... SchweitzerCorrosion Control Through Organic Coatings, Amy Forsgren7278_series 2/8/06 3:24 PM Page 2© 2006 by Taylor & Francis Group, LLC 24 Corrosion Control Through Organic Coatings ... protectionto steel through multiple mechanisms:• Phosphate Ion DonationPhosphate ion donation can be used for ferrous metals only [23,37,39,45, 52].As water penetrates through the coating, ... passage of anions through the filmwas very restricted. If the electrolyte’s concentration was above the polymer’s fixed-anion concentration, anions could permeate much more freely through the film...