Corrosion and corrosion wear behaviour of plasma carburised stellite 21 Co-Cr alloy

J. Chen, H. Dong

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Low temperature plasma surface alloying with carbon (i.e. plasma carburising) of Stellite 21 Co- Cr alloy was conducted at temperatures from 400 to 500°C for 15 h in a gas mixture of 98 vol.-%H2 and 2 vol.-%CH4. The surface treated layers were characterised by XRD, SEM and microhardness tests. The corrosion and corrosive wear behaviour of the plasma carburized Stellite 21 Co-Cr alloy were studied respectively using electrochemical tests and well designed reciprocating wear tests in 3.5% NaCl solution. The results show that low temperature ((≤460°C) plasma carburising can improve the corrosion resistance of Stellite 21 alloy; the corrosive wear resistance of Stellite 21 can be enhanced by up to three times; and the best corrosive wear resistance is achieved at the highest treating temperature (500°C). The detailed studies on the wear tracks indicate that the corrosive wear process was dependent on the individual wear and corrosion, as well as the synergetic effect.

Original languageEnglish
Pages (from-to)24-30
Number of pages7
JournalTribology - Materials, Surfaces and Interfaces
Volume3
Issue number1
DOIs
Publication statusPublished - 2009

Keywords

  • Co-Cr alloy
  • Corrosive wear
  • Plasma carburising
  • S phase
  • Stellite 21

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanical Engineering

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