doi:

DOI: 10.3724/SP.J.1037.2010.

Acta Metallurgica Sinica (金属学报) 2010/46:10 PP.1250-1257

EFFECTS OF SRB ON CORROSION OF Zn--Al--Cd ANODE IN MARINE SEDIMENT


Abstract:
With the development of marine industry, the corrosion of metal structures in marine sediment has received increasing attention. Marine sediment is a very complex marine corrosion environment. The corrosion of sulfate--reducing bacteria (SRB) in the marine sediment is thought as one of major corrosion factors. Sacrificial anodes are widely used for protection of steel structures in the marine environment due to their high theoretical current efficiency, low active potential and low cost. However, in the marine environment, the sacrificial anodes may be attacked by microbial activity, which leads to serious failure and energy loss. Some researchers have investigated the biocidal activity of sacrificial anode, but work about the influence of microbes on the performance of sacrificial anode has been rarely reported. In this paper, a comparative study of the corrosion behavior of Zn--Al--Cd sacrificial anode in marine sediment without and with SRB was carried out using electrochemical impedance spectroscopy (EIS), polarization curve (PC), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results of EIS and PC showed that the corrosion of the sample was enhanced sharply in the presence of SRB at the beginning, while the corrosion performance of the sample in marine sediment with and without SRB gradually became similar with each other due to the decreasing SRB populations. SEM images revealed that the damage of the sample in the SRB--containing medium was severer than that in the sterile medium. EDS analysis showed that the concentration of Al and Zn in the surface film of the sample with SRB was much lower than that for the sample without SRB, which suggests that the corrosion rate of the sacrificial anode is accelerated by SRB.

Key words:sulfate reducing bacteria, Zn--Al--Cd, marine sediment, electrochemical impedance spectroscopy

ReleaseDate:2014-07-21 15:31:52

Funds:Supported by National Key Technology R&D Program (No. 2007BAB27B01) and National Natural Science Foundation of China (No. 41006054)



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