Effects of Surface Finishing Procedures on Corrosion Behavior of DMLS-AlSi10Mg_200C Alloy Versus Die-Cast A360.1 Aluminum

Effect of Surface and Subsurface Defects on Fatigue Behavior of AlSi10Mg Alloy Processed by Laser Powder Bed Fusion (L-PBF)

“…Observations of Figures 4 and 7b suggest that the typical surface features of as-built L-PBF samples are replaced in SB specimens by shallower indentation craters of collided particles created during sandblasting. Occasional evidence of fragmented debris of these particles are noticed on the surface (see arrowed fragment in Figure 4b) [28,29]. Cross-sectional profiles (Figure 4c,d) agree with the SEM images exhibiting the waviness as a result of craters and subsurface porosities generated during the sandblasting attributed to the plastic deformation of the surface and closure of the deep valleys in as-built surfaces (see white squared defects in Figure 4c Similar images collected for the SB, VF, and MP specimens are depicted in Figures 4-6, respectively, followed by their height images in Figure 7.…”

Corrosion of Cast Aluminum Alloys: A Review

“…Fathi et al [85] show the highest corrosion resistance of a AlSi10MG direct melting laser sintered compared with a die cast A360.1 aluminum based on surface finish influence using potentiodynamic polarization testing and EIS technique in a marine environment. The results highlighted the improved corrosion resistance of the DMLS-AlSi10Mg_200C compared with its cast counterpart with a similar surface finish, known to be dominated by its finer microstructure, and the ground DMLS-AlSi10Mg surface demonstrated the highest resistance to the selective attack, due to the formation of a stable, dense, and thick passive film.…”

How build angle and post-processing impact roughness and corrosion of additively manufactured 316L stainless steel

“…Several other examples of microstructural features and processing defects that have been investigated are; nanoscale oxides/inclusions 7,20,23,24 , solute segregation (i.e. cell boundaries, melt pool boundaries) 7,13,[22][23][24][25][26][27][28][29] , texture and grain character 29 , residual stresses 3,30,31 , surface roughness 18,20,[32][33][34][35] , and porosity 7,9,[18][19][20][21][22] .…”

“…Another result of the powder-based AM processes is high surface roughness, a major concern for AM part reliability and a characteristic that has received minimal attention with regards to its impact on corrosion. Currently, most of the aforementioned corrosion studies investigate samples in a ground surface condition (planar grinding) with very few addressing how the as-printed AM surfaces impact corrosion behavior 18,20,[32][33][34][35] . The work by Cabrini et al showed a reduction in corrosion resistance and crevice potential for the as-printed surface of the 625 Ni alloy when compared to a polished surface in 0.6 M NaCl solution 18 .…”

“…[68][69][70][71][72][73][74][75][76] • Mechanical surface finishing (planar polishing, tumble polishing, etc.) 20,33,35,40,43,44,[77][78][79][80][81][82] • Chemical polishing 83,84 • Investigating multiple techniques, separate and combined 78,85,86 All techniques showed reductions in surface roughness of the AM parts, yet an issue for many of them is their inability to effectively polish a complex shaped part. Electropolishing presents itself as a sound method to polish complex shapes, with current studies by Urlea et al on building customized cathodes adjacent to an AM part to improve polishing efficiency 64,65 .…”