Preparation and hot corrosion behaviour of two Co modified NiAl coatings on a Ni-based superalloy

Qixiang Fan, S.M. Jiang, Duoli Wu, Jun Gong, Chao Sun

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Two Co modified aluminide coatings with different Co contents were prepared by a combined method of pack cementation and chemical vapour deposition. The type-I hot corrosion tests of the two Co modified coatings together with the simple aluminide coating were carried out at 900 C. Results indicate that the addition of cobalt could improve the corrosion resistance of the coatings in the sulphate salts, but exacerbate the degradation of the coatings when chloride salt gets involved. The formation mechanism of the Co modified aluminide coatings and the corrosion mechanism during the corrosion test have been discussed as well.
Original languageEnglish
JournalCorrosion science
Volume76
Pages (from-to)373-381
ISSN0010-938x
DOIs
Publication statusPublished - 2013
Externally publishedYes

Keywords

  • Metal Coatings
  • Cobalt
  • SEM
  • Hot Corrosion
  • Sulphidation

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