Electrochemical behavior of NiAL and Ni3Al intermetallic coatings in 1.0 m NaOH solution

J. Porcayo-Calderon*, O. Sotelo-Mazon, A. Luna-Ramirez, E. Porcayo-Palafox, V. M. Salinas-Bravo, L. Martinez-Gomez

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Three different grain sizes were used to deposit NiAl and Ni3Al intermetallic coatings on 304 type SS by thermal spraying powder and HVOF (High Velocity Oxygen Fuel) processes. Coatings were characterized by scanning electron microscopy and their characteristics are described as a function of particle size and coating process applied. The corrosion resistance of coatings was evaluated through open circuit potential, potentiodynamic polarization and linear polarization resistance tests in a 1.0 M NaOH solution at room temperature (25 °C). It was observed that the spray process and the particle size have an effect on the electrochemical behavior of coatings tested. Different coatings showed no significant variations in current densities, but were one order of magnitude greater than those of the base alloy; corrosion potentials of coatings were more negative than those of its base alloy regardless of particle size and have similar values.

Original languageEnglish
Pages (from-to)6241-6256
Number of pages16
JournalInternational Journal of Electrochemical Science
Volume10
Issue number8
StatePublished - 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 The Authors.

Keywords

  • Corrosion
  • HVOF
  • Intermetallics coatings
  • Nickel aluminides
  • Thermal spray

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