A STUDY ON THE CORROSION MECHANISM OF CARBONSTEEL IN FLOWING 3% NaCl SOLUTION
碳钢在流动3%氯化钠溶液中的腐蚀机理的探讨

A simulating test apparatus is Used to study the corrosion of carbon steel in flowing 3%NaCl solution and the efiect of applied cathodic current on the corrosion process. The experimental result shows that the corrosion rate of carbon steel increases with the increasing of flow Velocity, and there is a critical flow velocity. When the flow velocity is below the critical one the corrosion is mainly controlled by electrochemical factor,while over the critical flow velocity the hydrodynamic factor plays a prominent role in the corrosion of carbon steel,and the synergism between hydrodynamic factor and electrochemical factor is enhanted,causing corrosion rate of carbon steel to increase grearly.The application of cathodic current not only restrains the corrosion caused by electrochemical factor but also markedly weakens the synergism between them,thus the corrosion rate decreases rapidly.