用原子力显微镜研究铜合金微生物的腐蚀行为

AFM STUDY OF MICROBIOLOGICALLY INFLUENCED CORROSION OF COPPER ALLOYS

用原子力显微镜(AFM)研究了HSn70-1A、HSn70-1B和HSn70-1AB等3种铜合金在硫酸盐还原菌(SRB)菌液中的微生物腐蚀行为。结果表明,3种铜合金表面形成的生物膜形貌各不相同。HSn70-1AB合金表面生物膜的粗糙度大于其余两种合金,表明其生物膜最不均匀。去除生物膜后,3种样品的腐蚀形貌也不相同,粗糙度均有所增加,这是微生物腐蚀作用的结果。研究证实,AFM的定量分析能力是研究材料微生物腐蚀的重要手段。

Atomic force microscopy （AFM） was applied to investigate the microbiologically influenced corrosion of copper alloys immerged in the sulfate reducing bacteria （SRB） inoculated culture medium. Three types of copper alloys were studied, which are HSn70-1A, HSn70-1B and HSnT0-1AB. Biofilms formed on the surface of these copper alloys were different. The measurements of surface roughness indicated an asymmetrical structure of the biofilm, and HSnT0-1AB has maximal surface roughness. Furthermore, the roughness of HSnT0-1A is higher than HSn70-1B. Following the removal of biofilms,increase of roughness indicated the deterioration of copper alloys results from microbiologically influenced corrosion （MIC）. The capability of the AFM to produce quantitative information in the study of MIC was confirmed.