Abstract
It is verified by impedance measurements on iron electrodes pretreated in various manner that the frequency dispersion occurring during the initial phase of immersion in acid solutions, represented by the depression angle Φ , is a quantity which depends upon the roughness of the electrode surface only. It is shown that Φ is more appropriate for assessing the initial state of a metal for the purpose of subsequent corrosion studies than the polarization resistance R p or the apparent double layer capacity C′ dl or that corrected for its dispersion elements C dl .
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