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A Novel Method for the Study of the Effects of Cl− Ions on Passivation Using the Cl36 Radioisotope: Application to the Passivation of Nickel
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1990
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Situ InvestigationEngineeringElectrode-electrolyte InterfaceChemistryChemical EngineeringCorrosionRadiotracer MethodCl− IonsRadiation ChemistryElectrochemical InterfaceMaterials ScienceInorganic ChemistrySurface ElectrochemistrySurface ConcentrationElectrochemistryNovel MethodSurface ScienceCl36 RadioisotopeRadioanalytical ChemistryElectrochemical Surface Science
A novel method has been developed for the in situ investigation of the interactions of Cl− with metal surfaces. The amount of chlorides at the surface is measured by a radiotracer method, using Cl36 radioisotope. The principle of the method is to detect, at the back of the electrode, the electrons which are emitted by adsorbed Cl− or Cl− incorporated in a surface film. The experimental setup allows simultaneous radiochemical and electrochemical measurements to be performed on polycrystal or single‐crystal materials. Surface concentrations of chlorides in the range of the submonolayer up to chloride films can be quantitatively measured. The power of this novel method is illustrated by a study of the surface concentration of Cl− on nickel in the active and passive regions in .