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Vol.39, No.9, 1050 ~ 1058, 2001
Title
Research Papers / Environment : Flow - Accelerated Corrosion Characteristics of Galvanically Coupled Dissimilar Metals
최윤석Yoon Seok Choi,김정구Jung Gu Kim
Abstract
Flow accelerated galvanic corrosion characteristics of a carbon steel coupled to stainless steel were investigated in deaerated alkaline-chloride solutions as a function of flow velocities, pH and temperatures. The electrochemical properties of specimens were investigated by potentiodynamic test and galvanic corrosion test using RCE(Rotating Cylinder Electrode). Carbon steel showed active behavior in the deaerated alkaline-chloride solution. The galvanic current density of carbon steel increased with increasing flow velocity and temperature, but decreased with increasing pH. Flow velocity had a small effect on the galvanic current density at 25℃, whereas the flow velocity increased galvanic current density significantly at 50℃ and 75℃. This might be due to the increased solubility of magnetite at the higher temperatures.
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