Corrosion behaviour of carbon S-phase created on Ni-free biomedical stainless steel

Following the success of forming a carbon S-phase (expanded austenite) surface layer on medical grade Ni-free austenitic stainless steel by DC plasma carburising, the established commercial carburising process Kolsterising® was performed on both Ni-containing (AISI 304) and Ni-free austenitic stainl...

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Bibliographic Details
Published in:Surface & coatings technology 2012-04, Vol.206 (16), p.3479-3487
Main Authors: Formosa, Dennis, Hunger, Ralph, Spiteri, André, Dong, Hanshan, Sinagra, Emmanuel, Buhagiar, Joseph
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion environments
Crevice and pitting corrosion
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Expanded austenite
Intergranular corrosion
Kolsterising
Materials science
Metals. Metallurgy
Nickel free austenitic stainless steel
Physics
S-phase
Surface treatments
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Summary:Following the success of forming a carbon S-phase (expanded austenite) surface layer on medical grade Ni-free austenitic stainless steel by DC plasma carburising, the established commercial carburising process Kolsterising® was performed on both Ni-containing (AISI 304) and Ni-free austenitic stainless steels. While the Ni-containing stainless steel responded very well to Kolsterising®, the Ni-free alloy did not. The carbon absorption and the hardness of the Kolsterised® Ni-free alloy are inferior to Kolsterised® AISI 304 Ni-containing stainless steel, however, the hardness of the untreated Ni-free alloy was doubled by Kolsterising®. The response of both Kolsterised® Ni-free and Ni-containing alloys to pitting, crevice corrosion and intergranular corrosion resistance was similar. From this work it can be concluded that the Kolsterised® austenitic stainless steels do not suffer from intergranular corrosion but are susceptible to intragranular pitting when tested in boiling sulphuric acid and copper sulphate solution. It was also observed that Kolsterising® improves significantly the pitting and crevice corrosion resistance of the alloys used in this study. ► Biomedical Ni-free austenitic stainless steel was hardened by Kolsterising®. ► Augmentation of pitting and crevice corrosion resistance by Kolsterising®. ► Kolsterised® austenitic stainless steels do not suffer from intergranular corrosion. ► Reduction of chromium and nickel leached into the solution.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2012.02.020