Influence of Calcareous Deposit on Corrosion Behavior of Q235 Carbon Steel with Sulfate-Reducing Bacteria

ZHANG Jie; LI Xiaolong; WANG Jiangwei; XU Weichen; DUAN Jizhou; CHEN Shougang; HOU Baorong

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Influence of Calcareous Deposit on Corrosion Behavior of Q235 Carbon Steel with Sulfate-Reducing Bacteria

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Cathodic protection is a very effective method to protect metals, which can form calcareous deposits on metal surface. Research on the interrelationship between fouling organism and calcareous deposits is very important but very limited, especially sulfate-reducing bacteria(SRB). SRB is a kind of very important fouling organism that causes microbial corrosion of metals. A study of the influence of calcareous deposit on corrosion behavior of Q235 carbon steel in SRB-containing culture medium was carried out using electrochemical impedance spectroscopy(EIS), scanning electron microscopy(SEM) and surface spectroscopy(EDS). The calcareous deposit was formed with good crystallinity and smooth surface under the gradient current density of -30 μA cm^(-2) in natural seawater for 72 h. Our results can help elucidate the formation of calcareous deposits and reveal the interrelationship between SRB and calcareous deposits under cathodic protection. The results indicate that the corrosion tendency of carbon steel was obviously affected by Sulfate-reducing Bacteria(SRB) metabolic activity and the calcareous deposit formed on the surface of carbon steel under cathodic protection was favourable to reduce the corrosion rate. Calcareous deposits can promote bacterial adhesion before biofilm formation. The results revealed the interaction between biofouling and calcareous deposits, and the anti-corrosion ability was enhanced by a kind of inorganic and organic composite membranes formed by biofilm and calcareous deposits.

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《中国海洋大学学报：英文版》 |2017年第6期|1213-1219|共7页
作者
ZHANG Jie; LI Xiaolong; WANG Jiangwei; XU Weichen; DUAN Jizhou; CHEN Shougang; HOU Baorong;
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作者单位

Key Laboratory of Marine Environmental Corrosion and Bio-fouling;

Institute of Oceanology;

Chinese Academy of Sciences;

Qingdao 266071;

P. R. China;

University of Chinese Academy of Sciences;

Beijing 10049;

P. R. China;

Institute of Material Science and Engineering;

Ocean University of China;

Qingdao 266100;

P. R. China;

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原文格式 PDF
正文语种 chi
中图分类海洋学;
关键词
microbiological; corrosion; sulfate-reducing; bacteria; calcareous; deposit; cathodic; protection;

Influence of Calcareous Deposit on Corrosion Behavior of Q235 Carbon Steel with Sulfate-Reducing Bacteria

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