Probing Layered Structure of Inconel 625 Coatings Prepared by Magnetron Sputtering

Jinghua Feng, Guangcui Yuan, Li Mao, Juscelino Leão, Ryan Bedell, Kemal Ramic, Emily Stefanis, Youyang Zhao, Judith Vidal, Li Liu

Research output: Contribution to journalArticlepeer-review

5 Scopus Citations

Abstract

Coating/substrate interface and oxide layers present in Inconel 625 film may cause significant impacts on its corrosion behavior. However, layered structure of Inconel 625 coatings remains poorly understood due to its requirement of high spatial resolution. This study applies X-ray reflectometry (XRR) to probe the layered structure of magnetron-sputtered Inconel 625 film with atomic spatial resolution. Our results indicate that there exists a 2 nm thick Cr-rich Inconel sublayer underneath the principal film. On top of the principal film, it is found a 2 nm thick oxide layer mainly consisting of NiO. In addition, we detected ~2 Å contamination layer on the sapphire substrate, although argon ion sputter cleaning had been applied to the substrate prior to deposition. By comparing the coatings with different deposition time, we observed that the thickness of principal Inconel 625 layer grows linearly with deposition time, with all other layers remaining constant. Our findings provide insight into the layered structures of Inconel 625 coatings with atomic-scale spatial resolution, and provide directions for future efforts that aim to improve the corrosion resistance of Inconel 625 coatings.

Original languageAmerican English
Article number126545
Number of pages8
JournalSurface and Coatings Technology
Volume405
DOIs
StatePublished - 15 Jan 2021

Bibliographical note

Publisher Copyright:
© 2020 Elsevier B.V.

NREL Publication Number

  • NREL/JA-5700-77748

Keywords

  • Coating/substrate interface
  • Inconel 625 alloy coating
  • Magnetron sputtering
  • Oxide layer
  • X-ray reflectometry

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