Crevice corrosion of nickel superalloy in deaerated chloride/sulphate solution at 90°C

Alloy 22 is a nickel base alloy highly resistant to all forms of corrosion. It was designed to resist to most aggressive environments for industrial applications. Electrochemical studies such as Potentiodynamic-Galvanostatic-Potentiostatic (PD-GS-PD) tests and Electrochemical Impedance Spectroscopy...

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Bibliographic Details
Published in:Journal of physics. Conference series 2017-01, Vol.786 (1), p.12034
Main Authors: Ortiz, M Rincón, Carranza, R M, Rodríguez, M A
Format: Article
Language:English
Subjects:
Corrosion
Corrosion effects
Corrosion rate
Corrosion resistance
Crevice corrosion
Electrochemical impedance spectroscopy
Industrial applications
Nickel base alloys
Physics
Sodium chloride
Superalloys
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Summary:Alloy 22 is a nickel base alloy highly resistant to all forms of corrosion. It was designed to resist to most aggressive environments for industrial applications. Electrochemical studies such as Potentiodynamic-Galvanostatic-Potentiostatic (PD-GS-PD) tests and Electrochemical Impedance Spectroscopy (EIS) and Scanning Electron Microscopy (SEM) observations were performed to determine the corrosion behaviour of alloy 22 (N06022). The effect of sulphate ion in chloride containing solutions at 90°C, were studied in this work under aggressive conditions where this material might be susceptible to crevice corrosion. The electrolyte solution, which consisted of 0.1M and 1M NaCl and different sulphate concentrations. It was observed that there were complete inhibitions of crevice corrosion for Rcrit=[SO4=]/[Cl-]=1 in the 0.1mol/L NaCl solutions and Rcrit=2 in the 1mol/L NaCl solutions. The corrosion rate obtained was about 0.1μm/year at 24 hours of immersion.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/786/1/012034