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Wyszukujesz frazę "electropolishing" wg kryterium: Temat

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    Wyświetlanie 1-9 z 9
    Tytuł:
    Parameters Selection for Electropolishing Process of Products Made of Copper and its Alloys
    Autorzy:
    Maciąg, T.
    Wieczorek, J.
    Węcki, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/356437.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electropolishing
    copper
    brass
    surface roughness
    Opis:
    Electropolishing is electrochemical method used in metal working that has a vital role in production of medical apparatus, in food or electric industry. The purpose of this paper is to determine optimal current parameters and time required for conducting electropolishing process from the perspective of changes of surface microgeometry. Furthermore, effect of different types of mechanical working used before electropolishing on final surface state was evaluated by observation in changes of topography. Research was conducted on electrolytic copper and brass. Analysis of surface geometry and its parameters (Ra, Sa) was used as criterion describing efficiency of chemical electropolishing. Results of the experiment allow for current parameter optimization of electrochemical polishing process for selected non-ferrous alloys with preliminary mechanical preparation of the surface.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1443-1447
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electropolishing Procedure Dedicated to In-Depth Stress Measurements with X-Ray Diffractometry
    Autorzy:
    Gadalińska, E.
    Wronicz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/97957.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    in-depth stress distribution
    electropolishing
    diffraction methods
    Opis:
    Electropolishing is the sole reliable method of removing the outer layer of the specimen without changing its stress state. This feature of the electropolishing procedure allows researchers to investigate the in-depth stress distribution. Developing of the method in a diffraction laboratory is crucial because there is no universal theory for the electropolishing procedure allowing the removal of the layers of different thickness. This is due to the multiplicity of different factors affecting the electropolishing results. A factor of vital importance from the point of view of indepth stress measurements is the thickness of the electropolishing layer. Hence the importance of the procedures for the electropolishing of a layer of a precisely defined thickness. This work deals with the problem of the selection of the parameters in the electropolishing process for two types of materials: stainless steel and aluminium alloy. The tests of mutual correlation of current intensity, voltage applied and time of the procedure and its results are presented in the paper.
    Źródło:
    Fatigue of Aircraft Structures; 2016, 8; 65-72
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of the stainless steel electropolishing process by organic additives
    Autorzy:
    Lochynski, P.
    Kowalski, M.
    Szczygiel, B.
    Kuczewski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/779206.pdf
    Data publikacji:
    2016
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    electropolishing
    organic additives
    surface roughness
    stainless steel
    Opis:
    The influence of organic additives on the process of surface electropolishing of AISI 304 type steel was determined. Additives were selected in initial potentiodynamic tests pursuant to the plateau analysis on the current/potential curves. The assessment of the operational effectiveness of additives consisted in determining the relationship between surface gloss after electropolishing and the mass loss of the sample and in determining surface roughness. The applied electropolishing bath consisted of a mixture of concentrated acids: H3PO4  and H2SO4 and the following organic additives were used: triethylamine, ethanolamine, diethanolamine, triethanolamine, diethylene glycol monobutyl ether and glycerol. The best electropolishing result, i.e. low roughness and high gloss of stainless steel surface with a relatively low mass loss of the sample at the same time were obtained for baths containing triethanolamine.
    Źródło:
    Polish Journal of Chemical Technology; 2016, 18, 4; 76-81
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Nitinol properties improvement after electrochemical treatments
    Autorzy:
    Hryniewicz, Tadeusz
    Rokicki, Ryszard
    Powiązania:
    https://bibliotekanauki.pl/articles/1178042.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Nitinol
    SMA
    electropolishing (EP)
    fatigue resistance
    inclusions
    magnetoelectropolishing (MEP)
    Opis:
    Shape Memory Alloys (SMAs) are a group of intermetallic compounds, which can undergo deformation at one temperature, and then recover their original undeformed shape upon heating above their transformation temperature. Superelasticity occurs just above the alloy’s transformation temperature in a very narrow range. In this case no heating is necessary to cause the deformed shape to recover upon load relieve to its original undeformed shape. It has to be emphasized that nitinol exhibits enormous elasticity when compared with other medical metal alloys. In recent years, the use of nitinol (NiTi), almost equiatomic binary (50:50 ratio) intermetallic compound of nickel and titanium, has been steadily growing, particularly in medical and dental devices markets. However, broader and further application of nitinol has been slowed down by leaking nickel and unavoidable inclusions during producing in this compound. This work is to present some electrochemical treatment methods in view of reducing of both these phenomena. It appears that changing electrical conditions of electropolishing (EP) above the plateau region (EP+) may improve the quality of surface obtained on NiTi of over 60% in comparison with as-received (AR) nitinol part. What’s more, introducing a magnetic field into the electrolysis system results in numerous positive features of nitinol surface and increase of mechanical properties. Thus the magnetoelectropolishing (MEP) process appears to increase higher the fatigue resistance of the treated NiTi part. The experiments carried out on chirurgical needles show an unusual triple (and higher) growth in resistance to bending until fracture. Further increase in fatigue resistance is usually limited by different size inclusions appearing on the nitinol part surface under magnetoelectropolishing (MEP).
    Źródło:
    World Scientific News; 2018, 95; 52-63
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of Nitinol Biomaterial for Medical Applications
    Autorzy:
    Hryniewicz, Tadeusz
    Rokicki, Ryszard
    Powiązania:
    https://bibliotekanauki.pl/articles/1177981.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Nitinol biomaterial
    electropolishing
    fatigue resistance
    magnetoelectropolishing (MEP)
    modification methods
    sterilization
    Opis:
    In the paper, a review of modification methods which have been applied to Nitinol intermetallic compound used as biomaterial for medical applications, is carried out. A variety of methods used for Nitinol improvement, beginning from its manufacture, covers mechanical treatment, heat treatment, chemical processing including water boiling, electropolishing, plasma ion implantation, coating to improve the corrosion resistance, minimize nickel leaching, improve osseointegration, and/or vascular compatibility, sterilization and disinfection. Nitinol alloying by addition of a third element to replace Ti or Ni has an enormous effect on phase transformation, corrosion resistance and biocompatibility of the newly created ternary Nitinol alloy. Unfortunately, the ternary nitinol alloys – apart from NiTiCu in actuators and NiTiCr in wires used as a pulling-pushing tool in minimally invasive spine operation – have not found a widespread industrial application yet. One of the most effective surface finishing operations used for metallic biomaterials, with a special attention directed to Nitinol, appears to be magnetoelectropolishing (MEP). A uniform magnetic field used in MEP process can be generated by permanent magnets or by electromagnets. MEP leads to refinement of surface chemical composition impossible to achieve by standard electropolishing. During MEP of alloys and intermetallic compounds, ferromagnetic elements, such as Fe (from stainless steels) or Ni, are primarily removed from the surface so that the passive film on Nitinol is totally composed of titanium oxide. One more unique feature of metal samples after MEP is their de-hydrogenation noticed both in stainless steels, niobium, titanium and Nitinol. In fact, the fatigue resistance of Nitinol after MEP referred to as-received, dependent on the refinement and displacement of inclusions, increases from three to seven times.
    Źródło:
    World Scientific News; 2018, 96; 35-58
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative corrosion studies of 2205 duplex steel after electropolishing and passivation in Ringer’s solution
    Autorzy:
    Rokosz, Krzysztof
    Hryniewicz, Tadeusz
    Solecki, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/1178066.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    electropolishing
    passivation
    pitting corrosion
    potentiodynamic corrosion measurements
    stainless steel duplex 2205
    Opis:
    In present work, the results of corrosion analysis of pitting and general corrosion of austenitic duplex 2205 (EN 1.4462) stainless steel in Ringer's solution, are presented. The corrosion rate was studied using potentiodynamic polarisation method by means of the ATLAS 98 potentiostat with POL 98 software. For these measurements the platinum EPT-101 and calomel reference EK-101P electrodes were used. For each run, the electrolytic cell made of glass was used, containing up to 500 ml of the electrolyte. The specimens used for the studies were obtained from a cold-rolled sheet of steel in three forms: as received (without any pretreatment), after abrasive polishing, and after electrochemical polishing. Some of them were passivated for 15 and 30 minutes, respectively, in 20% HNO3 by volume. The study results show clearly that the samples of duplex 2205 stainless steels after electropolishing and passivation for 15 minutes in 20% HNO3 by volume revealed the highest corrosion resistance.
    Źródło:
    World Scientific News; 2018, 95; 167-181
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The In-Depth Stress Distribution for 1H13 Specimen after Cutting
    Autorzy:
    Gadalińska, E.
    Wronicz, W.
    Malicki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/97885.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    in-depth stress distribution
    electropolishing
    diffraction methods
    1H13 stainless steel
    Opis:
    Measuring the in-depth stress state is of vital importance for materials scientists. Strain gauges methods are capable of yielding information only about the surface stress state. Diffraction methods using synchrotron or neutron radiation, which allow totally non-destructive stress measurements inside the material, are not widely available. In this context, the best widely available method combines the X-ray diffraction stress measurements and gradual removal of the outer layer by means of electropolishing. Here, this method was applied to the specimen made of 1H13 stainless steel cut with under water on a corundum cut-off wheel. The idea was to investigate how deeply an additional stress state resulting from cutting was introduced and whether the technique of combining of X-ray diffractometry and electropolishing can be used widely for determining the stress state inside the specimen.
    Źródło:
    Fatigue of Aircraft Structures; 2016, 8; 73-79
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The studies of corrosion resistance of AISI 316Ti SS in Ringer’s solution after electropolishing and passivation in nitric acid
    Autorzy:
    Rokosz, Krzysztof
    Hryniewicz, Tadeusz
    Solecki, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/1177846.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    AISI 316Ti/EN 1.4571
    austenitic stainless steel
    electropolishing
    passivation
    pitting corrosion
    potentiodynamic corrosion measurements
    Opis:
    In present work, the continuation of general and pitting corrosion analysis of austenitic AISI 316Ti (EN 1.4571) stainless steel in Ringer's solution, is presented. The corrosion was studied by using the ATLAS 98 potentiostat with platinum EPT-101 and calomel reference EK-101P electrodes. The three types of specimens, i.e. as received (without any pretreatment), after abrasive mechanical polishing (MP), and after electrochemical polishing (EP), were used. The best pitting corrosion resistance was recorded for electropolished and passivated (in 20% vol. HNO3 for 30 minutes) surface, i.e. the pitting potential was equal to 761 mVSCE (855.4 ± 58.5 mVSCE), while the worst one was recorded for mechanically ground samples and the pitting corrosion potential was equal to 270 mVSCE (378.8 ± 60.3 mVSCE).
    Źródło:
    World Scientific News; 2018, 98; 46-60
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the biological response of austenitic stainless steels after electrochemical -EP and MEP- polishing
    Autorzy:
    Hryniewicz, Tadeusz
    Lewicka-Rataj, Katarzyna
    Rokosz, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/1179275.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    austenitic stainless steels
    bacteria Escherichia coli
    electrochemical polishing
    electropolishing EP
    magnetoelectropolishing MEP
    statistical approach
    water contamination
    Opis:
    The austenitic cold-rolled AISI 316L stainless steel was used for the studies. Corrosion resistance measurements were performed on the samples after three types of treatments: abrasive finishing (MP), standard electropolishing (EP), and magnetoelectropolishing (MEP). They were carried out in Ringer's solution at a room temperature, indicating a considerable difference in the breaking potential Epit values, dependent on surface treatment. Two groups of samples, those after EP and MEP, were submerged in broth culture wild strain of Escherichia coli from contaminated river water. Images of the steel samples submerged for 2 and 4 hours are displayed in the paper. A statistical approach has been performed. In each case the number of bacteria deposited on the MEP steel samples was higher in comparison with that one noticed on EP samples, increasing much faster with time on the MEP ones.
    Źródło:
    World Scientific News; 2017, 80; 284-296
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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