Effect of Mixed Bacteria on Corrosion Properties of Zn-Al-Cd Sacrificial Anode

摘要

In this paper, the mixed microorganism (sulfate reducing bacteria and Shewanella algae) on corrosionbehavior of Zn-Al-Cd sacrificial anode has been studied using electrochemical impedance spectroscopy(EIS), scanning electron microscopy (SEM) and fluorescence microscopy. The EIS results showed thatthe corrosion rate of mixed bacteria samples has experienced a process of increasing first and thendecreasing as the test time is extended. SEM and fluorescence microscopy results showed that bacteriahave undergone a process from mass propagation to the formation of a layer of biofilm on the surface ofthe sample. This layer of biofilm formed by bacteria, corrosion products and bacterial metabolitesprotects the sample, avoiding contact of corrosive media with the sample, thereby reducing the corrosionrate of the sample.