Impedance modulus sample coated with

Figure 12.20 Impedance modulus of bare aluminum sample, and aluminum sample coated with dip-coated and electrodeposited PhTMS films (recorded at -0.74V versus Hg/Hg2S04 with the same exposure area). (Adapted with permission from Ref. [73].)...

Figure 14.12 reports the electrochemical impedance modulus at 0.01 Hz versus immersion time for Zr02 pre-treatments doped with 2-mercaptobenzothiazole. Chromate conversion coating and bare substrate are also reported in the figure. The impedance modulus measured at 0.01 Hz immediately after immersion in the electrolyte (0 h) is approximately 10 ohm cm for the sample coated with Zr02 containing 2-mercaptobenzothiazole (indicated by number 2 in the figure). This sample is structured with two layers of Zr02 oxide and the inhibitor was deposited directly on the pre-treated surface. The inner oxide layer was obtained with 0.1 M precursor concentration and the outer with 0.6 M, as described in the legend of Fig. 14.7B. The impedance modulus of this sample exhibits a rather rapid decrease over 48 h in the electrolyte. However, the modulus of the sample with Zr02 pre-treatment doped with...

Electrochemical impedance modulus at 0.01 Hz as a function of immersion time in 0.05 M NaCI solution for AA2024 samples pre-treated with ZrOj layers deposited with the sol-gel technique, chromate conversion-coated AA2024 and bare AA2024... 

Figure 7-3 (author s unpublished experimental data) demoiKtrates the results of the impedance analysis for a medium composed of insulating-base silicon oil with characteristic resistance 10 ohm and capacitance 5 10" F with added 25% urea-coated barium titanyl oxalate conductive particles with characteristic resistance 10 ohm and capacitance 10" F at 25 °C. The pure base oil shows a single relaxation, and particle-containing samples show relaxations at high frequency due to the conductive particles and at low frequency due to the base fluid in the complex modulus plot. 

---