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b Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg
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A rapid screening multi-electrode method for the evaluation of corrosion inhibitorsElectrochimica Acta, 54
(2009)
project number IOP-SHM0633. References [1] J. Sinko,
CSIRO Materials Scienceand Technology, PrivateBag 33, Clayton South MDC, Victoria3169,Australia
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Introducing the ME in the solution with acertain inhibitor and pH during 30 min at the open circuit potential
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The effect of strontium and chromate ions on the inhibition of zincSurface & Coatings Technology, 185
,Box312,ClaytonSouthMDC,Victoria3169,Australia
a FacultyofMechanical,MaritimeandMaterialsEngineering,DelftUniversityofTechnology,Mekelweg2,2628CD,Delft,TheNetherlands
Aiming the assessment of novel, environmentally friendly corrosion inhibitors that can substitute chromate‐based ones, this work describes and validates a method for the rapid screening of water‐soluble inhibitors. The technique involves a fixed potential being applied between identical electrodes while immersed in an inhibitive solution and with the absence of a reference electrode. The current flowing between the electrodes is measured and the combined electrochemical response of the anodic and cathodic reactions, with and without the inhibitor, is then characterized. The incorporation of nine pairs of different metallic wires into a single assembly enables the effect of inhibitors on different metals to be assessed rapidly. The methodology presented allows approximately 30 electrochemical experiments to be performed per hour. In order to prove the usefulness of the proposed rapid screening technique (multielectrode), results obtained with the multielectrode are validated by comparison to the results obtained with a single electrode using only AA2024‐T3. The accuracy, reproducibility and parameter dependence has been assessed with the variation of inhibitor type and solution pH. Low absolute errors are found when studying inhibitors with good performance, giving confidence that no good inhibitors would be missed by this rapid screening method. The effect of cross‐contamination has been assessed and found to be negligible for almost all the pH range. Copyright © 2009 John Wiley & Sons, Ltd.
Surface and Interface Analysis – Wiley
Published: Apr 1, 2010
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