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    Wyświetlanie 1-8 z 8
    Tytuł:
    Influence of seawater salinity on corrosion of hull structural steel
    Autorzy:
    Zagożdżon, Paweł
    Starosta, Robert
    Powiązania:
    https://bibliotekanauki.pl/articles/241977.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    hull structural steel
    corrosion
    potentiodynamic test
    seawater
    Opis:
    Hulls of ships are often made of steel, which are produced under the supervision of classification societies. Usually, the hull steel of ordinary strength category A is used for the ship's shell (the yield strength is 235 MPa and the impact strength 27 J at 20ºC). Vessels sail in sea areas with various levels of salinity and thus with different corrosiveness. The average salinity of the seas is taken as 3.5% content of sodium chloride. This article presents the results of corrosion tests of S235 JRG1 steel in an aqueous solution in which the mass fraction of sodium chloride was: 0.7%, 1.4%, 2.2%, 2.8%, 3.5% and 4.2%. Corrosion tests were performed using the potentiodynamic method. As parameters characterizing the corrosion properties of the tested steel, the corrosion current density and corrosion potential were assumed. Statistically significant influence of seawater salinity on the corrosion properties of hull structural steel of ordinary strength of category A was found. The highest value of the corrosion current density was observed in the solution containing 3.5% NaCl mass fraction was observed. In seawater with a sodium chloride content in the range of 0.7 to 3.5%, an increase in the value of the corrosion current density was observed, along with the increasing share of NaCl. In seawater with higher salinity, the corrosion rate was reduced. The corrosion potential of S235JRG1 steel decreases with the NaCl content in the corrosive solution. The susceptibility of this material to corrosion in seawater increased.
    Źródło:
    Journal of KONES; 2019, 26, 2; 189-195
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of finishing on the corrosion properties of flame sprayed Ni-5%Al and Ni-5%Al-Al2O3 coatings
    Autorzy:
    Charchalis, A.
    Starosta, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/247338.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    flame spraying
    composite coating
    Ni-Al
    burnishing
    corrosion
    potentiodynamic test
    EIS test
    Opis:
    The Ni-5%Al alloy and Ni-5% Al-Al2O3 composite coatings were obtained by a flame spraying method, “Casto- Dyn DS 8000” torch was used. The coatings onto a substrate made of austenitic stainless steel (X5CrNi18-10) were sprayed. The coatings were subjected to turning, burnishing and grinding. The evaluation of corrosion properties were based on the measurements of direct current (potentiodynamic method) and the alternating current (EIS method). Corrosion tests were performed in a 3.5% sodium chloride solution. On the basis of studies, the effect of finishing type on the corrosion properties of flame sprayed coatings has been demonstrated. The lowest corrosion current density was found for Ni-5%Al coatings after burnishing, icorr value equal to 0.76 μA/cm2, and the charge transfer resistance was 31063 Ω/cm2. The lowest resistance to corrosion of grinded Ni-5%Al-Al2O3 composite coatings was observed. These coatings were characterized by the following parameters of corrosion process: icorr = 14.01 μA/cm2, Rct = 3260 Ω/cm2. Burnishing caused increased corrosion resistance of both coatings. Due to reduced roughness and waviness are obtained reduction of the area of the actual burnished coatings compared to turned coatings. Thus, it is resulting in reduced values of corrosion current density. After finishing treatment, the thermally sprayed Ni-5%Al-15%Al2O3 coatings characterized by lower corrosion resistance compared to the alloy coating. The presence of the reinforcing phase in the coating promotes the increase of the porosity. Burnishing does not cause a significant change in porosity of the coating. The flame sprayed coatings on nickel-based have a tendency to localized corrosion in seawater environment.
    Źródło:
    Journal of KONES; 2014, 21, 4; 29-36
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of temperature on corrosion resistance of austenitic stainless steel in cl¯ containing solutions
    Autorzy:
    Zatkalíková, Viera
    Markovičová, Lenka
    Powiązania:
    https://bibliotekanauki.pl/articles/111992.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    pitting corrosion
    temperature
    cyclic potentiodynamic test
    immersion test
    pitting potential
    korozja wżerowa
    temperatura
    test potencjodynamiczny
    Opis:
    Temperature is considered a complicated external factor of the susceptibility of stainless steels to the pitting. This paper deals with the corrosion behaviour of AISI 316Ti stainless steel in temperature range 22 - 80°C in aggressive chloride environments (3 and 5% FeCl3 solutions). The corrosion resistance of tested steel is evaluated on the base of results of exposure immersion tests and cyclic potentiodynamic tests. According to the obtained results the resistance of AISI 316Ti to the pitting is markedly affected by temperature changes in the range 22 - 80°C. Intensity of corrosion attack increases with the rise of Cl¯ concentration. Gentle changes of temperature and Cl¯ concentration cause significant differences in character of local damage. The appearance of pitted surfaces changes with the rise of the temperature (a density of pitting increases, a size of pits decreases). The strongest change in appearance is observed between 40 and 50ºC.
    Źródło:
    Production Engineering Archives; 2019, 25; 43-46
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrochemical Corrosion of Magnesium Alloy AZ31 with Additive Lithium
    Autorzy:
    Przondziono, J.
    Hadasik, E.
    Szala, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/353288.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnesium alloy AZ31 with additive of 4.5% Li
    electrochemical corrosion in NaCl
    potentiodynamic test
    immersion test
    SEM
    Opis:
    The purpose of performed tests was evaluation of resistance to electrochemical corrosion of extruded magnesium alloy AZ31 with additive of 4.5% Li. Corrosion tests were performed in 0.01-2.0 M NaCl solutions. Potentiodynamic tests enabled to register polarisation curves. With application of stereoscopic microscope Nikon SMZ745T and electron scanning microscope Hitachi S-4200, the surface of the alloy was observed after immersion tests performed in 1-6 days. Results of performed tests prove explicitly deterioration of corrosion properties of the alloy with the increase of molar concentration of NaCl solution. It can be seen that corrosion process is intensive and that intensity increases with the increase of solution concentration and extension of exposure time.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2359-2363
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corrosion properties of 1.4512 ferritic and 1.4404 austenitic steels for the automotive industry
    Autorzy:
    Zatkalíková, Viera
    Markovičová, Lenka
    Wróbel-Knysak, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/88716.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    corrosion
    ferritic stainless steel
    austenitic stainless steel
    cyclic potentiodynamic test
    exposure test
    stal ferrytyczna odporna na korozję
    stal austenityczna
    test potencjodynamiczny
    test ekspozycji
    Opis:
    Exhaust systems are susceptible to in-service wear because of their exposition to the very aggressive corrosive environment. Various stainless steels grades (mostly ferritic and austenitic, but also martensitic and duplex) and protective coatings are currently used for exhaust system elements to increase their aestetics and corrosion resistance. This article focuses on evaluation and comparison of the common corrosion properties of two stainless steels with different microstructures (ferritic and austenitic) used for exhaust system components at the low ambient temperature (35 °C). An aggressive acidic corrosion solution for electrochemical cyclic potentiodynamic tests (ASTM G61) was chosen to simulate partly inner (condensate) and also external environment (reaction of exhaust gases with water, chlorides in solution after winter road maintenance). Exposure tests of the pitting corrosion resistance were performed according to ASTM G48 standard method.
    Źródło:
    System Safety : Human - Technical Facility - Environment; 2019, 1, 1; 745-752
    2657-5450
    Pojawia się w:
    System Safety : Human - Technical Facility - Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corrosion Damage Mechanisms of TiO2 Cold-Sprayed Coatings
    Autorzy:
    Lachowicz, Marzena
    Winnicki, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/2125544.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    titanium dioxide
    cold-sprayed coatings
    potentiodynamic polarization test
    aluminum alloys
    structural steel
    Opis:
    Cold spraying as a low-temperature coating deposition method is intended for thermally sensitive materials. Due to its precise temperature control, it limits the formation of structural defects, and can therefore be easily applied to spray corrosion protective coatings made from metal or metal-ceramic powders. However, the formation of pure ceramic coatings with the use of cold spraying is still not so common. Titanium dioxide is one of the most interesting ceramics due to its photocatalytic properties. Nevertheless, these types of coating materials usually work in a corrosion favoring humid atmosphere. In the presented paper, amorphous TiO2 powder was deposited onto aluminum alloys and steel substrates and then submitted to potentiodynamic corrosion tests in a 3.5 wt.% NaCl solution. The as-sprayed coating showed phase transition from amorphous TiO2 to anatase, and also revealed porosity. As a result, electrolytes penetrated the coating and caused undercoating corrosion in the tested environment of an aqueous NaCl solution. The analysis of the potentiodynamic curves showed that the presence of the coating decreased corrosion potential on both substrates. It arose from the mixed phases of TiO2, which consisted of photocathode - amorphous material and photoanode - crystalline anatase. The phase mixture induced the galvanic corrosion of metallic substrates in the presence of electrolytes. Moreover, pitting-like corrosion and coating delamination were detected in aluminium alloy and steel samples, respectively. Finally, the corrosion mechanism of the titanium dioxide coatings was characterized and described.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 975--985
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Local corrosion of AISI 304 stainless steel in acidic chloride solution
    Autorzy:
    Zatkalíková, Viera
    Markovičová, Lenka
    Hanusová, Patrícia
    Powiązania:
    https://bibliotekanauki.pl/articles/104041.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    austenitic stainless steel
    pitting corrosion
    exposure test
    cyclic potentiodynamic test
    direction of rolling
    austenityczna stal nierdzewna
    korozja wżerowa
    próba narażenia
    cykliczna próba potencjodynamiczna
    kierunek walcowania
    Opis:
    AISI 304 austenitic stainless steel is recommended and used for various applications in industry, architecture and medicine. Presence of halides in environment evokes a possibility of the local corrosion which limits seriously exploitation of this material in aggressive conditions. The presented paper is focused on the pitting corrosion resistance (“as received” steel surface) in 1M chloride solution (pH=1.2) at a common (20 °C) and an elevated (50 °C) ambient temperatures. 24-hours exposure immersion test (ASTM G48) and cyclic potentiodynamic test (ASTM G61) are used as the independent test methods. The exposure immersion test is carried out with cross-rolled and longitudinally rolled specimens and the effect of direction of rolling on the resistance to pitting is studied.
    Źródło:
    Quality Production Improvement - QPI; 2019, 1, 1; 268-275
    2657-8603
    Pojawia się w:
    Quality Production Improvement - QPI
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badania własności elektrochemicznych stentów wieńcowych
    Evaluation of electrochemical properties of coronary stents
    Autorzy:
    Hyla, A.
    Walke, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/99235.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Śląska. Katedra Biomechatroniki
    Tematy:
    stent wieńcowy
    stal Cr-Ni-Mo
    badanie potencjodynamiczne
    EIS
    odporność na korozję
    coronary stent
    Cr-Ni-Mo steel
    potentiodynamic test
    corrosion resistance
    Opis:
    W pracy przeprowadzono ocenę właściwości elektrochemicznych stentu wieńcowego wykonanego ze stali austenitycznej Cr-Ni-Mo. W celu zasymulowania warunków występujących w środowisku naczyń krwionośnych człowieka badania przeprowadzono w sztucznym osoczu w temperaturze T = 37 ± 1°C i pH = 7,0 ± 0,2. Badania odporności korozyjnej przeprowadzono w oparciu o rejestrację krzywych polaryzacji anodowej oraz metodę Sterna. Dla oceny zjawisk zachodzących na powierzchni badanego stentu zastosowano również metodę elektrochemicznej spektroskopii impedancyjnej (EIS – Electrochemical Impedance Spectroscopy). Analizie poddano stenty przed i po procesie rozprężenia. W celach porównawczych badania wykonano również dla próbek pobranych ze stali Cr-Ni-Mo w stanie przesyconym o właściwościach mechanicznych odpowiadających stali wykorzystanej do produkcji stentów.
    The study includes the evaluation of electrochemical properties of coronary stent made of Cr-Ni-Mo austenitic stainless steel. In order to simulate the conditions found in the human vascular environment studies were carried out in the artificial plasma at a temperature of T = 37 ± 1°C and pH = 7.0 ± 0.2. Corrosion resistance tests were carried out on the basis of registration of the anodic polarization curves and the method of Stern. In order to assess developments on the surface of a stent the method of electrochemical impedance spectroscopy was used. Stents were analyzed before and after expansion. For comparative purposes, tests were also performed to samples of the Cr-Ni-Mo in the supersaturated state of the corresponding mechanical properties of steel used for the production of stents.
    Źródło:
    Aktualne Problemy Biomechaniki; 2013, 7; 75-80
    1898-763X
    Pojawia się w:
    Aktualne Problemy Biomechaniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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