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A Method for Determining Safe Concentrations of Chloride Ions in Pitting Corrosion of Steels in Nitr |
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24.11.2008 г. |
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A Method for Determining Safe Concentrations of Chloride Ions in Pitting Corrosion of Steels in Nitrate Media V. P. Razygraev*, M. V. Lebedeva, and I. I. Korchak Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, 119991 Russia *e-mail:
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Received April 17, 2007 Abstract — Features of how pitting corrosion develops on steels in nitrate–chloride media are analyzed, and the disadvantages of certain well-known electrochemical methods used to determine safe ratios of components under such conditions are found. A principally new approach to determining these parameters is proposed, based on the induction of intense pitting in definitely aggressive media with subsequent suppression of this process by continuously dilution of the solution or by gradual addition of an inhibitor. Equations are obtained for determining safe component concentrations depending on the volume of solution passing through the cell. Using the proposed method, safe ratios of components are determined for 12Kh18N10T chromium–nickel steel at chloride ion concentrations within 0.02–2.0 M. DOI: 10.1134/S0033173208070163
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