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The semiconductive properties of the passive film formed on iron were investigated by measuring the impedance of passivated iron electrodes in neutral borate and phosphate solutions. Mott-Schottky type of plot was applied to the impedance data to obtain the donor density ND and the flatband potential VFB as a function of film formation potential, oxidationtime, and ion species present in the solution. The value of ND obtained for the passive film is in the range of 1×10^26-2×10^27m^-3 and decreases with increasing formation potential and oxidation time, indicating that the structural and electronicdefects in the passive film decrease with increasing film thickness. The value of ND of the passive film formed in phosphate solution is greater than that in borate solution. From the fact that when the electrolyte was changed from borate to phosphatesolution ND increased from the value in borate solution to the value in phosphate solution in a time period of about 10^3s, it is evident that phosphate ions penetrate into the passive film producing a large number of defects

Mott‐Schottky Plot of the Passive Film Formed on Iron in Neutral Borate and Phosphate Solutions