Hi,

I am interested in formulas for water absorption by diffusion and permeation in coatings and paints. I want to simulate paintings with good (polyurethane paint with primer on stainless steel substrate) and bad adhesion on the substrate (epoxy paint on aluminum). Can you assist me with this?

Can you also explain the use of Electrical Impedance Spectroscopy (EIS) with this regard? Do I use this method or can I use a gravimetric method to determine diffusion and chemical degradation?

Rgrds, Mario