6533b822fe1ef96bd127ce88
RESEARCH PRODUCT
Impedance characterization of the electrochemical environment under a polymer film artificially delaminated
Anne RubinKevin OgleRoland OltraB. Vuilleminsubject
Materials science020209 energyGeneral Chemical EngineeringDelamination[ SPI.MAT ] Engineering Sciences [physics]/MaterialsOrganic coatingsImpedance02 engineering and technologyElectrolyte[SPI.MAT] Engineering Sciences [physics]/Materials021001 nanoscience & nanotechnologyDielectric spectroscopyCorrosion[SPI.MAT]Engineering Sciences [physics]/MaterialsMicroelectrodeElectrical resistivity and conductivitySteelDelaminationElectrode0202 electrical engineering electronic engineering information engineeringElectrochemistryComposite material0210 nano-technologyElectrical impedanceMicroelectrodesdescription
International audience; Knowledge of the electrical conductivity of the zone under a delaminated paint film is one necessary input parameter for the simulation of electrochemically driven underpaint corrosion. In this work, a microelectrode array system has been developed, tested, and applied to measure the spatial distribution of resistivity in the delaminated zone along the metal/polymer interface. The experimental device consists of a linear array of six 100 m diameter stainless steel microelectrodes (100 m in diameter) embedded in a steel substrate. A polymer coatingwas applied and an artificial "delaminated zone"was created using the laser-induced decohesion technique. The electrochemical impedancewas measured between the first uncovered electrode and the electrodes at progressively increasing distances in the artificial delaminated zone. A steady decrease in the impedance with time can be observed, probably due to the continued ingress of electrolyte and a variation of the gap width.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2008-04-16 |