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Wyszukujesz frazę "selective corrosion" wg kryterium: Temat

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    Wyświetlanie 1-4 z 4
    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:
    Corrosion Behaviour of Low-Alloyed Cast Steel in Diverse State
    Autorzy:
    Kondracki, M.
    Studnicki, A.
    Szajnar, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/382317.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    low alloyed cast steel
    heat treatment
    pitting corrosion
    selective corrosion
    staliwo niskostopowe
    obróbka cieplna
    korozja wżerowa
    korozja selektywna
    Opis:
    In the paper the results and analysis of corrosion tests were presented for low-alloyed cast steel in as-cast state and after heat treatment operations. Such alloys are applied for heavy loaded parts manufacturing, especially for mining industry. The corrosion test were performed in conditions of high salinity, similar to those occurring during the coal mining. The results have shown, that small changes in chemical composition and the heat treatment influence significantly the corrosion behaviour of studied low-alloyed cast steels.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1; 25-28
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations of corrosion behaviour of SnSb12Cu6Pb alloy in 0.1M H2SO4 and 0.5M NaCl solution
    Autorzy:
    Hrabia-Wiśnios, J.
    Leszczyńska-Madej, B.
    Kowalik, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/368272.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    Tin-based bearing alloys
    corrosion behaviour
    passivation film
    selective corrosion
    microstructure
    stopy łożyskowe
    zachowanie korozyjne
    korozja selektywna
    mikrostruktura
    Opis:
    Purpose: The results presented the microstructure and corrosive behavior of SnSb12Cu6Pb alloy (B82) in H2SO4 aqueous solution and NaCl aqueous solution. Design/methodology/approach: The electrochemical corrosion has been investigated in two different aqueous solutions: 0.1M sulfuric acid (H2SO4) and 0.5M sodium chloride (NaCl) solution measuring of potential changes relative to immersion time and conducting mass loss test. Microscopic investigations before and after corrosion tests were made using scanning electron microscopy. Findings: The obtained results indicate very good corrosion resistance of the alloy tested in NaCl solution. Corrosion progresses faster in a sulfuric acid aqueous solution compared to sodium chloride aqueous solution. Also, it was found that the dominant mechanism of corrosion degradation in both solutions is selective corrosion which is a particularly undesirable type of corrosion because it involves the loss of one alloying component and the formation of porous structure on the alloy surface. Research limitations/implications: The aqueous solutions used in this study are not a natural working environment of the bearing. However, a comparison of acidic and neutral solutions allows explaining the corrosion behavior of tin babbitts due to contaminants of oil lubricants. Further research should be conducted in more aggressive environments characteristic of industrial conditions. Practical implications: One of the important properties of bearing alloys are corrosion resistance. Corrosion properties are extremely important for the transport and storage of metallic components before they are used. Also, the working environment can have a destructive effect on the properties of the materials used. Industry environment, aging stagnant oil, and some acids may lead to selective corrosion of the tin, copper, lead, or antimony components and leaving a rough and weakened the babbitt surface. Electrochemical corrosion can contribute to the acceleration of bearing wear and consequent to bearing damage. Originality/value: Studies of the corrosion of tin-babbitt bearings are not extensive in the literature due to rare tin corrosion. This study could be an important complement to knowledge about the corrosion behavior of tin-based bearing alloys.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2020, 101, 1; 5-14
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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