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

Authors

  • Biljana Bobić University of Belgrade, Institute of Chemistry, Technology and Metallurgy - IChTM, Serbia Author
  • Stanković Vesna Mišković University of Belgrade, Faculty of Technology and Metallurgy, Serbia Author

DOI:

https://doi.org/10.5937/ZasMat1404387J

Keywords:

aluminium alloys, precipitation hardening, corrosion, electrochemical methods

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.

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Published

15-12-2014

Issue

Vol. 55 No. 4 (2014)

Section

Articles