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LOCALIZED CORROSION SUSCEPTIBILITY OF COPPER-NICKEL ALLOYS IN CHLORIDE CONTAINING ENVIRONMENTS

Marta A. Jakab, Andre M. Anderko

2007encorrosioncopper-nickellocalizedchloridealloys

Abstract

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Under alkaline conditions, copper-nickel alloys are covered by passive oxide films containing Cu and Ni oxides. In chloride ion containing environments, they are therefore susceptible to localized corrosion. This paper investigates the susceptibility of selected Cu-Ni alloys (UNS C70600, UNS C71500, and UNS N04400) to localized corrosion by measuring the crevice stabilization and repassivation potentials (Ecrev and Ercrev) in alkaline sodium chloride solutions. It establishes correlations between environmental variables, such as chloride ion concentration, pH, and temperature, with respect to Ecrev and Ercrev. The results indicated that Ecrev and Ercrev decrease with increasing chloride ion concentration and that there is a linear relationship between Ecrev and Ercrev and the logarithm of chloride ion concentration. Furthermore, Ercrev remains unaffected by solution pH, while a complex relationship exists between Ecrev, Ercrev, alloy composition, and temperature. Additionally, the electrochemical properties of the selected alloys were examined in synthetic seawater with and without free chlorine, revealing that the presence of free chlorine significantly increased the corrosion potential and altered the corrosion morphology.

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Cite This Work

@article{f936c701-0164-462c-b46a-70be9cc27599,
  title={LOCALIZED CORROSION SUSCEPTIBILITY OF COPPER-NICKEL ALLOYS IN CHLORIDE CONTAINING ENVIRONMENTS},
  author={Marta A. Jakab and Andre M. Anderko},
  year={2007},
  language={en}
}
TY  - JOUR
TI  - LOCALIZED CORROSION SUSCEPTIBILITY OF COPPER-NICKEL ALLOYS IN CHLORIDE CONTAINING ENVIRONMENTS
AU  - Marta A. Jakab
AU  - Andre M. Anderko
PY  - 2007
LA  - en
ER  -

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