AlSi10Mg

Table 1 summarizes, in a comparative way, the main results from potentiodynamic polarization tests obtained for AlSi10Mg. While some works report a similar corrosion current density for cast and AM AlSi10Mg [32,51,61], others claim a higher value for the cast alloy compared to the additively manufactured specimen [44,59,60]. Besides, while some studies show a similar value of corrosion potential for cast and AM AlSi10Mg [32,61], others report a nobler value of corrosion potential for AM AlSi10Mg in comparison with its cast counterpart [44,59,60]. On the contrary, Kubacki et al. [51] measured a lower value of corrosion potential for the additively manufactured material compared to the cast alloy. Nevertheless, the AM material presented a much higher value of pitting potential and a much wider passive region than the cast alloy [51].

**Table 1.** Comparison between Cast and as-built AM AlSi10Mg from results obtained in potentiodynamic polarization tests. Only results acquired in polished/ground samples were considered. Ecorr, Icorr, and Epit refer to corrosion potential, corrosion current density, and pitting potential, respectively.


While the corrosion attack in AM AlSi10Mg is mainly localized along the melt pool borders [32,33,44–57], the corrosion of the cast alloy is characterized by a severe localized corrosion of the α-Al matrix in the periphery of the large Si precipitates, as well as around the Mg2Si and Fe-containing intermetallics [32,44,51]. In general, several researchers claim that the corrosion resistance of additively manufactured AlSi10Mg is higher than that of the cast alloy of approximately the same chemical composition [44,60,61]. Girelli et al. [59] and Leon et al. [61] found a slightly lower mass loss during corrosion in aerated 3.5 wt.% NaCl for the AM specimen compared to the cast alloy. However, Kubacki et al. [51] concluded that while both the cast and AM AlSi10Mg presented similar surface damage and median corrosion depth after immersion in a modified G85-A2 (cyclic acidified salt fog/spray test) cycle, the additively manufactured material presented a greater maximum damage depth compared to the cast alloy.
