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  • 1
    Electronic Resource
    Electronic Resource
    Impedance measurements on lacquered tinplate: fitting with equivalent circuits (1999)
    Springer
    Journal of applied electrochemistry 29 (1999), S. 383-392 
    Details
    ISSN: 1572-8838
    Keywords: coatings ; equivalent circuits ; impedance ; quality control ; tinplate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Experimental impedance data previously obtained for various kinds of lacquered tinplate are fitted using two different equivalent electrical circuits, with the aim of assessing the advantages/disadvantages of this procedure for quality control of the material as compared to direct evaluation of the impedance diagrams. It is shown that for screening purposes the same conclusions can be obtained either by fitting or by qualitative analysis of the diagrams. The physical meaning of parameters obtained from the impedance measurements is also discussed. The results are interpreted on the basis that the lacquer is characterized by intact and porous areas which are associated with a capacitance in parallel with the pore resistance in the high frequency range. At lower frequencies other processes occur in series with the resistance of the pores. For short immersion times, the passivation film present on tinplate is detected, whereas for longer immersion times, faradaic processes are detected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003470415180
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Measurements of electrochemical impedance on the alloy Al 2024T3: an analysis of parameters used to predict the quality of the anodic film (1987)
    Springer
    Journal of applied electrochemistry 17 (1987), S. 641-647 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Using the electrochemical impedance technique, the deterioration process of the alloy Al 2024T3 was followed in the presence of NaCl and Na2SO4. It was verified that the resistance obtained as the extrapolation to the null frequency in the impedance diagram, even though significant, is not sufficient to characterize the protecting quality of the anodic film. This parameter is only considered as a measure of anticorrosive protection when it is preceded by a capacitive loop at high frequencies. This phenomenon in the high frequency range gives a measure of the sealing quality of the film.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01084140
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Anodic dissolution of nickel in concentrated sulfuric acidic solutions (1996)
    Springer
    Journal of applied electrochemistry 26 (1996), S. 1083-1092 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The anodic dissolution of nickel in concentrated sulfuric acidic solutions is characterized by two diffusion plateaux related to the active and transpassive regions. For the same speed of rotation of a rotating disc electrode, the two plateaux currents are almost identical. However, the less anodic one gives rise to a rough electrode surface while a polished surface is observed at the more anodic one. For nickel as-received, mass transport influences the current over the whole potential range. After heat treatment, only the current for the two plateaux were mass transport controlled. Electrochemical impedance diagrams show that the lowest frequency capacitive loop is influenced by mass transport. Electrohydrodynamic (EHD) impedance diagrams show two different regions. In the low frequency range, the results follow the theoretical curve corresponding to a uniformly accessible electrode with a very high Schmidt number around 107. At high frequency, the EHD impedance may correspond to an interface covered by a gel layer formed from the products of the anodic dissolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00243732
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    Paper (German National Licenses)
    Fulltext
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