Detection and quantification of defect evolution at buried metal-oxide-polymer interface on rough substrate by local electrochemical impedance mapping

Abstract The role of local nanometric thinning in trivalent chromium conversion coating for the electrochemical stability of buried metal-oxide-model epoxy interface formed on a rough (arithmetic average roughness parameter Ra = 5 µm) electrodeposited substrate is presented. For different morphologies and sizes of thinned zones, the buried interface stability was tested in AC-DC-AC procedure. Local oxide thinning at zones of