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Establishment and Experimental Verification of Hydrodynamic Model for Impingement Corrosion Apparatus |
ZOU Guanchi, SHEN Hanjie, LI Chenglin, YONG Xingyue |
Beijing University of Chemical Technology, Beijing 100029, China |
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Abstract A high-speed impingement corrosion apparatus was manufactured and its jetting velocity reached maximal 150 m/s. This apparatus could be connected with electrochemical workstation for electrochemical test. Based on the hydrodynamic theory, an impingement hydrodynamic model was built and the relationships of jetting velocity, impingement force, surface shear stress with jetting pressure were separately studied and verified by experimental methods. The impingement corrosion of stainless steel was studied by mass loss and electrochemical methods. It was found that the impingement force induced by jetting flow had great influence on impingement corrosion and corrosion morphology, and that the combination of impingement force and surface shear stress changed the anodic polarization process and accelerated electrochemical corrosion. The impingement force parameter was more reasonable for describing impingement corrosion compared with surface shear stress.
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