Impedance Fitting of 254SMO and AISI 304 Stainless Steels Under Pitting Conditions

descriptionPublicationkeyboard_double_arrow_right Article 01 Aug 2002 English Publisher:Association for Materials Protection and Performance (AMPP)Journal:Corrosion, volume 58, pages 670-674 (issn: 0010-9312, eissn: 1938-159X,

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Authors: Polo, J. L.; Cano Díaz, Emilio; Kong, D. Y.; Bastidas Rull, José María;

doi: 10.5006/1.3287696

handle: 10261/114358

Impedance Fitting of 254SMO and AISI 304 Stainless Steels Under Pitting Conditions

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Abstract

Impedance measurements were performed on 254SMO stainless steel (SS; UNS S31254) and AISI 304 SS (UNS S30400) under pitting conditions in solutions containing chlorides at 25°C and 60°C. A complex nonlinear, least-squares program was used to determine the parameters of the transfer functions, including an ohmic resistor in series with a chain of series-connected, parallel, resistor-capacitor (RC) circuits. The impedance data satisfy Kramers-Kronig (K-K) transforms for UNS S31254 SS but do not fulfill K-K relations for UNS S30400 SS.

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Keywords

Kramers-Kronig relation, Transfer function, Stability analysis, Impedance data, Pitting corrosion, Austenitic stainless steels

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