Biofilm Induced Electrochemical Corrosion Mechanism of Q235B and 317L Steels in Reclaimed Water

摘要：

　　The biofilm (containing the mixed iron oxidizing bacteria (IOB) and sulfate reducing bacteria (SRB) induced electrochemical corrosion mechanism on the corrosion 317L stainless steel were investigated using the weight-loss method, count methods, surface analysis and electrochemical techniques.The biofilm morphology and the elemental composition was determined by the scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS).Results showed the passive biofilm with chromium and nickel formed immediately as the 317L coupons immersed in sterile water at 1 days and the radius of the impedance spectrum being largest;Then, as the erosion of Cl-and SO42-, the radius of the impedance spectrum reduced and open circuit potential shift negative, the passivation effect gradually weakened.While in reclaimed water, the mixed biofilm inhibited the corrosion process in the first 10 days through reducing the mental reaction area and suppressing the transfer of the oxygen.Afterwards, anaerobic SRB became the predominant bacteria, promoting corrosion via destroying the passivation film formed before.

关键词： biofilm induced electrochemical corrosion IOB and SRB 317L stainless steel reclaimed water

作者: ZHANG Haiya CHEN Chao TIAN Yimei WAN Jianmei

作者单位: School of Environmental Science and Engineering, Tianjin University, Tianjin, 300350, China;School o School of Environment, Tsinghua University, Beijing, 100084, China School of Environmental Science and Engineering, Tianjin University, Tianjin, 300350, China

会议类型: 国际会议

会议名称: The 2017 International Symposium on Environmental Science and Technology (2017环境科学与技术国际会议)

会议地点: 北京

会议语种:英文

页码: 129-141

在线出版日期: 2017-09-19（万方平台首次上网日期，不代表论文的发表时间）