青岛港湾微型污损生物群落研究——不同涂层的碳钢/海水界面生物膜初探

The microfouling biofilms in Qingdao harbors——A preliminary study of the carbon steel/seawater interface biofilms of different coatings

海洋微型污损生物膜会影响金属腐蚀过程和防污涂料性能,是污损生物群落的初级食物链,一直是国内外的研究焦点。研究了冬季青岛中港海水中暴露100余天的碳钢表面形成的腐蚀产物膜,以及载玻片、HT防腐涂层和NFGP600防污涂层表面形成的生物膜,采用电化学技术研究材料表面生物膜特征,运用SEM、EDS、XRD表征生物膜形态和物质组成,分析生物膜细菌、硅藻和原生动物的种类及形貌。研究表明,生物膜由细菌、硅藻、原生动物和海水中无机、有机颗粒组成;钢/海水界面同时发生钢的腐蚀和微型生物附着过程,两个过程互相作用使碳钢表面形成不定型、松软、不连续的腐蚀产物膜;防腐涂层表面生物膜由于原生动物对菌藻的蚕食和碳酸盐的存在,形成了较为疏松的生物膜,而防污涂层表面没有原生动物的影响,形成了致密的生物膜,在一定程度上能够隔绝海水环境。

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.