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08052 Flow-Induced Corrosion of Al-Zn-Mg Galvanic Anodes in Seawater

Product Number: 51300-08052-SG
ISBN: 08052 2008 CP
Author: Juan Genesca and Marcela C. Quevedo
Publication Date: 2008
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The effect of hydrodynamics on the corrosion of Al – 14 wt% Zn – 8 wt% Mg alloy in artificial seawater media at room temperature was studied in a rotating cylinder electrode, RCE, system under turbulent flow conditions. Five different rotation rates were studied: 0 (or stagnant conditions), 1000, 3000, 5000 and 7000 rpm. The corrosion rates were measured by electrochemical impedance spectroscopy (EIS). For the system studied, corrosion potential, Ecorr becomes more positive with increasing of the rotation rate of RCE (Reynolds number, Re). The effect of increasing the Re number is to enhance the availability of oxygen at the electrode surface, which in turn will polarize the corrosion reaction in the more noble direction.
The effect of hydrodynamics on the corrosion of Al – 14 wt% Zn – 8 wt% Mg alloy in artificial seawater media at room temperature was studied in a rotating cylinder electrode, RCE, system under turbulent flow conditions. Five different rotation rates were studied: 0 (or stagnant conditions), 1000, 3000, 5000 and 7000 rpm. The corrosion rates were measured by electrochemical impedance spectroscopy (EIS). For the system studied, corrosion potential, Ecorr becomes more positive with increasing of the rotation rate of RCE (Reynolds number, Re). The effect of increasing the Re number is to enhance the availability of oxygen at the electrode surface, which in turn will polarize the corrosion reaction in the more noble direction.
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