Corrosion performance and degradation mechanism of a bi-metallic aluminum structure processed by wire-arc additive manufacturing

Abstract An Al-5Mg alloy (AA5083) block, deposited over an AA6061 substrate by wire-arc additive manufacturing, was electrochemically tested along two different cross-sectional planes cyclic polarization in 3.5 wt.% NaCl. The layers and the interlayer boundaries showed similar behavior regardless of direction. corrosion both mainly attributed to presence relatively coarse intermetallic Al(Fe, Mn)Si particles. In substrate, governed deep crevices interfaces directionally aligned particles with Al matrix. pitting around numerous and/or Mn, Cr, Ti)Si at boundaries, which were much finer compared those substrate. abundance fine precipitates their intergranular location caused surface material removal, more extensive boundaries. perpendicular z-y z-x block did not show significant differences anodic behavior. Differences distinct case cathodic polarization. Some anisotropy noted through thickness plane that complies obtained tensile