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The Electrochemical Behavior of α,β′-Brass in Basic NaNO3Solutions

Berne, Clément and Andrieu, Eric and Reby, Jean and Sobrino, Jean-Michel and Blanc, Christine The Electrochemical Behavior of α,β′-Brass in Basic NaNO3Solutions. (2015) Journal of The Electrochemical Society (JES), 162 (12). C648-C656. ISSN 0013-4651

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Official URL: https://doi.org/10.1149/2.0181512jes

Abstract

The electrochemical behavior of an α,β'-brass CuZn40Pb2 (CW617N) was studied in basic nitrate solutions with various basic pHs and nitrate ion concentrations. In all the chosen experimental conditions, corrosion at the open circuit potential proceeded by the galvanic coupling of the α and β' phases, leading to a surface dezincification of the β' phase. The study showed that the extent of the dezincification was affected by the presence of lead in the alloy but the pH was the major parameter. During polarization tests, a pseudo-passive or a passive stage followed by a breakdown was observed: corrosion phenomena mainly involved copper and zinc dissolution from the β' phase. At pH 11, a Cu2O/PbO layer was efficient in achieving passivity of the brass. At pH 12, a Cu(OH)2-rich surface layer was formed: it was not protective enough, and complete dissolution of the β' phase was observed leading to the removal of lead particles.

Item Type:Article
HAL Id:hal-02474691
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Centre Technique des Industries Mécaniques - CETIM (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:11 Feb 2020 14:23

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