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The Susceptibility of 7020 Al-alloys to Pitting Corrosion at Various Heating Temperatures | ||
| journal of the college of basic education | ||
| Article 1, Volume 14, Issue 61, 2010, Pages 33-46 | ||
| Authors | ||
| Karim M. Ali; Entsar N.Farhan; Sami I. J. Al-Rubaiey | ||
| Abstract | ||
| The present work is aimed to investigate the effect of heat treatments variables ( temperature & time holding) on the tendency of high strength Al-alloys type 7020. The experiments were carried out by heating the specimens at different temperatures (100, 150, 200, 250, 300, 350, 400, 450 and 500 °C) for two periods of holding time, one and two hours. Polarization technique was used to study the effects of microstructures on their electrochemical behavior in 3.5 % NaCl solution. Microscopic & X- ray examination had been used to reveal pitting corrosion on the microstructure of non heated and heated 7020 Al-alloys .The results refer to as temperatures of heat treatment increase from 100-500°C pitting corrosion appears on the precipitated phases.Pitting corrosion tendency increase with increasing temperature of heating. Increase time holding of heat treatment from 1 hr. to 2 hrs would increase the pitting corrosion. | ||
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