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The Effect of Chloride Ion and Sulfate-reducing Bacteria on Dissolved Oxygen Reduction Reaction on the Surface of Q235 Steel

Author: LiYongJuan
Tutor: ZhangDun
School: Graduate School , Chinese Academy of Sciences ( Institute of Oceanography )
Course: Marine Chemistry
Keywords: Dissolved oxygen reduction reaction Q235 steel Chloride ion Sulfate-reducing bacteria
CLC: X703
Type: Master's thesis
Year: 2009
Downloads: 79
Quote: 2
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Abstract


In the marine environment , dissolved oxygen cathodic reduction reaction is one of the main factors in the corrosion of iron and steel materials , the seawater chloride ion ( Cl - ) and sulfate-reducing bacteria (SRB) of dissolved oxygen reduction reaction occurs thereby affect steel material the corrosion behavior . Marine engineering material Q235 steel as the research object , by cyclic voltammetry , electrochemical impedance spectroscopy and rotating disk electrode and rotating disk - ring electrode linear sweep voltammetry electrochemical method , Cl ~~ - and sulfate-reducing bacteria on the surface of Q235 steel electrode dissolved oxygen reduction reaction and its impact mechanism . The study showed that : Q235 carbon steel in simulated concrete pore solution electrode surface oxide reduction reaction and dissolved oxygen reduction reaction at the same time ; dissolved oxygen reduction reaction in the cathode reaction within the potential range of initial mixing process control electron reaction more negative potentials four-electron reaction when controlled by the diffusion process . When added to the solution of 0.02 M Ca (OH) 2 Cl ~ - , with Cl ~ - increase of the concentration , the solution resistance decreases , dissolved oxygen reducing reaction peak potential gradually shifted positively , i.e. dissolved oxygen reduction reaction overpotential Save small; reduction reaction rate is gradually reduced with the increase of chloride ion concentration of dissolved oxygen . Since sulfate-reducing bacteria in the biofilm formed by the electrode surface has hindered the dissolved oxygen to reach the electrode surface , so that the dissolved oxygen reduction reaction with sterile suppressed to a certain extent compared to sulfate reduction at the same time , dissolved oxygen reduction reaction rate decreased; the bacteria form biofilms , the dissolved oxygen reduction mechanism has also undergone a change , to restore the four - electron reduction of dissolved oxygen in the absence of sulfate-reducing bacteria , when the small number of sulfate-reducing bacteria , dissolved oxygen reduction reaction to two The electronic reaction master , into an electronic response mainly sulfate-reducing bacteria in larger quantities .

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