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Corrosion Resistance of Aluminum Alloy 7020-T6 in Sea Water | ||
| Engineering and Technology Journal | ||
| Article 1, Volume 29, Issue 8, 2011, Pages 1482-1490 PDF (1.73 M) | ||
| DOI: 10.30684/ etj.29.8.4 | ||
| Author | ||
| Mustafa Khaleel Ismael | ||
| Abstract | ||
| The present work is aimed to investigate the effect of heat treatment on corrosion resistance of Al-alloy 7020-T6 in sea water, the specimens which manufactured by (1.5*1.5*0.2) cm, according to ASTM (G31-72) [1] The heat treatment was carried out at 480°C and water quench after that artificial aging are implemented at temperature 150°C for (1, 4) hours. Microstructure and phase properties after heat treatment and corrosion test were investigated by optical microscope; X-ray diffraction and computer potentiodynamic polarization technique have been used to study corrosion behavior in 3.5% NaCl. The results of corrosion resistance 7020-T6 decrease by solution heat treatment and, increase the holding time from 1- 4 hour would increase the corrosion rate, Intermetallics compounds containing zinc represent as the sacrificial anode and control pitting corrosion in 7020-T6 alloy also, the artificial ageing time increase the precipitation of zinc and decrease pitting corrosion at 1 hour. | ||
| Keywords | ||
| Alloy; corrosion resistance; Potentiodynamic; Microstructure; artificial aging; Heat treatment | ||
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