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Corrosion Properties of Ni-Al Bronze and it’s Main Alloying Elements - Effect of pH

The work is mainly focused on the corrosion mechanism at low pH (>4) and the order of which the discontinuous and continuous intermetallic phases dissolve. Compositions of each phase, and the area ratio between intermetallic phases and the alpha matrix have been calculated as an average of 20 measurements.

Product Number: 51317--9306-SG
ISBN: 9306 2017 CP
Author: Hedda Krogstad
Publication Date: 2017
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Heavy corrosion ofNi-Al Bronze in an industrial construction operating in seawaterhas given reason to further investigate thecorrosion-propertiesof this alloyin marine environments including the effect of pH.Astudy on the microstructure and phase-composition ofthe alloywas followed by electrochemical tests and surface- and cross section characterization of both the alloy andit's main alloying elements; copper aluminium nickel and iron.Allexperiments were conductedatpH?8 and pH?3-4 in synthetic seawater at room temperature. The electrochemical tests included recording of the corrosion potential andpolarization curves for all the materials included in the work and additionalpotensiostaticpolarization toanodic potentials ofNi-Al Bronze.The results of this workgive clear indications of a strong pH dependency on the corrosion mechanism for Ni-Al Bronze and that nickel and aluminium are the main elements contributing to this dependency.

Key Words: Ni-Al Bronze, Alloy, Microstructure, pH, Seawater, Corrosion

Heavy corrosion ofNi-Al Bronze in an industrial construction operating in seawaterhas given reason to further investigate thecorrosion-propertiesof this alloyin marine environments including the effect of pH.Astudy on the microstructure and phase-composition ofthe alloywas followed by electrochemical tests and surface- and cross section characterization of both the alloy andit's main alloying elements; copper aluminium nickel and iron.Allexperiments were conductedatpH?8 and pH?3-4 in synthetic seawater at room temperature. The electrochemical tests included recording of the corrosion potential andpolarization curves for all the materials included in the work and additionalpotensiostaticpolarization toanodic potentials ofNi-Al Bronze.The results of this workgive clear indications of a strong pH dependency on the corrosion mechanism for Ni-Al Bronze and that nickel and aluminium are the main elements contributing to this dependency.

Key Words: Ni-Al Bronze, Alloy, Microstructure, pH, Seawater, Corrosion

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04294 Corrosion Assessment of Nickel Aluminum Bronze (NAB) in Seawater

Product Number: 51300-04294-SG
ISBN: 04294 2004 CP
Author: Kunigahalli L. Vasanth and Richard A. Hays, Naval Surface Warfare Center
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