The change of the impedance components during passivation of titanium in H3PO4 solutions was investigated at frequencies ranging from 200 to 15,000 Hertz (Hz). Variation in the values of the resistance and capacitance components of the impedance for the system of passive Ti/electrolyte solution were recorded by using Wien's bridge and assuming a series combination between resistance and capacitance. Analyses of the results obtained from the dependence of Cs and Rs on frequency reveal deviation from (1) Young’s theory and from (2) the modification presented by Bardina and Lukovtsev. This is explained by the assumption that the layer on Ti does not represent an ideal dielectric, but is electrically unhomogeneous.

Subject
Oxides, Slopes, Oxide formation, Oxide films, Titanium oxide, Capacitance, Constants, Film formation, Electrodes, Corrosion potential, Conductivity, Electrolytes, Electrode potential
National Association of Corrosion Engineers
1986
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