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02280 MICROELECTROCHEMICAL EFFICIENCY EVALUATION OF INHIBITORS FOR CO2 CORROSION OF CARBON STEEL UNDER HIGH SHEAR STRESS GRADIENTS

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Product Number: 51300-02280-SG
ISBN: 02280 2002 CP
Author: G. Sehmitt, C. Werner, and M. J. Sch6ning
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With flush mounted mieroeleetrodes positioned in different distances from the center of a submerged jet, the wall shear stress distribution on the impinged surface can be measured up to jet nozzle flow velocities of 20 m/s with high lateral resolution. The paper shows for the first time that instead of using the hexacyanoferrate(II/III) redox system also the mass transport controlled cathodic hydrogen evolution from carbonic acid in CO2 solutions can be applied as a tracer system in electrochemical wall shear stress measurements. Thus, drag reduction and corrosion inhibition effects can now be measured in the same experiment. The drag reducing efficiency of corrosion inhibitors correlates well with the corrosion inhibition activity under comparable wall shear stress conditions and the critical mieelle concentration of the inhibitor. FFT data treatment of electrochemical flow noise measurements revealed that inhibitors like quaternary ammonium salts significantly reduce the frequencies and damp the amplitudes of near-wall turbulence elements.
With flush mounted mieroeleetrodes positioned in different distances from the center of a submerged jet, the wall shear stress distribution on the impinged surface can be measured up to jet nozzle flow velocities of 20 m/s with high lateral resolution. The paper shows for the first time that instead of using the hexacyanoferrate(II/III) redox system also the mass transport controlled cathodic hydrogen evolution from carbonic acid in CO2 solutions can be applied as a tracer system in electrochemical wall shear stress measurements. Thus, drag reduction and corrosion inhibition effects can now be measured in the same experiment. The drag reducing efficiency of corrosion inhibitors correlates well with the corrosion inhibition activity under comparable wall shear stress conditions and the critical mieelle concentration of the inhibitor. FFT data treatment of electrochemical flow noise measurements revealed that inhibitors like quaternary ammonium salts significantly reduce the frequencies and damp the amplitudes of near-wall turbulence elements.
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