Evaluation for Corrosion Resistance of Nano-Cluster Layer and Biofilm Formation

Biofilm is an inhomogeneous film-like matter which attached bacteria produce on materials surfaces. Recently, the knowledge and information about the interaction between biofilm and metallic materials have been revealed gradually and it has been clarified that biofilm would be involved in many interfacial phenomena on metallic materials, such as corrosion, taint in various ways, antibacterial effects etc. The control for biofilm formation on materials surface would be a key factor for various industrial problems from the viewpoint. In this paper, we focused on nano-particles cluster stacked films or single one of chromium and/or nickel produced by helicon sputtering process. The specimens having those films on their surfaces were immersed by a specially devised biofilm formation apparatus. Then the biofilm formation behaviors for the specimens were observed and evaluated by a 3D visualized microscopy, a low pressure SEM-EDX etc. And the possibility of biofilm control for those nano-particles cluster films and the relation between biofilm and corrosion were discussed