IngentaConnect Corrosion and corrosion wear behaviour of plasma carburised Stell...

Authors: Chen, J.¹; Dong, H.²

Source: Tribology - Materials, Surfaces & Interfaces, Volume 3, Number 1, March 2009 , pp. 24-30(7)

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 carburised 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.

Keywords: CO-CR ALLOY; STELLITE 21; S PHASE; PLASMA CARBURISING; CORROSIVE WEAR

Document Type: Research article

DOI: 10.1179/175158309X419043

Affiliations: 1: The School of Metallurgy and Materials, the University of Birmingham, Birmingham B15 2TT, UK;, Email: j.chen.2@bham.ac.uk 2: The School of Metallurgy and Materials, the University of Birmingham, Birmingham B15 2TT, UK

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