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    Electropolishing of medical-grade stainless steel in preparation for surface nano-texturing

    183359_183359.pdf (788.4Kb)
    Access Status
    Open access
    Authors
    Nazneen, F.
    Galvin, P.
    Arrigan, Damien
    Thompson, M.
    Benvenuto, P.
    Herzog, G.
    Date
    2012
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Nazneen, Feroze and Galvin, Paul and Arrigan, Damien W.M. and Thompson, Michael and Benvenuto, Pasquale and Herzog, Gregoire. 2012. Electropolishing of medical-grade stainless steel in preparation for surface nano-texturing. Journal of Solid State Electrochemistry. 16 (4): pp. 1389-1397.
    Source Title
    Journal of Solid State Electrochemistry
    DOI
    10.1007/s10008-011-1539-9
    ISSN
    1432-8488
    School
    Department of Applied Chemistry
    Remarks

    The final publication is available at: http://www.springerlink.com

    NOTICE: This is the author’s version of a work in which changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication.

    URI
    http://hdl.handle.net/20.500.11937/46821
    Collection
    • Curtin Research Publications
    Abstract

    The purpose of this work is to investigate the electropolishing of medical grade 316L stainless steel to obtain a clean, smooth and defect free surface in preparation for surface nano-texturing. Electropolishing of steel was conducted under stationary conditions in four electrolyte mixtures: A) 4.5 M H2SO4 + 11 M H3PO4, B) 7.2 M H2SO4 + 6.5 M H3PO4, C) 6.4 M glycerol + 6.1 M H3PO4 and D) 6.1 M H3PO4. The influence of electrolyte composition and concentration, temperature and electropolishing time, in conjunction with linear sweep voltammetry and chronoamperometry, on the stainless steel surface was studied. The activation energies for dissolution of steel in the four electrolyte solutions were calculated. The resulting surfaces of unpolished and optimally-polished stainless steel were characterised in terms of contamination, defects, topography, roughness, hydrophilicity and chemical composition by optical and atomic force microscopies, contact angle goniometry and x-ray photoelectron spectroscopy. It was found that the optimally polished surfaces were obtained with the following parameters: electrolyte mixture A at 2.1 V applied potential, 80 °C for 10 minutes. This corresponded to the diffusion-limited dissolution of the surface. The root mean square surface roughness of the electropolished surface achieved was 0.4 nm over 2 x 2 μm2. Surface analysis showed that electropolishing led to ultraclean surfaces with reduced roughness and contamination thickness, and with Cr, P, S, Mo, Ni and O enrichment compared to untreated surfaces.

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