Improved resistance to cyclic oxidation of a nickel-based superalloy by high temperature etching treatment (HTET)

D. Itzhak, M. Schieber, F. R. Tuler

Research output: Contribution to journalArticlepeer-review

Abstract

A method to increase the cyclic oxidation resistance of a chromium and molybdenum rich nickel-based superalloy, Hastelloy-X (48 Ni22Cr18Fe9Mo), is presented, in which the cyclic oxidation resistance is increased at 1100°C. The time after which the total weight change becomes zero is increased from 100 to between 400 and 500 h. The method consists of thermally etching the alloy with gaseous hydrochloric acid (HCL) at 1100°C for approximately 0.5 h. The mechanism of the increased oxidation resistance was investigated using metallography, X-ray diffraction and electron microprobe analysis. As a result of the HTET, a thick and continuous protective subscale of Cr8O3 is formed during the oxidation which acts as an efficient diffusion barrier against further oxidation.

Original languageEnglish
Pages (from-to)413-420
Number of pages8
JournalCorrosion Science
Volume20
Issue number3
DOIs
StatePublished - 1 Jan 1980

ASJC Scopus subject areas

  • Chemistry (all)
  • Chemical Engineering (all)
  • Materials Science (all)

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