The effect of temperature and strain rate on the stress corrosion cracking behavior of Al-Zn-Mg alloy was studied by measuring the fracture energy ratio at slow strain rate varing $7.58\times10^{-6} sec^{-1}$, $1.58\times10^{-6} sec^{-1}$, $7.58\times10^{-7} sec^{-1}$, at the same time, electrochemical corrosion potential and corrosion rate were measured by means of potentiostatic method with ageing conditions and cold working in the aqueous solution containing, 3.5% NaCl (pH=1.0).
The results of this study were as follows;
1. Corrosion potential increased and corrosion rate decreased with ageing time and there may be attributed to the decreasement of the anodic area in the grain boundary.
2. The resistance of stress corrosion cracking was increased as the temperature was decreased, as the strain rate and ageing time were increased.
3. The upper limit of the strain rate in which the stress corrosion effect was observed was $7.58\times10^{-6} sec^{-1}$ in the peak aged and over aged conditions tested in 3.5% NaCl Sol. (pH=1.0 at 30℃).
4. The resistance of stress corrosion cracking was varied with corrosion resistance.
5. The apparant activation energy obtained in the present work be tabulated as;
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