Received date: 2012-05-28
Revised date: 2012-09-29
Online published: 2012-12-11
Supported by
Supported by National Natural Science Foundation of China (No.41006054) and the Knowledge Innovation Program of the Chinese Academy of Sciences (No.KZCX2–EW–205)
Shewanella is a typical iron–reducing bacteria which can reduce insoluble ferric iron to soluble ferrous iron and consume oxygen, being considered as the reasons of corrosion inhibition. The main study on Shewanella algae (SA) is the degradation of environmentally harmful organic compounds and heavy metals, and there are very few reports on the interaction of metal corrosion and SA. In this paper, the bacteria isolated from yellow rust layer were identified as SA by using molecular biology techniques. The growth curve of SA was determined with spectrophotography. The results showed that the growth curve was divided into three phases: exponential growth phase, steady phase and decay phase. The effects of SA on corrosion of Zn–Al–Cd anode were investigated by using electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) and fluorescence microscopy (FM).The results showed that corrosion potential for samples exposed to the culture medium containing SA was higher than that for samples exposed to the sterile culture medium during the whole experiment. Rct value in the culture medium containing SA was much greater than that of anode in the sterile culture medium. The bacteria could inhibit the corrosion of the specimen. The reason was that a biofilm layer was formed on the sample surface and the oxygen was consumed through the metabolic activities of bacteria in the culture medium containing bacteria. The biofilm layer was formed on the 5th day in the culture medium containing bacteria. While in bacteria–free system, obvious corrosion pits and white corrosion products were seen on the sample surface. The complete biofilm was formed on 7th day, and it detached from the sample on 11th day because of the exhaustion of nutrients and oxygen, showing that the biofilm formation had a great relationship with the presence of nutrients and oxygen.
ZHANG Jie SONG Xiuxia LUAN Xin SUN Caixia DUAN Jizhou HOU Baorong . EFFECTS OF SHEWANELLA ALGAE ON CORROSION OF Zn–Al–Cd ANODE[J]. Acta Metall Sin, 2012 , 48(12) : 1495 -1502 . DOI: 10.3724/SP.J.1037.2012.00309
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