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- W1993839688 abstract "Impedance spectroscopy is a comprehensive technique that operates with frequency response (FR) to provide useful information about both surface treatments and layers produced. In this paper, two FR types were obtained for the aluminium samples during treatment by plasma electrolytic oxidation (PEO). The first was obtained in-situ during PEO, using a frequency sweep of bipolar voltage pulses between 20 Hz and 20 kHz. The modulus and phase angle components of the frequency response were analysed as functions of voltage and treatment time. With increased frequency, the impedance modulus and phase angle were found to decrease from 104 to 10 Ω and from 0 to − 80° respectively. The second FR was obtained using electrochemical impedance spectroscopy (EIS) of PEO coatings, at open-circuit potential. The samples were found to exhibit an active-capacitive load behaviour, whereby the impedance decreased from 106 to 102 Ω, and phase angle varied between − 20° and − 80° with the frequency increase. Both FRs show similar behaviour within the frequency range from 5 to 20 kHz. This approach allows estimations of the frequency response of the PEO microdischarges, to justify the optimal frequency for the pulsed bipolar PEO and also suggests concepts for feedback process control." @default.
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- W1993839688 date "2007-12-01" @default.
- W1993839688 modified "2023-10-16" @default.
- W1993839688 title "Impedance spectroscopy characterisation of PEO process and coatings on aluminium" @default.
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- W1993839688 doi "https://doi.org/10.1016/j.tsf.2007.06.169" @default.
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