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This paper will present two case studies of pre-mature failure of process equipment in seawater service which will illustrate the influence of metallurgical structure on the service performance of Nickel-Aluminum Bronze in marine environments.
Influence of Metallurgical Structure on the Service Performance ofNi-Al Bronze Process Equipment in Marine EnvironmentsNickel-Aluminum Bronzes often referred to as NAB are a group of Cu-based alloys containing about 3-6% Ni 8-11% Al 3-5% Fe and 1-3% Mn. These alloys have excellent physical properties such as fatigue creep and wear as well as excellent resistance to different forms of corrosion such as general corrosion cavitation erosion and de-alloying. Hence they find widespread use in marine environments as components of ships and industrial process equipment handling seawater. However the corrosion resistance of these alloys can be adversely effected by their metallurgical structure which in turn depends uponhe exact composition of the material and their manufacturing history - especially the thermal treatment to which they have been subjected.This paper will present two case studies of pre-mature failure of process equipment in seawater service which will illustrate the influence of metallurgical structure on the service performance of NAB in marine environments.Key words: Ni-Al-Bronze metallurgical structure marine environments.
Key words: Ni-Al-Bronze, metallurgical structure, marine environments
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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.