Coating impedance

Application of surface active agents has demonstrated that kerogen forms a protective coating around the mineral matrix. This coating impedes the contacting of mineral with leachable liquid (1) and may be the primary cause of the impermeability and stress properties of the oil shale (2). 

In a first approximation, the equivalent circuit presented in Figure 13.15 can be used to represent the electrode in which the interfacial impedance between the oxide and the electrolyte was eissumed to be negligible as compared to the coating impedance. The impedance of the oxide layer can be considered to correspond to a... 

In the next step, the measurement on the sample of an anticorrosion coating were performed using the presented impedance analyzer and the Gamry Reference 600. The experimental setup was presented in Fig. 8. As the coating impedance is very high, the Faraday cage use was essential. 

PPy AI.O3 A1 alloy 2024T3 Painting EiS in DHS The coating impedance increases when the Alumina nanoparticles content increases. [51]... 

The use of electrochemical impedance spectroscopy (EIS) for the assessment of coatings has been under development for many years now [83]. The first period application of the technique was restricted to the study of the corrosion occurring with poorly protective coatings and coating impedances were evaluated by shape of the Nyquist plots. However, relatively few reports have been published describing results obtained from protective organic coating systems as used commercially [84]. 

Electronic Interactions Chemical Interactions Redox Reactions at the Conducting Polymer Surface Conducting Polymer as an Oxidant Neutral (Undoped) Forms of Conjugated Polymers Role of the Dopant Ion Influence of CPs on Overall Coating Impedance Approaches to Forming Conjugated... 

To achieve a 40-dB overall box shielding, a deposited conductive coating would have to provide at least 50 dB. The coating impedance Zj, in ohms/square is determined from Eq. (11.7)... 

To further prove the similarity between panels A and B, the blister on panel B was perforated deliberately with a needle. Directly after this the impedance spectrum of Figure 20a and b was measured, which is rather similar to the data measured on panel A. Because it is known that defect and delamination are in this case combined, an equivalent circuit with a corrosion component in parallel to the coating impedance must be used if further analysis is to be performed. 

Pfeifer KB, Hughes RC, Jenkins MW, Schneider TW (1999) Viologtai polymer-coated impedance sensors for midrange humidity levels and other volatile organic compounds. J Electrochem Soc 146 794—799... 

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