THE APPLICATION OF ENA FOR COMPARISON OF PROTECTIVE PERFORMANCE OF ZRP MODIFIED BY COMBINATION OF Zn DUST WITH ALUMINIUM OR CARBON TYPE FILLERS

Abstract

The possible effects on the protective performance of ZRP modified by combination of Zn dust with aluminium or carbon type fillers were investigated using electrochemical noise analysis (ENA). The role of different oxygen diffusion characteristics (identified on tested coating systems with ENA) on delamination tendency was tested during 168 hrs immersion tests in 0.05 M NaCl. It was shown the protective performance of tested type of coating systems can be changing with immersion time rather differently in relation to different ability of polymer matrix with the Zn/Al or Zn/C particles combination for oxygen transport to the coating/steel interface.