ENA study of different properties of interface between fillers and binder on the delamination kinetics of Zn and MIO pigmented epoxy coatings

摘要

Delamination kinetics of four ZRP with the same OPVC (65 vol. %) and different commercial quality of MIO as barrier pigment has been investigated by means of electrochemical noise (EN) measurements during immersion tests (168 hrs in 0.05 M NaCl). The results indicated that for some type of filler and epoxy binder combination it can be supposed the chemically bonded fillers/binder interface retards the diffusion of water with O_2 and Cl~- to the coating/steel interface. This improvement restrains the development of electrochemical reactions at the coatings/steel interface with impact on slowing down delamination rates for this type of coatings.