Influence of Static Magnetic Field on Formation of SRB Biofilm

The electrochemical behavior of sulfate-reducing bacteria(SRB) biofilm was investigated by means of micro electrode of platinum in the absence and presence of a static magnetic field(SMF) respectively. The results showed that a 141.4 μm thick biofilm with high resistance(Rf) was form on the surface of Pt metal in the absence of SMF, and the process of adsorption and desorption of the biofilm took a long time resulting in corrosion products on the Pt foil surface. In the presence of SMF, it was hard to adsorb on the surface Pt foil for SRB and the biofilm was thinner(the thickness was 67.06 μm). The adsorption and desorption of the later biofilm proceeded rapidly and reached an equilibrium state after short time indicating that little amount of corrosion products was generated in the biofilm, which means that the corrosion rate of the metal beneath the biofilm is lower. The value of charge transfer resistance(Rct) suggested that the applied SMF might greatly suppress the movement of surface charge, thus affect electrochemical process.