Hot corrosion behavior of a Cr-modified aluminide coating on a Ni-based superalloy

Duoli Wu, Sumeng Jiang, Qixiang Fan, Jun Gong, Chao Sun

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A Cr-modified aluminide coating is prepared on a Ni-based superalloy using arc ion plating and subsequent pack cementation aluminizing. Hot corrosion behavior of the Cr-modified aluminide coating exposed to molten Na2SO4/K2SO4 (3:1) or Na2SO4/NaCl (3:1) salts at 900 C in static air are evaluated as well as the aluminide coating. The results indicate that compared with the aluminide coating, the anti-corrosion properties of the Cr-modified aluminide coating in the both salts are improved, which should be attributed to the beneficial effect of the Cr in the coating. The corrosion mechanism of the Cr-modified aluminide coating, especially the role of Cr in the mixture salt corrosion, is discussed.
Original languageEnglish
JournalActa Metallurgica Sinica
Volume27
Issue number4
Pages (from-to)627-634
ISSN1006-7191
DOIs
Publication statusPublished - 2014
Externally publishedYes

Keywords

  • Arc Ion Plating
  • Pack Cementation Aluminizing
  • Superalloy
  • CR-modified Aluminide Coating
  • Hot Corrosion

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