Additive Friction Stir Deposition (AFSD) technology is gaining attention for its ability to produce large aluminium alloy components without melting. To ensure alignment with the goal of reducing energy consumption, and considering the difficulty of performing post-heat treatment for such large-scale components, post-process treatment should be avoided. This study explores the use of a solid solution-hardened Al-Mg alloy enhanced with slow-diffusing elements, Scandium and Zirconium. Both Al-Mg and Al-Mg-Sc-Zr alloys were printed using AFSD with various rotational speeds (rpm). Initial heat treatment was performed on Al-Mg-Sc-Zr alloys to form Al3(Sc, Zr) dispersoids. EBSD analyses showed that the grain size in Al-Mg alloy remained constant for the different process parameters, while the Al-Mg-Sc-Zr alloy exhibited grain growth with increased rpm. Atom Probe Tomography and Transmission Electron Microscopy indicated that this growth was attributed to the dissolution of Al3(Sc, Zr) dispersoids at higher rotational rates. Moreover, corrosion tests were conducted to determine the influence of AFSD on the sensitization resistance of these alloys after ageing. While AFSD enhances the corrosion resistance of the Al-Mg alloy, the Al-Mg-Sc-Zr alloy shows minimal change at low rpm but increased susceptibility to intergranular corrosion at higher rotational rates. This study highlights the potential for optimizing AFSD parameters to prevent Al3(Sc, Zr) dissolution and to improve sensitization resistance of Al-Mg alloys, offering insights for future alloy design tailored for AFSD technology.