Effect of Solution Temperature on the Cavitation Corrosion Properties of Carbon Steel and its Electrochemical Effect
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In the open system (vessel and pipe), the maximum corrosion rate of carbon steel at ca. 80 oC was obtaineddue to the decrease of dissolved oxygen by increasing the solution temperature. Effect of temperature onthe cavitation damage can be explained through several mechanisms. Moreover, when cavitation occurs onthe surface of metal and alloys, whether cavitation is erosion or corrosion is still controversial. This workfocused on the effect of solution temperature on the corrosion of carbon steel under cavitation in an opensystem, Tests were performed using an electrochemical cavitation corrosion tester in 3.5% NaCl solutionand the effect of solution temperature of carbon steel was discussed. Cavitation corrosion rate can beincreased by cavitation, but when the temperature increases, a dissolved oxygen content reduces at a veryhigh speed and thus the maximum cavitation corrosion temperature changed from 80 oC to 45 oC. Belowthe maximum cavitation temperature, the electrochemical effect was more dominant than the mechanicaleffect by increasing temperature, but over the maximum cavitation temperature, the mechanical effect wasmore dominant than the electrochemical effect by increasing temperature.
Abstract
In the open system (vessel and pipe), the maximum corrosion rate of carbon steel at ca. 80 oC was obtaineddue to the decrease of dissolved oxygen by increasing the solution temperature. Effect of temperature onthe cavitation damage can be explained through several mechanisms. Moreover, when cavitation occurs onthe surface of metal and alloys, whether cavitation is erosion or corrosion is still controversial. This workfocused on the effect of solution temperature on the corrosion of carbon steel under cavitation in an opensystem, Tests were performed using an electrochemical cavitation corrosion tester in 3.5% NaCl solutionand the effect of solution temperature of carbon steel was discussed. Cavitation corrosion rate can beincreased by cavitation, but when the temperature increases, a dissolved oxygen content reduces at a veryhigh speed and thus the maximum cavitation corrosion temperature changed from 80 oC to 45 oC. Belowthe maximum cavitation temperature, the electrochemical effect was more dominant than the mechanicaleffect by increasing temperature, but over the maximum cavitation temperature, the mechanical effect wasmore dominant than the electrochemical effect by increasing temperature.
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