Journal of The Electrochemical Society · 1995 · 74 citations · 0 references
Natural SciencesChemistryMaterials ScienceCorrosion ScienceElectrochemistryPhysical ChemistryCorrosion MechanismsElectrochemical CorrosionElectrochemical Impedance SpectroscopyElectrode MaterialsElectrode-electrolyte InterfacesWorking ElectrodesCorrosion Impedance AnalysisElectrochemical CharacterizationElectrochemical Corrosion MechanismsElectrochemical Impedance AnalysisHot CorrosionPlatinum ElectrodesPolarizationPolarization Potential
An electrochemical impedance study was made for a platinum working electrode in ‐10 mole percent melts in a temperature range of 1150 to 1200 K. The principal electroactive oxidant is a solute of , which has a lower Warburg coefficient than that for the major oxidant , in pure melts in contact with 0.1 and environments. The effects of temperature, basicity, oxygen potential, and polarization potential on the impedance of the system were investigated. The results are used to interpret hot corrosion induced by deposits. In the vanadate‐sulfate melt, the oxidant arrives at the electrode/electrolyte interface by the counterdiffusion of solutes with V4+(‐derived) and V5+ (‐derived). Electron hopping in this solution does not occur.