阴极极化对金属电极表面微生物膜的影响

阴极极化对不锈钢表面微生物膜的附着有一定的影响,通过 荧光显微镜记数和细菌双染色方法(AO+PI),对在不同电位下极 化过的不锈钢表面进行了观察,同时做了对比实验。实验证明在一 定的范围内(-800mV~-1000mV),阴极极化对微生物向洁净金属 表面的附着有一定的抑制作用,但是对已经附着的微生物膜不能 够起到脱除或完全杀灭作用,只能杀死靠近金属表面的微生物。通 过模拟膜实验,从侧面证明了只有微生物膜附着而无生物活性时, 钝性金属的开路电位不会发生正移。

Effect of Cathodic Polarization on Microbial Film in seawater Environment

Cathodic polarization has a great effect on the attachment of microbial film to metal surface. One kind of stainless steels was selected to study the change of OCP of electrodes with and without microbial film after polarization at different potentials and time. The bacteria number of some electrodes surfaces was measured using fluorescence microscope with double-staining method (AO+PI). It was proved that at certain range of potensile (-800--1000mV), cathodic polarization can restrain the attachment of microbe to clean metal surface at certain degree and kill some microbe near metal surface, but it can't remove the microbial film that have already formed. It was also demonstrated by simulated film test that the attachment of microbial film without liveness can't cause the moving of OCP of passive metal to positive direction.