Purpose: The main task of this work was to define the optimum heat treatment parameters so as to received the alloys resistant for stress corrosion cracking, within the limits of the corrosion factor, i.e. artificial sea water. Design/methodology/approach: The mechanical properties were evaluated by tensile tests. The corrosion tests (in corrosion environment and inert-glycerol) were carried out on the device, making possibility extension of the samples with constant speed until break. Another investigations: SEM, light microscopy and TEM. Findings: The researches included structural analyse, mechanical and corrosion investigations, which allow to define the optimum parameters (quenching at 560 degrees centigrade temperature, in water, artificial ageing at temperature 160 degrees centigrade/12 h) so as to received the alloys resistant for stress corrosion cracking. Research/limitations/implications: Conducted investigations layout the areas of later researches, a specially in the direction of the possible, next optimization tests of their structure, e.g. in the range of raising resistance on corrosion cracking in chosen media. Practical implications: The range of possible uses the regard also increases from this, as materials on working constructions in the investigated aggressive environment. Originality/value: Contributes to research on corrosion protection for aluminium and its alloys.