The influence of flow velocity on electrochemical reaction of metal surface

1st International Conference on Frontiers of Materials Synthesis and Processing

材料科学;化学

Li, Zhen^1 ; Zhang, Jiding^1

Department of Mechanical Engineering, Xian Shiyou University, Xian, China^1

关键词: Corrosive media;    Electrochemical parameters;    Electrochemical reactions;    Electrochemical systems;    High flow velocity;    Open circuit potential;    Polarization curves;    Wall shear stress;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/274/1/012098/pdf
DOI  :  10.1088/1757-899X/274/1/012098

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In order to find out the effect of fluid flow velocity on electrochemical reaction, the electrochemical parameters of super 13Cr stainless steel in 3.5% NaCl aqueous solution were measured by a jet flow system at different flow velocities. The electrochemical characters such as open-circuit potential and polarization curve were monitored online using a three-electrode electrochemical system. The results show that the increase of wall shear stress caused by the high flow velocity leads to the rupture of passive films and the exposure of fresh metal in the corrosive media, which causes the increase of corrosion rate. Meanwhile, the corrosion rate shows a significant growth when the flow velocity is less than 0∼10.0 m/s. But it gradually decreases after reaching a maximum value.