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An experimental setup allowing pH measurements inside a confined volume representing a lapped joint was designed in our last study [1]. The pH evolution over steel surface in confined conditions was monitored. In this study, the experimental pH was compared with that calculated using a two-dimensional transport-reaction model only in the case of a confined iron surface. The difference between the experimental and calculated pH in the steady state was attributed to the limitation of the modelling approach, more especially concerning solid phases precipitation inside the cavity. Nevertheless, only short term (hour) experiments and simulations can be compared illustrating the necessary improvement of these basic models to predict real perforation corrosion rate at long term.

NUMERICAL SIMULATION OF ELECTROCHEMICAL CHANGES IN THE STUDY OF CORROSION IN AN OCCLUDED ZONE