应用原子力显微镜（AFM）研究硫酸盐还原菌（SRB）、微生物膜、腐蚀产物膜和A3钢腐蚀后的表面形貌，获得了高分辨率、清晰的图像.测得了SRB的大小，微生物膜、腐蚀产物膜的厚度和形成的点蚀孔深度.结果表明，A3钢的微生物腐蚀过程是先形成致密的硫化物膜，然后微生物在其上面聚集附着形成微生物膜；A3钢的微生物腐蚀主要以点蚀形式发生.
The morphology of sulfate- reducing bacteria (SRB),microbial biofilms，corrosion product film and corroded A3 steel have been observed by atomic force microscopy (AFM).The results of high-resolution topographical images gave the information of the size of the cell， the thickness of biofilms and corrosion product film and the pitting corrosion depth. It can be concluded that compact sulphide films were formed on the surface of A3 steel and then microbiologically attached and formed biofilms during the process of microbiologically influenced corrosion.The corrosion of A3 steel mainly presents pitting corrosion character.
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