In an integrated process where forming and welding of the aluminium alloy EN AW-7075 is involved, it is necessary to perform proper heat treatment in order to achieve optimal mechanical properties and corrosion behaviour. Within ALLEGRO, various annealing temperatures and times, quench environment, welding processes and the influence of those variations on the corrosion behaviour after artificial aging were investigated in the subproject B3. Corrosion tests were performed according to DIN EN ISO 11846:2008-08 in order study the resistance of the resulting microstructures against intergranular corrosion. Electrochemical analyses and immersion tests using a 0.1 % NaCl aqueous solution were carried out to assess active or passive corrosion behaviour of the aluminium alloy. The interim results show a tendency of decreasing corrosion depth of aged samples with increasing holding time at higher annealing temperature. In addition to lower corrosion depth, a more uniform corrosion was observed for those samples after testing against intergranular corrosion. Open circuit potential tests confirmed a trend towards more noble free corrosion potential of aged samples with longer annealing time and higher temperature. It can be concluded that a longer solution annealing time leads to a more homogeneous microstructure that results in more evenly distributed intermetallic phases after aging. Therefore, a longer holding time with a higher annealing temperature is preferred in order to enhance the corrosion behaviour of the alloy EN AW-7075, and at the same time reducing its sensibility to intergranular corrosion.