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Electropolishing of medical-grade stainless steel in preparation for surface nano-texturing
- Source :
- Journal of Solid State Electrochemistry, Journal of Solid State Electrochemistry, Springer Verlag, 2012, 16 (4), pp.1389-1397. ⟨10.1007/s10008-011-1539-9⟩
- Publication Year :
- 2011
- Publisher :
- Springer Science and Business Media LLC, 2011.
-
Abstract
- The purpose of this work is to investigate the electropolishing of medical-grade 316 L 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 resulting surfaces of unpolished and optimally polished stainless steel were characterized 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 of applied potential at 80 °C for 10 min. 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 × 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.
- Subjects :
- Materials science
020209 energy
Metallurgy
technology, industry, and agriculture
[CHIM.MATE]Chemical Sciences/Material chemistry
02 engineering and technology
Electrolyte
Surface finish
Chronoamperometry
021001 nanoscience & nanotechnology
Condensed Matter Physics
Contact angle
Electropolishing
X-ray photoelectron spectroscopy
Linear sweep voltammetry
0202 electrical engineering, electronic engineering, information engineering
Electrochemistry
Surface roughness
General Materials Science
Electrical and Electronic Engineering
0210 nano-technology
ComputingMilieux_MISCELLANEOUS
Subjects
Details
- ISSN :
- 14330768 and 14328488
- Volume :
- 16
- Database :
- OpenAIRE
- Journal :
- Journal of Solid State Electrochemistry
- Accession number :
- edsair.doi.dedup.....0252940f61d4c2490d4576fc5819644a