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    Wyświetlanie 1-8 z 8
    Tytuł:
    Kinetics of Corrosion Process in H2SO4 and HNO3 Aqueous Solutions of Lead Free Sn-Ag-Cu Solder Alloys
    Autorzy:
    Guśpiel, J.
    Wierzbicka-Miernik, A.
    Reczyński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/352914.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electronic materials
    polarization
    acid corrosion
    Opis:
    This paper presents the results of the corrosion resistance of Sn-Ag-Cu alloys in air-saturated aqueous solutions containing NO3-, SO42- ions, whose concentration was equivalent to their contents in acid rains and in concentrations 10 - 100 times higher. The Ag, Cu and Sn concentrations in the corrosive media were determined using the Atomic Absorption Spectrometry. The specific dissolution rate and corrosion current were derived using the a rotating disc technique. The corrosion rate of Sn- Ag-Cu alloys depends on pH of the examined solutions and on the concentration of oxygen near the phase boundary. In the whole range of concentrations of the applied H2SO4 + HNO3 mixtures of acids, the pure Sn was more corrosion resistant than eutectic alloy as well as the near eutectic one, following the sequence: Sn>Sn3.66Ag0.91Cu>3.8Ag0.7Cu.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 559-568
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selective Corrosion of Al2Cu Intermetallic Phase in Orthophosphoric Acid Aqueous Solutions
    Autorzy:
    Kwolek, P.
    Gradzik, A.
    Szeliga, D.
    Kościelniak, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/351947.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    intermetallic phase
    selective corrosion
    orthophosphoric acid
    electrochemical impedance spectroscopy
    Opis:
    Al2Cu phase has been obtained by melting pure metals in the electric arc furnace. It has been found that the intermetallic phase undergoes selective corrosion in the H3PO4 aqueous solutions. Aluminium is dissolved, the surface becomes porous and enriched with copper. The corrosion rate equals to 371 ±17 g∙m-2∙day-1 (aerated solution) and 284 ± 9 g∙m-2∙day-1 (deaerated solution). The surface of Al2Cu phase after selective corrosion was characterised by using electrochemical impedance spectroscopy. It was found that the surface area of the specimens increases with temperature due to higher corrosion rate and is between 2137 and 3896 cm2.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 4; 1223-1229
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Na3VO4 Inhibitor on the Corrosion Resistance of Al2Cu Intermetallic Phase in H3PO4 Aqueous Solution
    Autorzy:
    Kwolek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/354857.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    intermetallic phase
    selective corrosion
    orthophosphoric acid
    electrochemical impedance spectroscopy
    sodium orthovanadate
    Opis:
    Sodium orthovanadate was tested as a corrosion inhibitor of intermetallic Al2Cu in 1 M H3PO4. The Al2Cu–H3PO4–Na3VO4system was studied using the following methods: inductively coupled plasma optical emission spectrometry, scanning electron microscopy with energy dispersive x-ray spectroscopy, x-ray diffraction, electrochemical impedance spectroscopy, polarisation and open circuit potential. It was found that the corrosion rate decreased as the inhibitor concentration increased. The highest inhibition efficiency 99% was obtained when sodium orthovanadate initial concentration was equal to 100 mM, pH = 1.11, due to precipitation of a protective layer of insoluble salt, containing vanadium, phosphorus, sodium and oxygen, on the surface. At pH = 0.76 the protective layer was not formed and inhibition efficiency decreased to 76%. Selective corrosion of the intermetallic phase caused a significant increase of an electric double layer capacitance and decrease of a charge transfer resistance.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 1; 175-183
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the Effect of Environmental Factors on the Corrosion of Water Distribution System Based on Analysis of On-line Corrosion Monitoring Results
    Autorzy:
    Jażdżewska, A.
    Gruszka, M.
    Mazur, R.
    Orlikowski, J.
    Banaś, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/355721.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    water distribution system
    acid rain
    corrosion monitoring
    online
    linear polarization method
    Opis:
    Corrosion of water distribution system is a significant issue causing problems with quality, safety and continuity of distribution. The changes of corrosion rates of the water distribution systems in Cracow made of carbon steel were investigated by analysis of online corrosion monitoring system results. Corrosion rates were determined using the linear polarization method. The impactof rain, temperatures, conductivity, dissolved oxygen content on corrosion rate were characterized. The corrosivity of different water sources like mountain water, underground water or river water were indicated. The possible actions for reducing corrosion losses were characterized. Results show that pollution of the environment in the form of acid rain and runoff from agriculture as well as the type of the source water has significant influence on corrosion of water distribution system. Corrosion monitoring system gives possibility of controlling corrosion rate by mixing waters from different sources in the way to obtain less corrosive mixture. (see Fig 8).
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 1; 109-116
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dew point of the flue gas of boilers co-firing biomass with coal
    Autorzy:
    Ciukaj, S.
    Pronobis, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/185075.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acid dew point
    low-temperature corrosion
    biomass
    co-firing
    korozja
    biomasa
    współspalanie
    Opis:
    The paper deals with the impact of co-firing biomass with coal in boilers on the dew point of the flue gas. Co-firing of biomass may have twofold implications on corrosion and fouling, which are the processes that determine the lowest acceptable flue gas outlet temperature and as a result, boiler efficiency. Both phenomena may be reduced by co-firing of usually low sulphur biomasses or enhanced due to increased moisture content of biomass leading to increased water dew point. The present study concerns the problem of low-temperature corrosion in utility boilers. The paper gives (in the form of diagrams and equations) a relationship between water dew point and moisture content of fuel mixture when co-firing coal and various biomasses. The regression analysis shows that despite significant differences in the characteristics of coals and these of additional fuels, which are planned for co-firing in large-scale power boilers, the water dew point can be described by a function given with the accuracy, which shall be satisfactory for engineering purposes. The discussion of the properties of biofuels indicates that the acid dew point surplus over the water dew point ([delta]tr = tr -twr) is not likely to exceed 10 K when co-firing biomass. The concluding remarks give recommendations for the appropriate operation of boilers in order to reduce risks associated with biomass co-combustion.
    Źródło:
    Chemical and Process Engineering; 2013, 34, 1; 101-108
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of corrosion behaviour in acid environment of binary Mg-Li alloys for plastic forming
    Autorzy:
    Białobrzeski, A.
    Saja, K.
    Żmudzińska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380235.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ultralight Mg-Li alloy
    corrosion behaviour
    acid media
    stop ultralekki Mg-Li
    zachowanie korozyjne
    środowisko kwaśne
    Opis:
    The article discusses studies and corrosion tests of binary Mg-Li alloys for plastic forming examined in an acid medium (5% HCl solution) for the time of 0-144 hours. In short it can be stated that corrosion of the examined Mg-Li alloys in 5% HCl solution proceeded in a similar mode in all the studied alloys, regardless of the lithium content.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 3 spec.; 25-28
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corrosion behaviour of binary Mg-Li alloys for plastic forming
    Autorzy:
    Białobrzeski, A.
    Saja, K.
    Żmudzińska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380767.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ultralight Mg-Li alloy
    alkaline corrosion
    acid media
    stop ultralekki Mg-Li
    korozja alkaliczna
    środowisko kwaśne
    Opis:
    The paper outlines the course of corrosion processes in magnesium and Mg-Li alloys. The methodology of corrosion studies of alloys for plastic forming and their chemical composition as well as micrographs of alloys intended for research are presented.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 3 spec.; 15-20
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ fluorków i kwasu mlekowego na odporność korozyjną stopów tytanu w symulowanym roztworze sztucznej śliny
    Influence of Fluoride and Lactic Acid to Corrosion Resistance of Titanium Alloys in Simulated Artificial Saliva Solution
    Autorzy:
    Loch, J.
    Krawiec, H.
    Łukaszczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382532.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    stop tytanu
    odporność korozyjna
    sztuczna ślina
    kwas mlekowy
    fluorek sodu
    titanium alloy
    corrosion resistance
    artificial saliva
    lactic acid
    Opis:
    Ze względu na powszechne wykorzystanie stopów tytanu w stomatologii, w pracy podjęto badania elektrochemiczne stopów tytanu: Ti-10Mo-4Zr i Ti-6Al-4V, których celem było określenie właściwości korozyjnych podczas ekspozycji w fizjologicznym roztworze sztucznej śliny, w temperaturze 37 °C, pH = 8,0 i swobodnym dostępie tlenu, a następnie modyfikacji roztworu poprzez dodatek kwasu mlekowego oraz fluorku sodu. Odporność korozyjną obu stopów porównano na podstawie badań potencjału korozyjnego i potencjodynamicznych krzywych polaryzacyjnych wykonanych techniką liniowej woltamperometrii (LSV).
    Titanium alloys are used in medicine and dentistry due to perfect combination of their high strength, corrosion resistance and biocompatibility. Currently, titanium alloys are among the most attractive metallic materials used to manufacture such implants as artificial hip joints, knee joints, intervertebral discs, screws securing the fracture. Most kinds of screws used in dentistry for basic fixing of ceramic dental prostheses are made from titanium alloys. Widespread use of titanium alloys in dentistry is the reason for electrochemical research on two titanium alloys: Ti-6Al-4V and Ti-10Mo-4Zr. The aim of the research was to determine the corrosion when the alloy is exposed to physiological artificial saliva solution at the temperature of 37 °C, pH = 8.0 and in aerated solution and modification of saliva solution: added lactic acid and sodium fluoride.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 4 spec.; 87-90
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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