The effect of electropolishing parameter on 316L stainless steel surface roughness for coronary stent application

2017 ◽  
Author(s):  
Kholqillah Ardhian Ilman ◽  
Muhammad Kusumawan Herliansyah
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Steel Surface ◽  
316L Stainless Steel ◽  
Coronary Stent ◽  
Stainless Steel Surface

scholarly journals Synthesis and Characterization of New Polymers Bearing Tetrazole and Triazole Moieties with Studying their Corrosion Protection of Stainless Steel Surface in Hydrochloric Acid

2020 ◽  
pp. 2467-2478
Author(s):  
Amaal S. Sadiq ◽  
Entesar O. Al-Tamimi
Keyword(s):  
Stainless Steel ◽  
Corrosion Protection ◽  
Steel Surface ◽  
316L Stainless Steel ◽  
Electrochemical Polymerization ◽  
Triazole Ring ◽  
Phenyl Isothiocyanate ◽  
Stainless Steel Surface ◽  
Nano Materials ◽  
Atomic Force

A series of polymers containing1,2,4-triazole  and tetrazole groups in their main chains were synthesized through several steps. Poly(acryloyl hydrazide) was first prepared and then subjected to a hydrazide reaction with phenyl isothiocyanate to give a 1,2,4-triazole ring (2). This polymer was introduced into a reaction with chloro acetylchloride to yield polymer (3), which was refluxed with sodium azide to give polymer (4). Polymer (5) was synthesized by the reaction of polymer (4) with  acrylonitrile in the presence of NH4Cl as a catalyst. Finally, polymer (6) was synthesized by the electrochemical polymerization of polymer (5) using  316L stainless steel as an anti-corrosion coating. Polymer-coated and uncoated stainless steel was tested for corrosion safety in a solution of 0.1 M HCl, followed by Tafel and Potentiostatic procedures at a temperature of 293 K. Nano materials such as ZnO were applied to the monomer solution at different concentrations to enhance the corrosion resistance of the 316L stainless steel surface. The results showed that the performance values of corrosion protection for the polymer coating were increased with the introduction of the nano materials. Furthermore, 13C-NMR, 1H-NMR, and FTIR were recorded to confirm the structures of the poylmers, while their physical properties were tested using atomic force microscope (AFM) and scanning electron microscope (SEM).

Effects of Inoculation Level, Material Hydration, and Stainless Steel Surface Roughness on the Transfer of Listeria monocytogenes from Inoculated Bologna to Stainless Steel and High-Density Polyethylene

2007 ◽  
Vol 70 (6) ◽  
pp. 1423-1428 ◽  
Author(s):  
ANDRÉS RODRÍGUEZ ◽  
WESLEY R. AUTIO ◽  
LYNNE A. McLANDSBOROUGH
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Listeria Monocytogenes ◽  
High Density Polyethylene ◽  
Steel Surface ◽  
Testing Machine ◽  
High Density ◽  
Stainless Steel Surface ◽  
Material Type ◽  
The Absolute

The influence of inoculation level, material hydration, and stainless steel surface roughness on the transfer of Listeria monocytogenes from inoculated bologna to processing surfaces (stainless steel and polyethylene) was assessed. Slices of bologna (14 g) were inoculated with Listeria at different levels, from 105 to 109 CFU/cm2. Transfer experiments were done at a constant contact time (30 s) and pressure (45 kPa) with a universal testing machine. After transfer, cells that had been transferred to sterile stainless steel and polyethylene were removed and counted, and the efficiency of transfer (EOT) was calculated. As the inoculation level increased from 105 to 109 CFU/cm2, the absolute level of transfer increased in a similar fashion. By calculating EOTs, the data were normalized, and the initial inoculation level had no effect on the transfer (P > 0.05). The influence of hydration level on stainless steel, high-density polyethylene, and material type was investigated, and the EOTs ranged from 0.1 to 1 under all the conditions tested. Our results show that transfers to wetted processing surfaces (mean EOT = 0.43) were no different from dried processing surfaces (mean EOT = 0.35) (P > 0.05). Material type was shown to be a significant factor, with greater numbers of Listeria transferring from bologna to stainless steel (mean EOT = 0.49) than from bologna to polyethylene (mean EOT = 0.28) (P < 0.01). Stainless steel with three different surface roughness (Ra) values of <0.8 μm (target Ra = 0.25, 0.50, and 0.75 μm) and two different finishes (mechanically polished versus mechanically polished and further electropolished) was used to evaluate its effect on the transfer. The surface roughness and finish on the stainless steel did not have any effect on the transfer of Listeria (P > 0.05). Our results showed that when evaluating the transfer of Listeria, the use of EOTs rather than the absolute transfer values is essential to allow comparisons of transfer conditions or comparisons between research groups.

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