Pitting corrosion Einstein-Smoluchowski relation

The kinetics of repassivation of small pits in an early stage of their development seem to be related to the transport of aggressive anions, such as the chloride acciunulated locally during the intense dissolution process from the pit to the bulk [4,30]. If this transport is the rate-determining step, one expects the repassivation time to increase with the depth of a corrosion pit. If we simply apply the Einstein-Smoluchowski relation for the transport time out of a pit of radius r [Eq. (30)] and if the radius r is given by the local current density / and the lifetime of the pit by Eq. (31), we obtain for the repassivation time [Eq. (32)]... 

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See also in sourсe #XX -- [ ]

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