TY - JOUR
ID -
TI - The Susceptibility of 7020 Al-alloys to Pitting Corrosion at Various Heating Temperatures
AU - Karim M. Ali
AU - Entsar N.Farhan
AU - Sami I. J. Al-Rubaiey
PY - 2010
VL - 14
IS - 61
SP - 33
EP - 46
JO - journal of the college of basic education مجلة كلية التربية الاساسية
SN - 18157467 27068536
AB -
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.
ER -