Corrosion Behavior of Sprayed Zinc-aluminum (ZAZA) Coatings in Marine Environment

The zinc-aluminum coatings were prepared by means of thermal spray,some samples were sealed with chlorinated rubber paint,and the corrosion behavior and mechanism were studied by eposure tests in sea,salt spray testing and electrochemical impedance spectroscopy (EIS).Scanning electron microscopy (SEM) was employed to assess the micromophology of the coatings.The results showed that the structure of the zinc-aluminum coatings was porous and with some defects,which would lower the protection effect.The organic coating could improve the protection effect and prolong the protection life through sealing the defects of the metal coating.