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Electrochemical study of corrosion behavior of wrought stellite alloys in sodium chloride and green death solutions

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1007/s11665-015-1629-4
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Affiliation
  1. National Research Council of Canada. Aerospace
FormatText, Article
SubjectCarbides; Corrosion; Corrosive effects; Electrochemical impedance spectroscopy; Oxide films; Pitting; Polarization; Potentiodynamic polarization; Sodium alloys; Sodium chloride; Stellite; Chemical compositions; Corrosion behavior; Cyclic polarization; Cyclic polarization curves; ELectrochemical methods; Electrochemical studies; Potentiodynamic polarization curves; Stellite alloy; Electrochemical corrosion
Abstract
Corrosion behavior of wrought Stellite 6B and Stellite 6K, which have similar chemical composition but contain different carbon content, in 3.5 wt.% NaCl solution and in Green Death solution is investigated using various electrochemical methods, including potentiodynamic polarization, cyclic polarization, and electrochemical impedance spectroscopy (EIS). The obtained potentiodynamic polarization curves, cyclic polarization curves, and EIS spectra for these alloys are in good agreement, showing that Stellite 6K with higher carbon content is easier corroded due to its larger volume fraction of carbides but the Cr<inf>2</inf>O<inf>3</inf> film formed on this alloy is stronger and more stable than that on Stellite 6B. Further immersion tests on these alloys show that Stellite 6K has less resistance to pitting corrosion.
Publication date
In
  • Journal of Materials Engineering and Performance 24, no. 9 (September 2015): 3579–3587.
LanguageEnglish
Peer reviewedYes
NPARC number21276900
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Record identifierf8fbe216-acfb-4424-bc21-db98b4045145
Record created2015-11-10
Record modified2020-04-22
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