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

作     者：ZHANG Jie LI Xiaolong WANG Jiangwei XU Weichen DUAN Jizhou CHEN Shougang HOU Baorong 

作者机构：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 

出 版 物：《Journal of Ocean University of China》 (中国海洋大学学报（英文版）)

年 卷 期：2017年第16卷第6期

页      面：1213-1219页

核心收录：

学科分类：0710[理学-生物学] 080503[工学-材料加工工程] 0908[农学-水产] 0707[理学-海洋科学] 08[工学] 0815[工学-水利工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0824[工学-船舶与海洋工程] 

基　　金：supported by the National Natural Science Foundation of China (Nos.41376003 and 41006054) the Strategic Priority Research Program of the Chinese Academy of Sciences (No.XDA13040405) 

主　　题：microbiological corrosion sulfate-reducing bacteria calcareous deposit cathodic protection 

摘      要：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.