CORROSION BEHAVIOR OF THE Al-Zn-Mg-Cu ALLOYS WITH NICKEL ADDITIONS

In this research, comparative study of corrosion resistance of aluminum based alloys and Al-alloys with nickel have been investigated. Several processes are conducted for the AlZn-Mg-Cu alloys and Al-Zn-Mg-Cu-0.5%Ni alloys were homogenized, aged then retrogressed and reaged; also, alloys were homogenized then the extruded thereafter heat treated. Al-Zn-Mg-Cu alloy and AlZn-Mg-Cu-Ni alloy samples after different treatments were subjected to corrosive media (acidic: 1.0M HCl) using weight loss method to evaluate their corrosion resistance. The consequences present that the precipitation for the base alloy samples treated led to enhance their resistance of corrosion. Furthermore, the gain of corrosion resistance for the Al-Zn-Mg-Cu-Ni alloy samples after the RRA treatment and thermomechanical with the RRA about of 52 and 75 %, respectively, more than what the Al-Zn-Mg-Cu alloy‎ samples under same conditions. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) were used to show the corroded surfaces.