LASER CLADDING OF COLMONOY 6 PARTICLES ON INCONEL 625 SUBSTRATE: MICROSTRUCTURE AND CORROSION RESISTANCE

N. Jeyaprakash*, Che Hua Yang, Sundara Subramanian Karuppasamy

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

4 Scopus citations

Abstract

Inconel 625 (IN 625) is a widely recognized nickel-based superalloy due to its high tensile strength, better fabricability, capability to prevent crack formation, acceptable corrosion resistance, etc. However, during the long-term usage, the formed oxide layers are converted into dichromates which reduce the anti-corrosion behavior. This study attempts to improve the anti-corrosion characteristics of IN 625 by cladding it with Colmonoy 6 particles. Further, the corroded morphology, microstructure, hardness and roughness were analyzed. Results showed that the cladded specimens are rich in dendritic and interdendritic areas. These areas are reported to contain rich carbides and borides of Cr that are formed after cladding. These precipitates paved the way for improving the hardness of the Colmonoy-6-cladded layer (7.54 GPa) when compared with the base material (4.49 GPa). A strong and continuous passive film was reported on the cladded samples during the corrosion test which protects the cladded layer. Further, EIS study also reported that the Colmonoy-6-cladded specimens experience higher polarization resistance values due to the stable passive film and lower Ra values from the surface roughness measurements. Among the base and cladded samples, the 27-h cladded sample provides better corrosion resistance with greater Rp (142,940). In addition, this sample has the minimum roughness (Ra=2.761μm) value than the other samples.

Original languageEnglish
Article number2250102
JournalSurface Review and Letters
Volume29
Issue number8
DOIs
StatePublished - 01 08 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2022 World Scientific Publishing Company.

Keywords

  • Colmonoy 6
  • Inconel 625 substrate
  • Laser cladding
  • corrosion
  • nanohardness
  • surface roughness

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