MATHEMATICAL MODELS FOR THE ANODISATION CONDITIONS AND STRUCTURAL FEATURES OF POROUS ANODIC Al2O3 FILMS ON ALUMINIUM

A kinetic model for the growth of porous anodic Al2O3 films was applied to experimental results obtained at different bath temperatures and current densities of Al anodisation. Treatment of the values of parameters involved in the kinetic equation showed that the pore/cell surface density depends only on current density, the pore base diameter depends only on bath temperature, and the equations ln n = p ln J + p" and ln Db = g ln T + g" accurately apply. By using these equations, mathematical models for other structural features were also formulated describing their dependence on the anodisation conditions. 23 refs.