The marine micro fouling biofilm would affect the metal corrosion process and the antifouling coating performance, as the primary food chain of the fouling biome, and it is a research focus at home and abroad. This paper studies the corrosion product film formed on the surface of the carbon steel exposed for more than 100 days in the sea water of Qingdao Zhonggang Habour in winter, and the biofilm formed on the surface of the slide, HT anticorrosive coating and the NFGP600 antifouling coating, by means of the electrochemical technique, with the microbial membrane characterized by SEM, EDS, and XRD. The types and the morphology of bacteria, diatoms and protozoa in the biofilm are analyzed. It is shown that the biofilms are composed of bacteria, diatoms, protozoa, inorganic and organic particles in the seawater. At the steel/seawater interface, the steel corrosion and microbiological adhesion processes occur simultaneously. These two processes are interacted to form an unshaped, soft and discontinuous biofilm on the surface of the carbon steel. The biofilm on the surface of the anticorrosive coating is relatively not very compact due to the protozoa's encroachment on the fungal algae and the formation of the carbonate in the film. The biofilm formed on the surface of the antifouling coating is relatively compact.

marine fouling organisms  /  biofilm  /  antifouling coating  /  anticorrosive coating