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EIS research of AW - 7020 alloy joints welded by MIG

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Języki publikacji
EN
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EN
The results of corrosion properties research of aluminum alloy AW 7020 (AlZn5Mg1) welded by MIG were presented. In the article the parameters for MIG welding of sheets made of AlZn5Mg1 (7020) alloy was presented. Metallographic analysis of bonds showed a proper structural construction MIG welded 7020 aluminum alloy. EIS measurement was performed in three electrode system in artificial seawater (3.5% NaCl). Impedance studies were carried out at the corrosion potential. Changed voltage signal amplitude in the range plus or minus 10 mV and frequency range of changes was as follows: 100 kHz - 0.1 Hz. Atlas 0531 EU and IA potentiostat was used for studies. Model in the form of an electrical equivalent circuit replacement was chosen for the test object. The results of electrochemical impedance spectroscopy are presented graphically in the Nyquist charts matched with the theoretical curve to them and in the form of parameters characterizing the corrosion process. Obtained results were statistically analyzed. Much better resistance to electrochemical corrosion was found for the native material then joint welded by MIG of 7020 aluminum alloy. The most important parameter - charge transfer resistance value of a double layer Rct for sample of native material is higher than for the sample welded by MIG. Original value is received results of the corrosion properties of MIG welded AlZn5Mg1 alloy compared with the native material.
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autor
  • Gdynia Maritime University, Faculty of Marine Engineering Morska Street 81-87, 81-225 Gdynia, Poland tel.:+48 58 690 15 49, +48 58 690 13 47, fax: +4858 6901399, kdudzik@am.gdynia.pl
Bibliografia
  • [1] Czechowski, M., Effect of anodic polarization on stress corrosion cracking of some aluminium alloys, Advances in Materials Science, Vol. 7, pp. 13-20, No. 1(11), 2007.
  • [2] Czechowski, M., Low-cycle fatigue of friction stir welded Al-Mg alloys, Journal of Materials Processing Technology, 164-165, 1001-1006, 2005.
  • [3] Czechowski, M., Własności złączy doczołowych blach ze stopów Al-Mg spajanych różnymi metodami, Materiały i Technologie, Politechnika Gdańska, Nr 1(1) 2003, Gdańsk 2003.
  • [4] Czechowski, M., Zieliński, A., Effect of cathodic polarization on failure and degradation of mechanical properties of some aluminium alloys, Scripta Metallurgy Materials, Vol. 30, 1994.
  • [5] Dudzik, K., Czechowski, M., Analysis of possible shipbuilding application of Friction Stir Welding (FSW) method to joining elements made of AlZn5Mg1 alloy, Polish Maritime Research, No. 4, 2009.
  • [6] Dyl, T., Starosta, R., Effect of the ceramic dispersion in the nickel matrix composite coatings on corrosion properties after plastic working, Solid State Phenomena, Vol. 183, 2012.
  • [7] Starosta, R., Corrosion of Ni-Al and Ni-Al-Al2O3 flame sprayed coatings of Casto-Dyn 8000 system in 0.01 M H2SO4 and 3.5% NaCl solution, Solid State Phenomena, Vol. 183, 2012.
  • [8] Starosta, R., The influence of plastic strain on the corrosive properties of plasma sprayed intermetallic NiAl and NI3Al coatings, Solid State Phenomena, Vol. 165, pp. 165-177, 2010.
  • [9] Starosta, R., Zieliński, A., Effect of chemical composition on corrosion and wear behaviour of the composite Ni-Fe-Al2O3 coating, Journal of Materials Processing Technology, No. 157-158, 2004.
  • [10] Xiao, Y. P., Pan, Q. L., Li, W. B., Liu, X. Y., He, Y. B., Influence of retrogression and reaging treatment on corrosion behaviour of Al-Zn-Mg-Cu alloy, Materials and Design 32, China 2011.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BUJ8-0018-0010
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