Pitting and intergranular corrosion of Scalmalloy® aluminium alloy additively manufactured by Selective Laser Melting (SLM)

Localized corrosion of Scalmalloy® processed by Selective Laser Melting (SLM) under certified conditions is \nstudied and correlated with the intermetallic particles present in the microstructure. Two types of samples are \nconsidered: as-built and heat-treated samples. The heat treatment does not modify the pitting corrosion per- \nformance. All samples exhibit two groups of pits with different repassivation behaviour. Si-bearing and Fe- \nbearing phases produce pitting, while Al(Sc,Zr) is not found to be important. The two types of samples are \nresistant to intergranular corrosion (IGC) according to ASTM G67 thanks to the low content of β phase. However, \nthe heat-treatment slightly increases the IGC-susceptibility.