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Effect of Weak Acid Additions on the General and Localized Corrosion Susceptibility of Alloy 22 in Chloride Solutions

Published online by Cambridge University Press:  01 February 2011

Ricardo M. Carranza ,
C. Mabel Giordano ,
Martín A. Rodríguez  and
Raul B. Rebak
Ricardo M. Carranza
Affiliation:
Comisión Nacional de Energìa Atómica, Av. Gral. Paz 1499 San Martìn, 1650 Buenos Aires, Argentina
C. Mabel Giordano
Affiliation:
Comisión Nacional de Energìa Atómica, Av. Gral. Paz 1499 San Martìn, 1650 Buenos Aires, Argentina
Martín A. Rodríguez
Affiliation:
Comisión Nacional de Energìa Atómica, Av. Gral. Paz 1499 San Martìn, 1650 Buenos Aires, Argentina
Raul B. Rebak
Affiliation:
Comisión Nacional de Energìa Atómica, Av. Gral. Paz 1499 San Martìn, 1650 Buenos Aires, Argentina Lawrence Livermore National Laboratory, PO Box 808 L-631, 7000 East Ave. Livermore, CA, 94550, U.S.A.
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Abstract

Electrochemical studies such as cyclic potentiodynamic polarization (CPP) and electrochemical impedance spectroscopy (EIS) were performed to determine the corrosion behavior of Alloy 22 (N06022) in 1M NaCl solutions at various pH values from acidic to neutral at 90°C. All the tested material was wrought Mill Annealed (MA). Tests were also performed in NaCl solutions containing weak organic acids such as oxalic, acetic, citric and picric acids.

Results show that the CR of Alloy 22 was significantly higher in solutions containing oxalic acid than in solutions of pure NaCl at the same pH. Citric and Picric acids showed a slightly higher CR, and Acetic acid maintained the CR of pure chloride solutions at the same pH. Organic acids revealed to be weak inhibitors for crevice corrosion. Higher concentration ratios, compared to nitrate ions, were needed to completely inhibit crevice corrosion in chloride solutions.

Results are discussed considering acid dissociation constants, buffer capacity and complex formation constants of the different weak acids.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1107: Scientific Basis for Nuclear Waste Management XXXI , 2008 , 511
Copyright
Copyright © Materials Research Society 2008

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