge of the dynamic corrosion behaviour of the system. The background of the dynamic system analysis and its parameters are derived in the first part of this paper. The different experimental procedures and principal problems in the interpretation of experimental results are discussed. In the second part different methods of analysis of impedance data are described for simple corrosion systems. Characteristic results for various corrosion inhibitors and coated metals during exposure to corrosive environments which are of importance for basic research as well as for practical applications are discussed in the third part.
    Notes: Voraussetzung für einen optimalen Werkstoffeinsatz in der Technik ist die Kenntnis des dynamischen Korrosionsverhaltens des Systems. Im ersten Teil dieser Arbeit werden die Grundlagen der dynamischen Systemanalyse und ihre charakteristischen Kenngrößen dargestellt. Die verschiedenen Meßmethoden und prinzipielle Probleme bei der Interpretation der Meßergebnisse werden diskutiert. Im zweiten Teil werden für einfache Korrosionssysteme verschiedene Auswerteverfahren behandelt. Im dritten Teil werden charakteristische experimentelle Ergebnisse für verschiedene Korrosionsinhibitoren und beschichtete Metalle, die von Bedeutung für Korrosionsuntersuchungen in Forschung und Praxis sind, vorgestellt.
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19850360304
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  • 8
    Electronic Resource
    Electronic Resource
    Anwendung der dynamischen Systemanalyse zur Untersuchung der Sauerstoffkorrosion von eisen in neutralen, belüfteten lösungenHerrn Professor Dr. H. Spähn zum 60. Geburtstag gewidmet (1986)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 37 (1986), S. 377-384 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Application of dynamic system analysis for investigating oxygen corrosion of iron in neutral aerated solutionsThe oxygen corrosion of iron was investigated in neutral aerated sulphate solutions using electrochemical dc and ac methods as well as non-electrochemical solution analysis. In order to interpret the electrochemical impedance spectra, a physical model was developed and its theoretical transfer function was discussed. The optimum fit of the theoretical transfer function to the experimental data gave system-specific parameters characterizing quantitatively the corrosion rate in the presence of porous 3-D layers and the mechanism of interphase inhibition by added 1,6 hexane-biphosphonic acid.
    Notes: In neutralen, belüfteten sulfathaltigen Lösungen wurde die Sauerstoffkorrosion von Reinsteisen mit Hilfe stationärer und dynamischer elektrochemischer Messungen sowie nichtelektrochemischer Lösungs-analyse untersucht. Zur Interpretation der elektrochemischen Impedanzspektren wurde ein physikalisches Modell entwickelt und dessen theoretische Transferfunktion diskutiert. Optimale Anpassung der theoretischen Transferfunktion an die experimentellen Daten lieferte charakteristische systemspezifische Parameter, die über die Korrosionsgeschwindigkeit in Gegenwart von porösen 3-D Deckschichten und den Wirkungsmechanismus von 1,6 Hexan-biphosphonsäure als Interphaseninhibitor quantitative Aussagen erlauben.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19860370702
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  • 9
    Electronic Resource
    Electronic Resource
    Einfluß des Metallsubgefüges auf den anodischen Auflösungsmechanismus von Eisen (1974)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 25 (1974), S. 86-92 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Influence of the metal substructure on the anodic dissolution mecanism of ironThe electrochemical behaviour of iron shows a pronounced dependence on the metal substructure. The surfaces formed at the rupture of the specimens are dissolved according to a non-catalytic mecanism while a heat treatment of these rupture surfaces produces a change in the mechanism so that the dissolution occurs according to a catalytic mechanism. The two mechanisms are characterized by a rather different dissolution potentials; these differences can be attributed to the state of deformation of the crystal latice.
    Notes: Das elektrochemische Verhalten von Eisen ist in ausgeprägtem Maße vom Metallsubgefüge abhängig. Die beim Bruch der Proben entstandenen Flächen werden nach einem nichtkatalytischen Mechanismus aufgelöst während eine Wärmebehandlung dieser Bruch-flächen zu einer Anderung des Mechanismus führt und die Auflösung dann katalytisch erfolgt. Die beiden Mechanismen sind durch stark unterschiedliche Auflösungspotentiale charakterisiert; diese Unterschiede können dem Verzerrungszustand des Kristallgitters zugeschrieben werden.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19740250204
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  • 10
    Electronic Resource
    Electronic Resource
    Struktur-Wirkungs-Prinzipien von Korrosionsinhibitoren für die Rohöl- und ErdgasförderungHerrn Prof. Dr. W. Hilger zum 60. Geburtstag gewidmet (1989)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 40 (1989), S. 629-634 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Structure efficiency relationships of corrosion inhibitors for oil and gas productionStructure efficiency relationships for quarternary ammonium compounds as corrosion inhibitors for oil and gas production were investigated in the system mild steel/aqueous NaCl solution (5 weight%, CO2 saturated) at T = 298 K and T = 343 K by Electrochemical Impedance Spectroscopy (EIS) and weight loss measurements. In-situ EIS measurements rapidly gave relatively accurate results on differential inhibitor efficiencies. Composition, thickness and inhibitor content of the inhomogeneous 3-D protecting layers formed on highly pure iron surfaces were determined by XPS measurements. The inhibition mechanism of the inhibitor used could be determined by its distribution within the 3-D protecting surface layer and is interpreted in terms of the interphase inhibition concept.
    Notes: Struktur-Wirkungs-Prinzipien von quartären Ammoniumverbindungen als Korrosionsinhibitoren für die Rohöl- und Erdgasförderung wurden anhand von Elektrochemischer Impedanz Spektroskopie (EIS) und Gewichtsverlustmessungen in Systemen C-Stahl/wäßrige NaCl-Lösung (5 Gew.%, CO2-gesättigt) bei T = 298 K und T = 343 K untersucht. Es konnte gezeigt werden, daß in-situ EIS Messungen rasch relativ genaue Resultate über differentielle Inhibitorwirksamkeiten liefern. Aus XPS Untersuchungen an Oberflächen aus Reinsteisen ließen sich Zusammensetzung, Dicke und Inhibitorgehalt der sich auf dem Substrat bildenden inhomogenen 3-D Deckschichten bestimmen. Der Wirkungsmechanismus des verwendeten Inhibitors konnte aus seiner Verteilung innerhalb der 3-D Deckschicht mit dem Konzept der Interphaseninhibition gedeutet werden.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19890401102
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