Abstract: The water absorption, adhesion capability, flaking, the resistance to cathodic disbondment and other anticorrosive properties of epoxy coating were studied by static immersion in natural seawater and three electrolytic seawaters separately. The results suggested that the epoxy coating in all tested seawaters showed good anticorrosive performance, no blistering or flaking off, and the adhesion remaining higher than 3.5 MPa. When the concentration of residual was less than 10 mg/L, the electrolytic seawater had no significant influence on flaking and cathodic disbondment of the epoxy coating, and the penetration of sea water alongside the metal-coating interface led to coating detachment from the substrate. When the residual chlorine concentration reached 15 mg/L, the coating deteriorated rapidly from the aspect of flaking and cathodic protection. High concentration of chlorine could accelerate the failure of the coating.