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Corrosion properties of an aluminium alloy 7000 series after a new two step precipitation hardening

Otpornost prema koroziji aluminijumske legure serije 7000 posle novog dvostepenog termičkog taloženja

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Authors
Jegdić, Bore
Bobić, Biljana
Gligorijević, Bojan
Mišković-Stanković, Vesna
Article (Published version)
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Abstract
Corrosion properties of an aluminium alloy 7000 series were investigated by different electrochemical methods. The alloy was subjected to the one-step and to a new two-step precipitation hardening. Polarization measurements in the 3.5 wt. % NaCl solution have shown a more positive value of the pitting potential (Epit) and a higher corrosion resistance for the two-step aged alloy. The electrochemical impedance spectroscopy (EIS) has also shown that the two-step aged alloy has better corrosion properties (higher value of polarization resistance, Rp, and lower value of double-layer capacitance, Cdl) comparing to the one-step aged alloy.
Otpornost prema koroziji aluminijumske legure serije 7000 ispitivana je primenom različitih elektrohemijskih metoda. Legura je bila podvrgnuta jednostepenom i novom dvostepenom termičkom taloženju. Polarizaciona merenja u 3,5 mas.% NaCl su pokazala da legura posle dvostepenog termičkog taloženja ima pozitivniju vrednost potencijala pitinga (Epit) i veću otpornost prema koroziji. Spektroskopija elektrohemijske impedancije (SEI) je takođe pokazala da legura posle dvostepenog termičkog taloženja ima bolju otpornost prema koroziji (veću vrednost polarizacione otpornosti, Rp i manju vrednost kapacitivnosti dvojnog sloja, Cdl) u poređenju sa legurom posle jednostepenog termičkog taloženja.
Keywords:
aluminium alloys / precipitation hardening / corrosion / electrochemical methods / aluminijumske legure / termičko taloženje / korozija / elektrohemijske metode
Source:
Zaštita materijala, 2014, 55, 4, 387-394
Publisher:
  • Belgrade, Serbia : Engineering Society for Corrosion
Projects:
  • Synthesis, processing and applications of nanostructured multifunctional materials with defined properties (RS-45019)

DOI: 10.5937/ZasMat1404387J

ISSN: 0351-9465

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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/1483
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