© 2016 Curran Associates Inc. All rights reserved.Copper additions to aluminium alloys increase strength significantly. The tensile properties reach up to 450 MPa that is found to be suitable for aerospace applications. However, it is typically reported that Cu decreases corrosion resistance of aluminium castings. On the other hand, there are no detailed works in the literature about how the corrosion rate of these type of alloys is. Therefore, in this work the aim was targeted to evaluate the electrochemical behaviour of A206 and A380 aluminium alloys as a function of microstructure. Sand and die moulds were used to produce cast parts so that different microstructures would be obtained. Tafel diagrams were plotted to compare the corrosion behaviour of both alloys.