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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied electrochemistry 23 (1993), S. 606-614 
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The dissolution of inhibitor layers of AHT (3-amino-5-heptyl-1,2,4-triazole) on copper wires in 0.5m H2SO4 was studied by potentiostatic current and capacity transients in a time range from 10 µs to 1000 s. The potential dependent transients show three characteristic regions corresponding to different transfer controlled processes. For short periods an almost constant current of inhibited corrosion through a metastable inhibitor layer is observed. In the second region the dissolution of this layer causes a strong increase in copper corrosion, which was taken as a direct measure of the desorption process. The electrode capacity,C, increases correspondingly. The dissolution itself is not accompanied by a notable charge transfer and, hence, cannot directly be monitored. The last region is dominated by an almost constant active copper dissolution current. The layer dissolution in the second region starts with an inhomogeneous nucleation process. Initially, holes are generated stochastically in the AHT layer and form nuclei of corrosion pits on the copper surface. Based on this model the complete transients can be calculated.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' journal of analytical chemistry 367 (2000), S. 334-339 
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new electrochemical device, the scanning droplet cell, is presented. Small electrolyte droplets are positioned on the sample surface and enable a spatially resolved surface analysis or modification. The droplet is simply held by its surface tension and, therefore, no surface pretreatment is necessary. According to the conventional 3-electrode arrangement all common potentiostatic and galvanostatic techniques, e.g. impedance spectroscopy, cyclic voltammetry, or current transients of potentiostatic steps, are possible.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 256 (1978), S. 183-183 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Ionics 1 (1995), S. 304-310 
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The reversible redox process of electrochemically formed conducting polymers (poly-aniline, poly-3-methylthiophene, poly-carbazole, and poly-bithiophene) was investigated by current transients of potentiostatic steps, impedance spectroscopy, and by mass transients from the electrochemical quartz micro balance. The polymer film thickness (18 nm ≤ d ≤ 6700 nm) and the electrolyte (aqueous H2SO4, HClO4, trichloroacetic acid, and p-toluenesulphonic acid, or non-aqueous acetonitrile/Et4N ClO4) was varied. The redox process is a complex sequence of steps. The oxidation starts with a field supported, non-homogeneous formation of conducting pathes. 5 to 10% of the total charge are sufficient to convert the polymer to the conducting state. Up to 50% of the total charge are consumed by a mechanism which involves proton transport. The further redox process requires a transport of anions from the electrolyte.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Ionics 1 (1995), S. 393-399 
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The initial step of anodic growth of thin oxide films (1 to 100 nm) on Al and Ta is the simultaneous emission of metal cations from the interface metal/oxide and oxygen ions from the interface oxide/electrolyte. These ions represent mobile space charges which migrate through the oxide film to the opposite interfaces. This process requires times from μs to 104 s, depending on the field strength and the film thickness and was monitored in the time domain (current transients of potential steps, 10−6 s to 104 s). The movement of the ionic space charges can be used to determine the concentration of mobile ions, the film thickness, the thickness distribution of nonhomogeneous films and the temperature of extreme thin films.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Ionics 5 (1999), S. 23-30 
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The high field model had to be modified for the anodic growth of amorphous oxide films (Al, Nb, and Ta). Mobile ions are only formed at the interfaces and migrate through the film. Simulations based on this assumption show a very similar shape of current-potential curves compared to the experimental results. The simulations use only one free parameter, the charge density p. All other parameters, such as i0 and β, were taken from the experiments. The formation of amorphous oxides is independent of the crystallographic orientation of the metal substrate. For the crystalline oxide films on Zr the oxide kinetics differ from grain to grain. This requires localized measurements on single grains. Such experiments were carried out with a new device, the droplet cell. Examples of the potentiodynamic and the capacity measurements are presented.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 32 (1981), S. 13-18 
    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: Inhibitoren der passiven Korrosion - Anwendung einer neuen Untersuchungsmethode mit dünnen OxidschichtenEine neue Methode, Inhibitoren der passiven Korrosion zu untersuchen, wird vorgestellt. Potentiodynamische Stromspannungs- und Kapazitätskurven wurden im System Au/Fe2+ in Gegenwart von Inhibitoren aufgenommen. Veränderungen bei der Bildung und Reduktion des γ-FeOOH, des Goldoxids and bei der Sauerstoffentwicklung ermöglichen Aussagen über die Intensität und den Mechanismus der Inhibition.Vorzugsweise warden organische Stickstoffverbindungen untersucht. Pentylamin war ohne Einfluß auf oxidbedeckte Elektroden, während Benzimidazol und seine Derivate starke Inhibitionswirkung zeigten. Die Kapazitätsdaten lassen sich als Reihenschaltung der Kapazitäten von Oxid und Inhibitorschicht deuten. Die Inhibitionswirkung beruht wahrscheinlich auf einer Adsorption des Inhibitors an der Oxidoberfläche. Diese Adsorptionsschicht behindert den Durchtritt hydratisierter Ionen, ist aber ohne Einfluß auf Reaktionen adsorbierter Wassermoleküle, wie z. B. die Sauerstoffentwicklung.Die Anwendbarkeit der Untersuchungsmethode auf andere Systeme wird diskutiert.
    Notes: A new method to test the inhibitors of passive corrosion is presented. Potentiodynamic i(ε)- and C(ε)-curves are recorded in the system Au/Fe2+, inhibitor. The investigations of formation and reduction of the FeOOH-layer, of gold oxide and the oxygen evolution allow estimations of the inhibition efficiency and mechanism.Some organic nitrogencompounds are tested. Pentylamine is ineffective for oxide surfaces, but benzimidazole and its derivates show inhibition effects. The capacity data can be evaluated using a condensor model of a connection in series of the oxide and the inhibitor layer. The detailed discussion shows that adsorption at the film surface is most probable. Such layers inhibite the transfer of hydrated ions, but reactions of water molecules are not influenced, e.g. oxygen evolution.The applicability of this method to other systems is discussed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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