Potentiostatic Pulse Testing for Assessment of Early Coating Failure
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Jiho Kang
Abstract
Potentiostatic Pulse Testing (PPT) was investigated as a technique to assess the early stage of organic coating failure. Current transients collected from dummy cells and real coated samples were fitted to an exponential decay function to evaluate the values of equivalent circuit parameters. PPT only provided values for only some of the circuit elements, whereas Electrochemical Impedance Spectroscopy (EIS) revealed most values of the assumed circuit elements. However, it was difficult to know a priori whether to use a one- or two-time-constants model for EIS data obtained from the real coated panels. Fast Fourier Transform (FFT) analysis was used to compare the data generated in the two different domains. The impedance spectra from the Fourier transforms was over only a part of the frequency range accessible by the EIS, but the spectra from the two methods exhibited reasonably good agreement.
© by Oldenbourg Wissenschaftsverlag, München
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- On the Stability of Passivity of Ti-Al Alloys in Acidic Environment
- AES and RBS Characterization of Anodic Oxide Films on Al-Ta Amorphous Alloys
- XPS-Studies on the Formation of Passive Layers on Sn and CuSn Alloys in 0.1 M KOH
- Early Stages of Protective Oxide Layer Growth on Binary Iron Aluminides
- Effect of Pretreatment on the Intermetallics in Aluminum Alloy 2024-T3
- Potentiostatic Pulse Testing for Assessment of Early Coating Failure
- Photoelectrochemically Driven Charge Transport across Free Standing TiO2 Pigmented Organic Polymer Films
- Conducting Polymers for Corrosion Protection: A Critical View
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Articles in the same Issue
- Preface
- On the Stability of Passivity of Ti-Al Alloys in Acidic Environment
- AES and RBS Characterization of Anodic Oxide Films on Al-Ta Amorphous Alloys
- XPS-Studies on the Formation of Passive Layers on Sn and CuSn Alloys in 0.1 M KOH
- Early Stages of Protective Oxide Layer Growth on Binary Iron Aluminides
- Effect of Pretreatment on the Intermetallics in Aluminum Alloy 2024-T3
- Potentiostatic Pulse Testing for Assessment of Early Coating Failure
- Photoelectrochemically Driven Charge Transport across Free Standing TiO2 Pigmented Organic Polymer Films
- Conducting Polymers for Corrosion Protection: A Critical View
- Challenges in the Surface Analytical Characterisation of Anodic TiO2 Films – a Review
