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02332 RELATIONSHIPS BETWEEN ELECTROCHEMICAL NOISE, PIT DEPTH, AND PIT DENSITY IN METALLIC ALLOYS EXPOSED TO 3.5 WT% NACL SOLUTIONS

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Product Number: 51300-02332-SG
ISBN: 02332 2002 CP
Author: Ricardo J. Bogaert-Alvarez, Yonghyun Kim, Jaclyn M. Sekula, and James LaBuz
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Electrochemical noise experiments with pairs of electrodes were performed in 3.5 wt % NaCl aqueous solutions using four alloys: 430 stainless steel (SS) (UNS 43000), 304L SS (UNS 30403), 316L SS (UNS 31603), and alloy 276 (UNS N10276). With a zero-resistance ammeter (ZRA), data were collected on the following parameters: root-mean-square (RMS) current and the absolute maximum current. Through microscopic observations, the following surface results were recorded: pit average depth, pit maximum depth, pit density, and differences in pit densities. Except for the latter result, the surface results are the average of both electrodes in an experiment. This paper examines the relationships between the noise currents and the surface results. Direct comparisons of the electrochemical parameters with the surface parameters yielded poor correlations. When the average values of the parameters for a given alloy were employed for the correlations, two main conclusions were drawn: 1) larger pit densities produce higher absolute maximum currents; 2) greater maximum penetration depth resulted in higher RMS currents.
Electrochemical noise experiments with pairs of electrodes were performed in 3.5 wt % NaCl aqueous solutions using four alloys: 430 stainless steel (SS) (UNS 43000), 304L SS (UNS 30403), 316L SS (UNS 31603), and alloy 276 (UNS N10276). With a zero-resistance ammeter (ZRA), data were collected on the following parameters: root-mean-square (RMS) current and the absolute maximum current. Through microscopic observations, the following surface results were recorded: pit average depth, pit maximum depth, pit density, and differences in pit densities. Except for the latter result, the surface results are the average of both electrodes in an experiment. This paper examines the relationships between the noise currents and the surface results. Direct comparisons of the electrochemical parameters with the surface parameters yielded poor correlations. When the average values of the parameters for a given alloy were employed for the correlations, two main conclusions were drawn: 1) larger pit densities produce higher absolute maximum currents; 2) greater maximum penetration depth resulted in higher RMS currents.
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02288 EVALUATION OF INHIBITOR PERFORMANCE FOR PROTECTION AGAINST LOCALIZED CORROSION

Product Number: 51300-02288-SG
ISBN: 02288 2002 CP
Author: J. Marsh, J. W. Palmer and R. C. Newman
Publication Date: 2002
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 A novel evaluation technique, based on an artificial pit electrode, has been developed for inhibitor studies. The first example is of three generic inhibitors, against localised corrosion. The second is of three industrial inhibitors against existing localised corrosion on a north sea production platform
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02329 MEASURES FOR THE IDENTIFICATION OF LOCALIZED CORROSION FROM ELECTROCHEMICAL NOISE MEASUREMENTS

Product Number: 51300-02329-SG
ISBN: 02329 2002 CP
Author: R.A. Cottis, H.A. Al-Mazeedi and S. Turgoose
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02274 EFFECTIVENESS OF CORROSION INHIBITORS IN RETARDING PROPAGATION OF LOCALISED CORROSION

Product Number: 51300-02274-SG
ISBN: 02274 2002 CP
Author: A. Turnbull, D. Coleman, A.J. Griffiths, P.E. Francis, and L. Orkney
Publication Date: 2002
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In many service applications excursions in solution chemistry, temporary loss of inhibitor, or transient increases in temperature may give rise to localised corrosion. To test the return of inhibition when the loss is remedied, the use of an artificial pit has been investigated using simulations of cooling water and of of oil production formation water.
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