Percolation model, dealloying

In the percolation model, it is the interconnectedness of atoms of the LN component that allows the dealloying front to proceed into the alloy. However, without allowing for surface diffusion, the dissolution process stops after penetrating a short distance into the crystal as the MN component covers the surface and prevents further dissolution [11],... 

The second model extends the surface diffusion model to include the importance of the atomic placement of atoms in the randomly packed alloy. The model considers that a continuous connected cluster of the less noble atoms must exist to maintain the selective dissolution process for more than just the few monolayers of the alloy. This percolating cluster of atoms provides a continuous active pathway for the corrosion process as well as a pathway for the electrolyte to penetrate the solid. This is expected to depend on a sharp critical composition of the less noble element, below which dealloying does not occur.54, (Corcoran)5... 

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